VARDHAMAN COLLEGE OF ENGINEERING · working of leaky bucket algorithm with a neat diagram. 7M b) Consider the following subnet diagram, here the distance vector routing is used and

Hall Ticket No: Question Paper Code : A1515

VARDHAMAN COLLEGE OF ENGINEERING

(AUTONOMOUS) B. Tech VI Semester Regular/Supplementary Examinations, May - 2015

(Regulations: VCE-R11) COMPUTER NETWORKS

(Electronics and Communication Engineering) Date: 26 May, 2015 Time: 3 hours Max Marks: 75

Answer ONE question from each Unit All Questions Carry Equal Marks

Unit – I

1. a) What is OSI reference model? Discuss the principles that were applied to arrive at the seven layers.

10M

b) Compare the delay in sending an x-bit message over a k-hop path in a circuit-switched network and in a (lightly loaded) packet-switched network. The circuit setup time is s sec, the propagation delay is d sec per hop, the packet size is p bits, and the data rate is b bps. Under what conditions does the packet network have a lower delay?

5M

2. a) Explain the structure of the telephone system and also show how a typical circuit routes for a medium distance call made with a help of neat diagram.

6M

b) Which is better, ADSL or cable? Justify your answer. 9M

Unit – II

3. a) Describe the advantage of framing with the help of neat diagram, explain byte or character stuffing.

7M

b) What is the main principle involved in sliding window protocol? Explain Go Back-N ARQ protocol with the help of neat diagram.

8M

4. a) Explain different kinds of Ethernet Cabling with a neat diagram.

7M b) Imagine that you are writing the data link layer software for a line used to send data to

you, but not from you. The other end uses HDLC, with a 3-bit sequence number and a window size of seven frames. You would like to buffer as many out-of-sequence frames as possible to enhance efficiency, but you are not allowed to modify the software on the sending side. Is it possible to have a receiver window greater than 1, and still guarantee that the protocol will never fail? If so, what is the largest window that can be safely used?

8M

Unit – III

5. a) What are the different techniques for achieving good quality of service? Explain the working of leaky bucket algorithm with a neat diagram.

7M

b) Consider the following subnet diagram, here the distance vector routing is used and the following vectors have just come in to router C: from B (5,0,8,12,6,2); from D(16,12,6,0,9,10); and from E: (7,6,3,9,0,4). The measured delays to B, D and E are 6, 3, and 5 respectively. What is C’s new routing table? Give both the outgoing line to use and the expected delay.

Cont…2

8M

::2::

6. a) How does congestion control done in virtual circuit subnets? Explain with a neat diagram. 8M b) What is fragmentation? Explain the different types of fragmentation with neat diagrams. 7M

Unit – IV

7. a) Imagine that a two-way handshake rather than a three-way handshake were used to set up connections. In other words, the third message was not required. Are deadlocks now possible? Give an example or show that none exist.

7M

b) A client sends a 128-byte request to a server located 100 km away over a 1-gigabit optical fiber. Compute the minimum possible response time both for the given 1-Gbps line and for a 1-Mbps line. What conclusion can you draw?

8M

8. a) Both UDP and TCP use port numbers to identify the destination entity when delivering a message. Give three reasons for why these protocols invented a new abstract ID (port numbers), instead of using process IDs, which already existed when these protocols were designed.

9M

b) Explain briefly TCP connection establishment phase.

6M

Unit – V 9. a) Discuss basic functions supported by email. 8M b) Bring out the significance of Telnet.

7M 10. a) Write a short note on the following application layer protocols:

i. File transfer protocol ii. Simple Mail transfer protocol

9M

b) Write a program in Java script that accepts and integer greater than two and tells whether it is a prime number. Note that Java script has % operator if and while statements with the same syntax as C and Java. If you need the square root of x, use Math. sqrt (x).

6M




(Regulations: VCE-R11) EMBEDDED SYSTEMS

(Common to Computer Science and Engineering & Information Technology) Date: 26 May, 2015 Time: 3 hours Max Marks: 75


Unit - I 1. a) What are the constraints that we have to consider to design a real time embedded

processor that would gain the optimal performance with high confidence? 8M

b) List the important microprocessors used in embedded system and explain any two methods used to meet the design in embedded system.

7M

2. a) Illustrate the use of UML to model the systems, with the help of model train controller. 7M b) Briefly explain the types of relationship that can exist between objects and classes. 8M

Unit – II

3. a) Write an assembly language program to copy a block of 8 bytes of data to RAM locations starting at 50H from RAM locations 30H.

7M

b) With an example, explain the data transfer and logical instructions in 8051 microcontroller.

8M

4. a) What are the addressing modes of 8051? Explain each with examples. 7M b) With an example, explain the jump and call instructions in 8051 microcontroller. 8M

Unit – III 5. a) List and explain different types of memory management techniques in real time operating

systems. 7M

b) List the different ways to protect the shared data and what is an event. Mention the three standard features of an event.

8M

6. a) Explain the significant factors to reduce memory and power consumption in RTOS. 8M b) Differentiate between hard real time system and soft real time system. 7M

Unit – IV 7. a) Illustrate the goals of Typical testing process in target environment. 7M b) Explain the process of building application software with native tools.

8M 8. a) What is the basic method used for testing embedded software on the development host

system? Explain in brief. 7M

b) Discuss ROM emulators, In circuit emulators and PROM programmer. 8M

Unit – V 9. a) Give the difference between Von Neumann and Harvard architecture, RISC and CISC. 7M b) With an example, explain the different types of addressing modes in ARM processor?

8M 10. a) Differentiate between the advanced architectures ARM and SHARC features. 7M b) Write a short note on any two network embedded system protocols. 8M




(Regulations: VCE-R11) INDUSTRIAL MANAGEMENT AND PSYCHOLOGY

(Common to Electrical and Electronics Engineering, Mechanical Engineering & Civil Engineering) Date: 26 May, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) Write the milestones giving time line pertaining to the evolution of management theory. 8M b) What are the demerits of scientific management theory?

7M

2. a) What is line organization and list out their advantages? 8M b) Describe Product Departmentation and mention its advantages and limitations.

7M

Unit – II

3. a) Discuss the general factors an entrepreneur will look into while setting up his business venture.

8M

b) In a welding shop, a direct time study was done on a welding operation. One inexperienced industrial engineer and one experienced industrial engineer conducted the study simultaneously. They agreed precisely on cycle time (shown below) but their opinion on rating the worker differed. The experienced engineer rated the worker 100 percent and the other engineer rated the worker 120 percent. They used a 0.10 percent allowance fraction.

Cycle Time (in minutes) Number of Times Observed 20 2 24 1 29 1 32 1

From the above statement, i. Determine the standard time using the experienced industrial engineer's worker

rating. ii. Find the standard time using the worker rating of inexperienced industrial engineer. iii. Comment on the reliability of time study engineers.

7M

4. a) What are principles of motion economy? List the various principle with respect to arrangement of work place.

10M

b) An activity consisting of 3 elements is timed using cumulative timing method. The stop watch reading along with performance rating is given in the following table. Compute the standard time using allowance of 10%.

Element No. Watch reading (Min) Rating 1 0.9 110 2 1.9 100 3 2.4 105

5M

Cont…2

:: 2 ::

Unit – III 5. The list of activities with the precedence requirement, normal cost and time, crash cost and

time are as shown in the Table.

Activity Precedence Normal time (Days)

Normal cost (Days)

Crash time (Days)

Crash cost (Days)

A ___ 4 300 2 450 B A 9 600 5 960 C A 6 620 4 750 D B 4 320 3 395 E B 6 1440 3 1980 F C, D 4 350 2 470 G E,F 3 270 2 335

i. Draw the project network. ii. What is the normal duration and corresponding cost of the project? iii. How many days will be saved and what will be the cost, if all the activities are crashed to

the maximum possible extent. Indirect cost is Rs. 375/- per day.

15M

6. a) List and Explain the salient features of clauses 5 through 8 of ISO 9001:2008 QMS. 5M b) A machine is producing a product to a specification of 12.58±0.05mm. A study of 10

groups of 5 each shows the following measurements.

1 2 3 4 5 6 7 8 9 10 12.62 12.63 12.62 12.61 12.59 12.57 12.57 12.58 12.61 12.56 12.60 12.56 12.56 12.66 12.58 12.63 12.56 12.57 12.60 12.55 12.62 12.60 12.57 12.62 12.57 12.60 12.61 12.60 12.62 12.62 12.61 12.59 12.58 12.61 12.59 12.59 12.59 12.62 12.60 12.60 12.65 12.60 12.63 12.60 12.56 12.60 12.60 12.60 12.65 12.54

i. Determine the control limits for X and R charts and plot the points ii. Determine the process capability iii. Does the process meet the give specification requirements?

10M

Unit – IV

7. a) Discuss the various parameters that need to be considered while making purchase decision.

8M

b) What is inventory? Justify the need for keeping inventories.

7M

8. a) Wage differential refers to the difference between wages in different industries or different states for the same job or position. Discuss. Support your answer with suitable examples.

7M

b) Define marketing management. Distinguish between marketing and selling concept.

8M

Unit – V

9. a) Explain Maslow’s hierarchy of needs theory and Herberg’s two factor theory of motivation.

10M

b) What is morale? Explain the factors that affect the morale of employees.

5M

10. a) What is industrial fatigue and its effects? 7M b) Define industrial psychology and identify its scope. How is it different from personal

management? 8M




(Regulations: VCE-R11) CONTROL SYSTEMS

(Aeronautical Engineering) Date: 26 May, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) Give a Block diagram representation of AC Servomotor. 8M b) Write the Differential equations for the Mechanical System.

7M

2. a) Derive the transfer function and hence write the block diagram for DC Servomotors. 7M b) For the given rotational system in Fig.1, obtain the electrical analogous systems based on

inverse and direct analogous methods.

Fig.1

8M

Unit – II

3.

a) Reduce the given block diagram in Fig.2 to its simple form and hence obtain the equivalent transfer function C(S)/R(S).

Fig.2

8M

b) Find the Transfer function of the system whose signal flow graph is given in Fig.3 below.

Fig.3

Cont…2

7M

:: 2 ::

4. a) Reduce the Block diagram in Fig.4 and obtain the Transfer function C(s)/R(s).

Fig.4

8M

b) Find C(s)/R(s) for the Signal flow graph shown in the fig.5.

Fig.5

7M

Unit – III

5.

a) The open loop transfer function of a feedback control system is )1(

)(

Tss

KsGH . Find

by what factor the gain K is reduced so that the overshoot is reduced from 75% to 25%.

7M

b) The open loop TF of a negative feedback control system is 25.4

.)()( 2

ssSKsHsG .

Draw the root locus indicating all the salient points.

8M

6. a) The closed loop transfer function of a second order system is given by

2

100( )10 100

T sS S

, Determine the damping ratio, natural frequency of oscillations,

rise time, settling time and peak overshoot.

8M

b) Using R-H Criterion, Determine the stability of a system whose characteristic equation is given by 2S5 +S4 +6 S3 +S+ 1=0.

7M

Unit – IV

7. a) Draw the lead compensator electrical networks and obtain its transfer function. 6M

b) Design a phase lag compensator so the system )1(

100)()(

Ss

sHsG will have a phase

margin of 15°.

9M

8. a) Write the block diagram of a PID controller, Explain why it is preferred. 8M b) Draw the lag compensator electrical network and obtain its transfer function.

Cont…3

7M

:: 3 ::

Unit – V

9. a) Define controllability and observability. 6M b) Find out the state equations of the circuits given in Fig.6. Choose Vc and iL as state

variables.

Fig.6

9M

10. a) List atleast six properties of state transition matrix. Write six advantages of state variables analysis.

6M

b) A system has the following governing differential equation )(452

2

tuxdt

xd . Convert

it into state space form and show the states making use of partial fractions.

9M




(Regulations: VCE-R11) NETWORK SECURITY AND CRYPTOGRAPHY

(Computer Science and Engineering) Date: 28 May, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) Define computer security? What are the three main objectives of computer security? Explain.

8M

b) What is the purpose of OSI Security Architecture? Explain the Security Architecture for OSI.

7M

2. a) Encrypt the message “SECURITY” using Hill cipher technique with key.

3 28 5

8M

b) How stenography differs from cryptography? Explain different stenographic forms and list merits and demerits of stenography.

7M

Unit – II

3. a) Explain encryption and decryption operations with triple DES and describe the possible attack on Triple DES.

7M

b) Consider the following Encryption and Decryption Tables for Substitution Cipher with n=4 inputs. Draw the 4-bit Block Substitution.

Plaintext Cipher text Cipher text Plaintext 0000 1110 0000 1110 0001 0100 0001 0011 0010 1101 0010 0100 0011 0001 0011 1000 0100 0010 0100 0001 0101 1111 0101 1100 0110 1011 0110 1010 0111 1000 0111 1111 1000 0011 1000 0111 1001 1010 1001 1101 1010 0110 1010 1001 1011 1100 1011 0110 1100 0101 1100 1011 1101 1001 1101 0010 1110 0000 1110 0000 1111 0111 1111 0101

Cont…2

8M

:: 2 ::

4. a) Consider the following table, apply the DES Algorithm and generate the cipher text for the given plaintext and key.

Plaintext: 02468aceeca86420 Key: 0f1571c947d9e859

7M

b) State and prove Fermat’s theorem. Using Fermat’s theorem 5241 mod 13.

8M

Unit – III

5. a) List the requirements of digital signature. Explain the concept of direct digital signature along with the possible threats and remedies.

8M

b) Explain the working of HMAC algorithm with a neat diagram.

7M

6. a) Along with the key-exchange protocol, explain Diffie-Hellman key computation technique. Show how this protocol is vulnerable to Man-in-the-Middle attack.

10M

b) How public key cryptosystem is used to provide both confidentiality and authentication? Explain along with a relevant diagram.

5M

Unit – IV

7. a) What does the following notations stands for? Ks, PRa, PUa, EP, DP, EC, DC, H, ||, Z, R64

8M

b) With necessary diagrams, explain the basic services provided by the PGP.

7M

8. a) What are the problems and limitations of the use of Simple Mail Transfer Protocol that are addresses by Multipurpose Internet Mail Extension?

8M

b) Explain Oakley key determination protocol used in IPSec and list the features of Oakley algorithm.

7M

Unit – V

9. a) What does Handshake protocol do during its first phase? Explain the operations performed in brief.

8M

b) What are the design goals of firewalls? Give the limitation of them.

7M

10. a) What is the purpose of dual signatures in SET? Explain the construction of a dual signature with the help of a diagram.

8M

b) What is the use of expanding secrets using pseudorandom function in TLS? Explain the process with diagram.

7M




(Regulations: VCE-R11) WIRELESS AND MOBILE COMPUTING

(Information Technology) Date: 28 May, 2015 Time: 3 hours Max Marks: 75


Unit - I 1. a) With a neat diagram, explain the different types of satellite orbit. 8M b) Considered as an interworking unit in a communication network, what function can a

satellite have?

7M

2. a) What are the general advantages and disadvantages of WLANs compared to their wired counterparts?

7M

b) Explain the Architecture of an infrastructure-based IEEE 802.11. 8M

Unit – II 3. a) Explain GSM network architecture in detail. 7M b) Describe TDMA by mobile stations in cell i, j using same radio communication channel in

different time slots.

8M

4. a) Give the Comparison of SDMA & TDMA mechanisms. 7M b) With necessary diagrams, explain how MAC Protocol can avoid exposed and hidden

terminal problem? 8M

Unit – III 5. a) Compare AODV, TORA, CGSR and Flat routing table driven protocol. 8M b) Why is timeout freezing required in case of mobile node? What are the modifications

made in data link and TCP layers to enforce timeout freezing.

7M

6. a) What are the functions of HA and FA in the mobile IP protocol? How does an agent discover COA when a mobile station node visits foreign network?

8M

b) Explain any four properties, applications and security in MANETs. 7M

Unit – IV 7. a) Describe pull-based data delivery mechanism. What are the advantages and

disadvantages of pull based data delivery? 7M

b) Explain the n-tier client server architecture.

8M

8. a) What do you mean by context? What are the different context types used in context aware computing?

8M

b) Explain some alternatives to the use of indexing. 7M

Unit – V 9. a) Explain WTLS in detail. 7M b) Draw Master-Slave architecture in a piconet of Bluetooth device and also explain the

states in which a Bluetooth device can be found.

8M

10. a) What are the requirements that must be satisfied while designing the Wireless Application Protocol in WAP forum?

7M

b) Explain the architecture of Wireless Application Protocol. 8M




(Regulations: VCE-R11) MICROPROCESSORS AND INTERFACING

(Common to Electronics and Communication Engineering & Electrical and Electronics Engineering)

Date: 28 May, 2015 Time: 3 hours Max Marks: 75


Unit - I 1. a) List the features of 8086 microprocessor. 7M b) With a neat diagram, explain the flag register of 8086 microprocessor.

8M

2. a) Explain the general purpose registers in 8086 microprocessor. 7M b) Draw the read and write cycle timing diagram of 8086 microprocessor. 8M

Unit – II 3. a) Explain the following instructions with examples:

i. XLAT ii. NEG iii. IDIV iv. CMP

7M

b) Write a program to find the largest number from a given unordered array of 8 bit data, stored in location LIST.

8M

4. a) Write a program for the addition of a series of 8 bit numbers. The series contains 100 (numbers).

7M

b) What is the function of assembler directives? Briefly explain any five such directives. 8M

Unit – III 5. a) Draw the interface of two 4K X 8 EPROMs and two 4K X 8 RAM chips with 8086

microprocessor. 7M

b) Find the memory address specified by the following segment and offset: i. CS=1000H and IP=2000H ii. CS=2000H and IP=1000H iii. CS=2300H and IP=1A00H iv. CS=3456H and IP=ABCDH

8M

6. a) Explain the various modes of operation of 8255 and its interfacing to 8086 microprocessor.

7M

b) With a neat diagram, explain the concept of seven segment LED display. 8M

Unit – IV 7. a) Draw the block diagram of 8259 and explain the initialization sequence of the same. 7M b) Explain in brief different modes of operation of 8254.

Cont…2

8M

::2::

8. a) Briefly describe the conditions which cause the 8086 to perform each of the following types of interrupts: Type 0 to Type 4.

7M

b) Explain the interfacing and refreshing of DRAM in the IBM PC. 8M

Unit – V 9. a) List the salient features of 80386. 7M b) Explain RS 432A serial data standard.

8M

10. a) Explain the concept of memory segmentation in 80286 microprocessor. 7M b) Differentiate between synchronous and asynchronous data transfer with examples. 8M




(Regulations: VCE-R11) PRODUCTION PLANNING AND CONTROL

(Mechanical Engineering) Date: 28 May, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) Explain functions of production Planning and Control. 10M b) Explain two types of continuous production system.

5M

2. a) Explain Delphi method of forecasting. 5M b) Sales forecast for ABC company for past 10years has been compared:

Year 1 2 3 4 5 6 7 8 9 10 Annual Sales (‘000 units) 1000 1300 1800 2000 2000 2000 2200 2600 2900 3200

Make forecast for next 3years.

10M

Unit – II

3. a) Explain the Routing procedures in practice. 10M b) An automobile assembly unit has demand of 100 petrol tanks per week The purchase

rate is 2000/- per unit The inventory carrying cost is Rs.35/- per unit per year. The ordering cost is Rs.1500/- per order. Find EOQ.

5M

4. a) Explain characteristics of JIT system. 5M b) Ten items kept in inventory are listed below. Which items should be classified as ‘A’

items, ‘B’ items and ‘C’ items?

Item 1 2 3 4 5 6 7 8 9 10 Annual Usage 200 100 2000 400 6000 1200 120 2000 1000 80 Value per Unit (Rs) 40 360 0.20 20 0.04 0.80 100 0.7 1 400

10M

Unit – III

5. a) Explain the following terminologies used in line balancing i. Cycle time ii. Balance efficiency

5M

b) The following list defines the precedence relationships and element times for a new model toy:

Element Te (Min) Immediate predecessors 1 0.5 - 2 0.3 1 3 0.8 1 4 0.2 2 5 0.1 2 6 0.6 3 7 0.4 4, 5 8 0.5 3, 5 9 0.3 7, 8

10 0.6 6, 9 i. Construct the precedence diagram for this job ii. If the ideal cycle time is to be one minute, what is the minimum number of

stations required to minimize the balance delay Cont…2

10M

::2::

6. a) Explain different aggregate planning strategies. 10M b) Demand forecast is given in the following table :

Period Q Demand forecast Supply capacity (units)

Regular time Overtime Subcontract 1 600 975 225 150 2 1050 975 225 150 3 1600 975 225 150

Initial inventory =0, ending inventory =200; Unit production cost (Regular) = Rs 5000/- Overtime production cost / unit = Rs 8000/- Subcontracting cost / unit = Rs 12000/- Back ordering not allowed. Inventory carrying cost = Rs 100/ unit/ period Formulate the transportation matrix for the above problem.

5M

Unit – IV

7. a) Explain different scheduling methods. 5M b) Consider the following flow shop scheduling problem. Using Johnson’s algorithm, obtain

the optimal sequence which will minimize the makespan. Draw Gantt chart

Job, i 1 2 3 4 5 6 Machine -1 5 2 13 10 8 12 Machine-2 4 3 14 1 9 11

10M

8.

a)

Sequence the jobs given below for following priority rules.

Job A B C D E Processing time (in days) 4 17 14 9 11 Due date (counted from today) 6 20 18 12 12

i. FCFS, ii. EDD, iii. SPT, iv. LPT, v. LS.

5M

b) The time spent on processing 2 jobs on 6 machines are as follows: Job I : A-20, C-10, D-10, B-30, E-25, F-15 Job II : A-10,C-30, B-15, D-10, F-15, E-20 Use graphical method to minimize the time needed to process the jobs.

10M

Unit – V

9. a) State the basic problems of Scheduling. 5M b) Explain Production Scheduling for fluctuating demand.

10M 10. Write short notes on

i. Application of Computers in Planning and control ii. Activities of Dispatcher iii. Types of Follow ups.

15M




(Regulations: VCE-R11) FINITE ELEMENT MODELING AND ANALYSIS



Unit – I

1. a) With example explain principle of minimum potential energy. 3M b) Write the difference between Macro and Micro mechanical models. Define and explain

nodal degrees of freedom.

12M

2. a) With example explain natural coordinate scheme. 5M b) Explain node numbering method, and show how to reduce the size of banded matrix.

10M

Unit – II

3. a) Explain Global, local and natural coordinate systems. 5M b) Derive the element stiffness matrix for 1-D bar element.

10M

4. a) What is plane stress and plain strain problems? 5M b) Derive the shape function for a 4 noded quadrilateral element using Lagrange’s

methods.

10M

Unit – III

5. a) What are iso parametric, sub parametric and super parametric elements. 8M b) Prove that in two noded bar element used for solving problem of a rod subjected to axial

loads, the strains are expected to be most accurate at the midpoint of the element.

7M

6. a) What are Isoparametric representation and write the advantages of it. 5M b) Derive strain matrix, Jacobian matrix for CST element.

10M

Unit – IV

7. a) Explain Gauss elimination method algorithm. 8M

b) Compare the values of I = dxxx )2

cos(1

1

2

using two point Gauss quadrature.

7M

8. a) Explain one point formula in numerical integration. 8M

b) Compute 1

2

1

132

e d

using 2 point formula.

7M

Unit – V

9. a) Explain pre processor, processor and post processor with respect to commercial package. 7M b) Explain axisymmetric problems with example of 2D elements.

8M

10. a) With flow chart explain pre-processor, solver and post processor. 8M b) Explain symmetry boundary condition for fractional models in analysis. 7M




(Regulations: VCE-R11) DESIGN OF STEEL STRUCTURES

(Civil Engineering) Date: 28 May, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) What are the advantages and disadvantages of steel structures? 8M b) Classify the steel structures based on the load transfer.

7M

2. a) List the important mechanical properties of steel along with the factors that influence them.

8M

b) Briefly explain the various structural stability checks considered by the IS code.

7M

Unit – II

3. a) Explain briefly various types of loads to be considered in design of steel structures. 7M b) Determine the design tensile strength of the plate (200 X 10 mm) with the holes as

shown in Fig.1 below, if the yield strength and the ultimate strength of the steel used are 250 MPa and 420 MPa and 20 mm diameter bolts are used. fy = 250 MPa fu = 420 MPa

Fig.1

8M

4. a) Explain the different modes of failure of tension members. 7M b) A single unequal angle 100x 75x 8 mm is connected to a 12 mm thick gusset plate at the

ends with 6 nos as shown in Fig.2 below. 20 mm diameter bolts to transfer tension. Determine the design tensile strength of the angle. (a) if the gusset is connected to the 100 mm leg

8M

Fig.2 Cont…2

:: 2 ::

Unit – III

5. Design a column to support a factored load of 1050kN. The column has an effective length of 7 m with respect to Z - axis and 5 m with respect to Y – axis. Use steel of grade Fe410.

15M

6. a) Write short notes on the following: i. Web crippling ii. Web buckling iii. Laterally supported beams iv. Laterally unsupported beams

8M

b) Determine the plastic section modulus about the strong and weak axes for ISMC 200 at 216.81 N/m shown in Fig.3.

7M

Fig.3

Unit – IV

7. a) Draw the neat sketch of the roof truss with labeling the parts of it. 7M b) A roof truss shed is to be built in Lucknow for an industry. The size of shed is 24mX4m.

The height of building is 12m at the eves. Determine the basic wind pressure.

8M

8. Design a suitable single angle purlin having AC sheets as covering with spacing of trusses is 4.5 m, pitch of the truss is 1 in 5 with spacing of the purlins = 1.6 m, wind pressure normal to the roof is 1.3 kN/m2, span of the truss = 18 m.

15M

Unit – V

9. a) State advantages and disadvantages of plate girders over trusses. 8M b) Explain the various types of stiffeners.

7M

10. Design a load carrying stiffener for a load of 550 kN for the section ISLB shown in Fig.4.

15M

Fig.4




(Regulations: VCE-R11) COMPUTER METHODS IN POWER SYSTEMS

(Electrical and Electronics Engineering) Date: 30 May, 2015 Time: 3 hours Max Marks: 75


Unit - I 1. a) Derive the expression for Ybus using inspection method by taking an example of a

two bus power system. 6M

b) Obtain the Ybus by inspection method for the power system shown in the Fig.1 below: The impedances of the lines are mentioned in per unit. The rectances are in per unit. The half-line charging admittances are negligible.

Fig.1

9M

2. a) Write the algorithm for obtaining the off-diagonal elements of Zbus when a link is added to a partial network using Zbus building algorithm.

10M

b) What are the special cases when a link is added to a reference node and when there is no mutual coupling?

5M

Unit - II 3. a) Explain how the buses are classified in conducting load flow studies on a power system

and explain the significance of slack bus. 8M

b) Derive the static load flow equations for the calculation of voltage at any bus during any iteration to carryout load flow studies and explain the use of acceleration factors.

7M

4. a) What is the data required to conduct load flow analysis on a power system. 3M b) The system data for a load flow solution are given in tables 4.1 and 4.2. Determine the

voltages at the end of first iteration using Gauss-Siedal iterative method. Assume acceleration factor = 1.6:

Table 4.1 (Line Data) Table 4.2 (Bus Data) Bus

Code Line admittance

(P.U.) Bus

Code Pin P.U.

Q in P.U.

Voltage Type of Bus

1-2 (2-j8) 1 - - 1.0600 slack

1-3 (1-j4) 2 0.5 0.2 1.000 PQ

2-3 (0.666-j2.664) 3 0.4 0.3 1.000 PQ

2-4 (1-j4) 4 0.3 0.1 1.000 PQ

3-4 (2-j8)

12M

Cont…2

::2::

Unit III 5. a) Explain the terms correction vector, mismatch vector and Jacobian matrix by

taking an example of a 4 bus system, where only one PV bus is present. 6M

b) Find the mismatch vector using NR method for the power system having only one PQ bus and a generator bus with voltage 1.02 pu. The load is 0.4+0.5j pu at the load bus and the reactance of the lines connecting the two buses is 0.5j. Calculate only for 1st iteration.

9M

6. a) By taking an example of a three bus system with only PQ buses, explain the algorithm for NR method of load flow solution.

5M

b) A generator supplies a load through a short line of as shown in Fig.2 given below. If there is a 3 phase short circuit at the load terminals, then calculate the fault current.

Fig.2

10M

Unit - IV 7. a) Define symmetrical components of a set of 3 phase unbalanced voltages. Obtain the

matrix equation for a set of 3 phase unbalanced voltages in terms of symmetrical components.

6M

b) Derive the expression for the fault current where a double line to ground fault occurs at the terminals of an unloaded synchronous generator. Draw the connection diagram of sequence networks.

9M

8. a) Derive the expression for the power output of a non salient pole synchronous generator connected to synchronous motor through a transmission line. Draw the power angle curve and make comments on the curve.

10M

b) Explain the methods to improve steady state stability of a power system. 5M

Unit - V 9. a) What is the significance of equal area criteria in power system? In which way does it

help a power system engineer? 5M

b) The pre-fault, during fault and post fault steady state stability limits are 1.5, 0.8 and 1.2 pu. The electrical power delivered before fault is 0.8pu. Calculate the critical clearing angle.

10M

10. a) Derive the swing equation. 5M b) A 50 MVA, 50Hz, 2 pole synchronous machine has inertia constant of 4MJ/MVA. Find the

kinetic energy stored in the rotor at synchronous speed and the angular acceleration if the electrical power developed is 450MW when the input less the rotational losses is 575MW.

10M




(Regulations: VCE-R11) DIGITAL COMMUNICATIONS

(Electronics and Communication Engineering) Date: 30 May, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) Explain the following terms with reference to PCM and bring out the importance of the same. i. Quantization ii. Synchronization iii. Regenerative repeaters

9M

b) A 10KHz baseband channel is used by digital transmission system. Ideal pulses are sent at Nyquist rate and the pulse takes 16 levels. What is the bit rate of system? If suppose we wish to transmit at a rate of 64kbps over a 3KHz telephone channel. Work out SNR for this.

6M

2. a) Describe DM system and its advantages over DPCM. What are two types of errors encountered in DM? Illustrate with a diagram.

12M

b) An analog signal with maximum frequency 3KHz is to be sent over PCM with 16 level quantizer. i. Find number of bits per sample ii. Bit rate of the system.

3M

Unit – II

3. a) With neat diagram, explain how coherent BFSK wave can be generated and detected. Write its constellation diagram.

8M

b) Consider S(t) shown in the Fig.1 below:

Fig.1

Determine the impulse response of a filter matched to this signal and sketch it as a function of time Plot matched filter output.

7M

4. a) Explain DPSK transmitter and receiver structure. 8M b) The binary sequence 1100100010 is applied to DPSK transmitter

i. Sketch DPSK transmitted wave form. ii. In the absence of noise, is it possible to reconstruct the original sequence justify.

7M

Cont…2

:: 2 ::

Unit – III

5. a) Consider a source of 3 symbols with probabilities ½, ¼ , ¼ Calculate the self-information carried by each symbol and entropy of the source.

5M

b) Given a binary channel shown in Fig.2.

Fig.2

i. Find the channel matrix of the channel.

ii. Find channel capacity when 12( )3

P x and 21( )3

P x .

iii. Find the joint entropy H(x,y) .

10M

6. a) Apply Huffman coding procedure for the following set of messages and determine the efficiency of the binary code so formed. x1=0.7, x2= 0.15, x3=0.15.if the same technique is applied to the 2nd order extension for the above messages, how much will the efficiency be improved?

10M

b) Consider a source = S1, S2 with probabilities 3/4 and 1/4 respectively obtain the Shannon-Fano for 2nd extensions of the code.

5M

Unit – IV

7. a) For a systematic (6,3 ) linear code, the parity matrix P is given by

1 0 10 1 11 1 0

P

find all possible code-vectors

6M

b) The parity check bits of a (8, 4) block code are generated by c5= d1+d2+d4 c6= d1+d2+d3 c7=d1+d3+d4 c8=d2+d3+d4 where d1 d2 d3 and d4 are the message bits

i. Find the generator matrix and parity check matrix for this code ii. Find the minimum weight of this code

9M

8.

a) if 4( ) 1f x x x , then show that 2 2( )f x f x in modulo 2 algebra.

5M

b) For a (7, 4) cyclic code, the received vector Z(x) is 1110101 and the generator polynomial is 31g x x x . Draw the syndrome calculation circuit and correct the single error assuming (3rd bit is in error) in the received vector. Repeat the procedure to find the error in the received vector 0100101.

10M

Unit – V

9. a) Write a short note on Viterbi algorithm 4M b) Consider the (3,1,2) convolution code with g(1) =110, g(2) =101 and g(3) =111

i. Draw the encoder block diagram ii. Find the generator matrix iii. Find the code-word corresponding to the information sequence (11101) using

time-domain and transform-domain approach.

Cont…3

11M

:: 3 ::

10. a) Write a short note on trellis diagram. 5M b) Consider the convolution encoder shown in Fig.3. The code is systematic.

i. Draw the state diagram ii. Find the encoder output produced by the message sequence 10111 iii. Verify the output using time-domain approach

10M

Fig.3




(Regulations: VCE-R11) LANGUAGE PROCESSORS

(Common to Computer Science and Engineering & Information Technology) Date: 30 May, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) What is a compiler? With a block diagram, explain the different phases of a compiler. 11M b) Explain the concept of input buffering.

4M

2. a) With an example, Define left-recursive grammar. How do you eliminate left-recursion from a given grammar? Explain.

8M

b) What are parse trees? Give a LMD,RMD and a parse tree for the sentence id+id*id with respect to the following grammar: i. E E+E ii. E E*E iii. E (E) iv. E id

7M

Unit – II

3. a) Define handle? Explain the conflicts that occur in shift reduce parsing with example. 7M b) Write an algorithm to construct the SLR parsing table.

8M

4. Consider the grammar below: i. S L=R ii. S R iii. L *R iv. L id v. R L Construct the canonical LR(1) items, transition diagram and parsing table (CALR).

15M

Unit – III

5. a) Define Syntax Directed Translation (SDT)? What are the two ways to represent the semantic rules which we associate with grammar symbols?

7M

b) Define Syntax Directed Definition (SDD)? What are the different types of attributes associated with each grammar symbol? Explain. What are the techniques to determine the dependencies between the attributes?

8M

6. a) What are the different graphical ways of representing the Intermediate code? Draw the abstract syntax tree and Directed Acyclic Graph for the input a := b *-c + b*-c.

8M

b) What are the different types of three address code statements? 7M

Cont..2

::2::

Unit – IV

7. a) Write a note on the following : i. Type systems. ii. Type expressions.

10M

b) With a diagram explain the position of type checker.

5M

8. a) List and explain any four source language issues. 8M b) Write a note on the following :

i. Static allocation. ii. Stack allocation.

7M

Unit – V

9. a) Explain function preserving transformations. 7M b) Explain the optimization of basic blocks.

8M

10. a) Explain the following : i. Target program. ii. Input to the code generator. iii. Register allocation.

8M

b) Write and explain the algorithm for partitioning into basic blocks. 7M




(Regulations: VCE-R11) GEO TECHNICAL ENGINEERING-II

(Civil Engineering) Date: 30 May, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) With a neat sketch of soil sampler, define i. Area ratio ii. Recovery ratio iii. Inside clearance iv. Outside clearance

8M

b) List the methods of soil exploration. Explain rotary boring method of soil exploration. 7M 2. a) Explain with neat sketch plate load test. List the limitations of the test. 7M b) In a seismic survey the following readings were obtained.

Time (s) 0.1 0.2 0.3 0.4 0.45 0.5 0.55 Distance (m) 40 80 120 160 200 240 280

Geophones are fixed at 40 m in a straight line. Determine: i. Wave velocity in soil layers. ii. Thickness of top stratum.

8M

Unit – II

3. Explain types of slope failures. 15M

4. a) How a slope is analysed using Swedish circle method? Derive an expression for the factor of safety?

7M

b) An embankment of 10 m height is constructed in a soil having C = 0.02 N/mm2, = 20o and = 6 kN/m3. Find the factor of safety with respect to cohesion and also the critical height of the embankment. Assume stability number = 0.05.

8M

Unit – III

5. a) Differentiate active and passive earth pressure. 5M b) An unsupported excavation is made in a clay layer. The properties of clay are c =

20kN/m2, γ =18kN/m3 and Φ΄ =12. Determine. i. Depth of tension crack. ii. Maximum possible unsupported depth. iii. Draw active earth pressure diagram. Assume the depth of clay layer where cut is made as = 4m.

10M

6. a) How is structural and foundation stability of a retaining wall checked? 5M b) A retaining wall 6m high, with a smooth vertical back is pushed against a soil mass

having c΄= 40kN/m2 and Φ΄=15° and γ =19kN/m3. What is the total Rankine passive pressure, if the horizontal soil surface carries a uniform load of 50kN/m2? What is the point of application of the resultant thrust?

10M

Cont…2

:: 2 ::

Unit – IV

7. a) Determine plate load test and state its applicabilities. 10M b) A square footing is to be constructed on a deep deposit of sand at a depth of 0.9 m to

carry a design load of 300 kN with a factor of safety of 2.5. the ground water table may rise to the ground level during rainy season. Design the plan dimension of footing given. sat = 20.8 kN/m3, Nc = 25, Nq = 34 and N = 32.

5M

8. a) State the basic assumptions in terzaghi’s bearing capacity theory and state the theory. 10M b) A square footing 2.5 m X 2.5 m is built on a homogeneous bed of sand of density 19

kN/m3 having an angle of shearing resistance of 36o. the depth of foundation is 1.5 m below the ground surface. Calculate the safe load that can be applied on the footing with a factor of safety of 3. Take bearing capacity factors as Nc = 27, Nq = 30 and N = 35.

5M

Unit – V

9. a) Explain the mechanism of load transfer in piles. 5M b) A square group of 25 piles extends between depth of 2m and 12m in a deposit of 20m

thick stiff clay overlying rock. The piles are 0.5m in diameter and are spaced at 1m centre to centre in the group. The undrained shear strength of the clay at the pile base level is 180kPa and the average value of the undrained shear strength over the depth of the pile is 110kPa. The adhesion equal to 3 against shear failure. Nc corresponding to Φu= 0 is 9.Determine the ultimate load carrying capacity of pile group.

10M

10. a) Write short note on: i. Well curb. ii. Well steining.

7M

b) Describe the method adopted for the construction and sinking of well foundation. 8M




(Regulations: VCE-R11) DESIGN OF MACHINE MEMBERS-II

(Mechanical Engineering) Date: 30 May, 2015 Time: 3 hours Max Marks: 75


Unit - I 1. a) Briefly explain full and partial journal bearings with a neat sketch. 5M b) A full journal bearing of 60 mm diameter and 100 mm long has a bearing pressure of

1.4 N/mm2. The speed of the journal is 800 rpm and the ratio of journal diameter to the diametrical clearance is 1000. The bearing is lubricated with oil whose absolute viscosity at the operating temperature of 750 C may be taken as 0.011 kg/ms and the room temperature is 300C. Find: i. Amount of artificial cooling required ii. Mass of the lubricating oil required if the difference between the outlet and the

inlet temperature of the oil is 100 C. Take the specific heat of the oil as 1850 J/kg/0C.

10M

2. a) List and explain any five desirable properties of a good bearing material 5M b) A ball bearing is operating on a work cycle consisting of three parts- a radial load of

3,000N at 1440 rpm for one quarter cycle, a radial load of 5, 000 N at 720 rpm for one half cycle, and radial load of 2, 500 N at 1440 rpm for the remaining cycle. The expected life of the bearing is 10, 000 h. Calculate the dynamic load carrying capacity of the bearing.

10M

Unit - II 3. Design a connecting rod of circular cross section from the following data:

i. Diameter of piston or cylinder bore=150 mm ii. Explosion pressure= 3.5 MPa iii. Length of connecting rod=350 mm iv. Stroke of piston =160 mm v. Mass of reciprocating parts= 2.8 kg vi. Speed of engine=1500 rpm vii. Material for the connecting rod=40 C8 steel (yield stress=329 MPa) viii. Factor of safety for buckling =4 ix. Length to diameter ratio of crank pin and gudgeon pin =1.5 x. Allowable bearing pressure at the crank pin=16.5 MPa xi. Allowable bearing pressure at the gudgeon pin =26 MPa xii. Material for the bolt and cap =50 C4 Steel ( yield stress=373 MPa) xiii. Factor of safety for the bolt and cap=4 xiv. Assume any further data if required

15M

4. Design a suitable aluminum alloy piston with two compression rings and one oil ring for a petrol engine from the following data. Cylinder diameter= 100 mm, peak gas pressure=3.2 MPa, mean effective pressure=0.8 MPa, average side thrust=2400N, skirt bearing pressure=0.22 MPa, bending stress in piston=crown=36 MPa, crown temperature difference= 700 C, heat dissipated through crown=157 kW/m2, allowable radial pressure=0.04 MPa, bending stress in piston rings=90 MPa, heat conductivity=160 W/m/0 C and assume further data required.

15M

Cont…2

::2::

Unit - III 5. a) Define and explain law of gearing. Also show that ω1/ω2 =O2P/O1P Where ω1 and ω2 are

angular velocities of pinion and gear. 5M

b) Design a pair of spur gears to transmit 20 kW from a shaft rotating at 1000 rpm to a parallel shaft, which rotates at 310 rpm. Assume number of teeth on pinion 31 and 200 full depth tooth form. The material for pinion is C 45 steel untreated and for gear cast steel 0.2 % C untreated.

10M

6. a) With a neat sketch, explain the double helical gear or Herringbone gear. 5M b) A pair of parallel helical gears consists of a 20 teeth pinion meshing with a 100 teeth

gear. The pinion rotates at 720 rpm. The normal pressure angle is 200, while the helix angle is 250. The face width is 40 mm and the normal module is 4 mm. The pinion as well as gear are made of steel 40C8 (ultimate stress=600 MPa) and heat-treated to a surface hardiness of 300 BHN. The service factor and the factor of safety are 1.5 and 2 respectively. Assume that the velocity factor accounts for the dynamic load. Calculate the power transmitting capacity of gears.

10M

Unit - IV 7. a) List the detailed classifications of bevel gears. 5M b) A pair of straight bevel gears consists of a 24-teeth pinion meshing with a 48 teeth gear.

The module at the outside diameter is 6 mm, while the face width is 50 mm. The gears are made of grey cast iron FG 220 (ut= 220 N/mm2). The pressure angle is 200. The teeth are generated and assume that velocity factor account for the dynamic load. The pinion rotates at 300 rpm and the service factor is 1.5. Calculate: i. The beam strength of the tooth ii. The static load that the gears can transmit with a factor of safety of 2 for bending

considerations and iii. The rated power that the gears can transmit

10M

8. a) List advantages and drawbacks of worm gear drives. 5M b) A pair of worm gears is designated as 1/52/10/8. The worm rotates at 1000 rpm and the

normal pressure angle is 200. Determine the coefficient of friction and the efficiency of the worm gears.

10M

Unit - V 9. a) Explain the following with simple sketches.

i. British standard whit worth (B.S.W) thread: ii. Square Thread iii. ACME Thread iv. Buttress Thread

8M

b) A double threaded power screw with ISO metric trapezoidal thread is used to raise a load of 500 kN. The nominal diameter is 80 mm and the pitch is 10 mm. The coefficient of friction at screw thread is 0.15. By neglecting the collar friction calculate the following: i. Torque required to raise he load ii. Torque required to lower the load iii. Efficiency of the screw

7M

10. a) What are the main requirements of machine tool beds? Also, explain the main factors that predominate in machine tool beds.

9M

b) What are the requirements of spindle? Explain them. 6M




(Regulations: VCE-R11) AEROSPACE PROPULSION-II



Unit – I

1. a) With a neat sketch explain single stage velocity triangle and derive expression for work output.

8M

b) Discuss the limitations in the design of gas turbine.

7M

2. a) Explain vortex theory. 7M b) Explain film cooling and transpiration cooling as applied to blade cooling in gas turbine.

8M

Unit – II

3. a) Discuss the principle of scram jet engine and list out any four advantages of scram jet engine.

7M

b) With neat sketch explain the working of turbo fan engine.

8M

4. a) List out any seven characteristics of ram jet engine. 7M b) Explain the basic theory of rocket operation.

8M

Unit – III

5. a) Classify different types of rockets. 5M b) Explain the working principle of turbo pump feed system rocket engine.

10M

6. a) Explain the working principle of hybrid rocket engine. 10M b) Mention advantages of liquid propellant rockets over solid propellant rockets.

5M

Unit – IV

7. a) Describe internal ballistics. 5M b) Explain the working principle of pulse jet rocket engine.

10M

8. a) Discuss the operating principle of rocket propulsion. 7M b) Explain specific impulse of rockets and explain the variation of impulse with mach

number. 8M

Unit – V

9. a) With neat sketch explain the working of ion rocket engine. 8M b) Write short notes on staging of rockets.

7M

10. a) With neat sketch explain the working of solar rocket engine. 8M b) What are the factors important in comparison of different types of rockets? 7M



(AUTONOMOUS) B. Tech VI Semester Regular/Supplementary Examinations, May/June - 2015

(Regulations: VCE-R11) DIGITAL SIGNAL PROCESSING

(Electronics and Communication Engineering) Date: 08 June, 2015 FN Time: 3 hours Max Marks: 75


Unit – I 1. a) Consider the input signal 10 2 5 6x n u n u n u n and impulse

,| 1.|nh n u n Compute the output *y n x n h n .

8M

b) Determine whether the following discrete time- LTI systems characterized by impulse response are stable or causal,

1.2

1.2

n

i h n u n

ii h n n u n

7M

2. a) Find the total response of the system given by the difference equation 1 2 2 1 1, 2 1 2 . y n y n y n x n with y y and x n u n

8M

b) Find the output of LTI system represented by 1, 2 3 , 4h n and the input

2,1,3, 2x n . Using graphical method.

7M

Unit - II 3. a) State and prove the following properties of DTFS:

i. Frequency shift ii. Parseval’s Theorem

7M

b) By means of DFT and IDFT, determine the sequence y(n) corresponding to the circular convolution of the sequences 2,1, 2,1x n and 1, 2,3, 4y n .

8M

4. a) Compute the 8-point DFT of the sequence, 1,1,1,1,0,0,0,0x n using the radix-2 decimation-in-time-algorithm.

8M

b) State and prove the following properties of DFT: i. Circular frequency shift ii. Time reversal of a sequence

7M

Unit - III 5. a) Find the z transform of the following discrete time signals and mention its ROC:

1. 2 32

1. 3 2 12

nn

n

i x n u n u n

ii x n u n u n

8M

b) Given H(z) = 2 1z

z ROC |Z|>1

i. Is the system BIBO stable? Give reason ii. Find the difference equation for realization of the system connecting input and

output . Cont…2

7M

:: 2 ::

6. a) Obtain the parallel realization of the system:

H(z)=

1

1 1 2

14

1 1 11 12 2 4

z

z z z

8M

b) Realize the linear –phase FIR filter having the following impulse response

1 1 11 2 3 44 8 4

h n n n n n n

7M

Unit - IV 7. a) Determine the coefficients of a linear phase FIR filter of length N=15 which has a

Symmetric unit impulse response and a frequency response that satisfies the condition 1, 0,1,2,30,

215 4,5,6,7r

kkHk

7M

b) The desired highpass frequency response is sampled to give

0 0 0 1 1 1 1 1 .0 0H k Find the antisymmetric impulse response h n of

the FIR filter designed using frequency sampling technique.

8M

8. a) A third order Butterworth low pass filter has the transform function

2

11 1

H ss s

Design H (z) using impulse invariant technique.

7M

b) Design a digital Chebyshev I filter that satisfies the following constraints:

0.8 1H w , 0 0.2 w

0.2H w 0.6 w

Use impulse invariant transformation.

8M

Unit – V

9. a) Explain the method of sampling rate conversion by a factor I/D. 8M b) Draw the block diagram of poly phase filter structure for down sampling value M=3.

7M 10. a) Explain the up sampling and down sampling with a suitable examples. 7M b) Consider the signal nx n a u n , 1a ,

i. Determine the Spectrum X(w) ii. The signal x (n) is applied to a decimator that reduces the rate by 2. Determine

the output spectrum. Show that the spectrum in part ii is simply Fourier transform of x (2n).

8M




(Regulations: VCE-R11) HEAT TRANSFER

(Mechanical Engineering) Date: 08 June, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) i. Discuss the different modes of heat transfer? 10M ii. A surface of area 0.5m2, emissivity 0.8 and temperature 150 0C is placed in a large,

evacuated chamber whose walls are maintained at 25 0C. Find the rate at which radiation is emitted by the surface? What is the net rate of radiation exchange between the surface and the chamber walls?

Assumptions: Area of the enclosed surface is much less than that of chamber walls. Stefan Boltzmann constant: σ = 5.67*10-8 W/m2.K4

b) A 15 cm × 20 cm circuit board houses 120 closely spaced 0.12 W logic chips. The amount of heat dissipated in 10 hrs and the heat flux on the surface of the circuit board are to be determined. It Assumed that, i. Heat transfer from the back surface of the board is negligible. ii. Heat transfer from the front surface is uniform.

5M

2. a) i. State the Fourier law of heat conduction and thermal diffusivity of material. 10M ii. A large plane wall is subjected to a heat flux of 700 W/m2 and a temperature of

80oC on the left surface and no conditions on the right surface. The thermal conductivity is given as k =2.5 W/m°C The mathematical formulation, the variation of temperature in the plate, and the right surface temperature are to be determined for steady one-dimensional heat transfer

Fig. 1

Assumptions to be made are : i. Heat conduction is steady and one-dimensional since the wall is large relative to its

thickness, and the thermal conditions on both sides of the wall are uniform. ii. Thermal conductivity is constant. iii. There is no heat generation in the wall.

b) A 2kW resistance heater wire (radius=0.0025m and length=0.7m) with a specified surface temperature of 110oC is used to boil water. The center temperature of the wire is to be determined. Assumptions : i. Heat transfer is steady since there is no change with time. ii. Heat transfer is one dimensional since there is thermal symmetry about the center

line and no change in the axial direction. iii. Thermal conductivity is constant. iv. Heat generation in the heater is uniform. v. Properties: The thermal conductivity is given to be k = 20 W/m°C.

5M

Cont…2

:: 2 ::

Unit – II

3. a) A brick wall of 10cm thick is initially at a uniform temperature of 230 oC .The wall is suddenly exposed to a convective environment of 30 oC with a surface heat transfer coefficient of 60W/m2-K Determine: i. The centre temperature at 2hour after the exposure to the ambient ii. Energy removed from the wall per m2 during 2 hours iii. What would be the time taken for the surface of the wall to reach a temperature of

40 oC. Take mass density ρ=2300 Kg/m3,Thermal conductivity K=0.69W/m-K,Thermal diffusivity α=0.5*10-6m2/sec

9M

b) A thin copper plate is sandwiched between two epoxy boards. The error involved in the total thermal resistance of the plate if the thermal contact conductance’s are ignored is to be determined. Properties : The thermal conductivities are given to be k = 386 W/m°C for copper plates and k = 0.26 W/m°C for epoxy boards. The contact conductance at the interface of copper-epoxy layers is given to be hc = 6000 W/m2°C. Assumptions : i. Steady operating conditions exist. ii. Heat transfer is one-dimensional since the plate is large. iii. Thermal conductivities are constant.

Fig. 2

6M

4. a) A circuit board houses 100 chips, each dissipating 0.07 W. The surface heat flux, the surface temperature of the chips, and the thermal resistance between the surface of the board and the cooling medium are to be determined.(h= 10 W/m2 . C and surface area of the board is (0.12 m)(0.18 m) ) and T∞ is 40oC Assumptions : i. Steady operating conditions exist. ii. Heat transfer from the back surface of the board is negligible. iii. Heat is transferred uniformly from the entire front surface.

7M

b) Aluminum sphere with 2 cm diameter, in warm water bath. Twater = 40 oC, Tinitial = 20 oC. h = 400 W/m2 K. Find: Temperature at the center of the sphere at t = 20 sec and also calculate the Biot number. Properties are : kAl = 170 W/mK, CpAl = 880 J/kgK, and ρAl = 2780 kg/m3

8M

Unit – III

5. a) The approximate velocity profile u(x,y) for laminar flow over a flat plate is given by the expression

,

sin2

u x y yU

where U∞ is the free stream velocity of the fluid and δ is the velocity boundary layer thickness

given by

4.795

x

xR

; Rex = Reynolds number at a location ‘x’ from the leading edge of

the plate Find: i. Expression for local drag coefficient. ii. Expression for average drag coefficient for a total length L of the plate.

8M

:: 3 ::

b) If in the above problem water is flowing at a velocity of 1 m/s and at a temperature of

800c, find the drag force experienced by the fluid if the plate is 15 cm long in the direction of flow and 5 cm width.

7M

6. a) Explain the following: i. Velocity boundary layer ii. Thermal boundary layer

5M

b) Water at 20 oC with a flow rate of 5Kg/s enters a circular tube of 5 cm inner diameter and 10m long. if the tube surface is maintained at 80 oC. Determine the exit temperature of water.

10M

Unit – IV

7. a) Differentiate between film wise and drop wise condensation. 5M b) A Circular plate of 25cm diameter with both surfaces maintained at a uniform

temperature of 100 oC is suspended in a horizontal position in atmospheric air at 20 oC. Determine the heat transfer from the plate.

10M

8. a) Write short notes on fouling factor. 5M b) A one-shell pass, two-tube pass exchanger is to be designed to heat 0.5 kg/s of water

entering the shell side at 10 0 C. The hot fluid oil enters the tube at 80 0 C with a mass flow rate of 0.3 kg/s and leaves the exchanger at 30 0 C. The overall heat transfer coefficient is 250 W/m2-K. Assuming the specific heat of oil to be 2 kJ/kg-K, calculate the surface area of the heat exchanger required.

10M

Unit – V

9. a) State the following laws of radiations: i. Bolzmann law ii. Planck law

8M

b) A radiation shield is placed between two large parallel plates which are maintained at uniform temperatures(T1=650K& T2=400K). The emissivity of the radiation shield is to be determined if the radiation heat transfer between the plates is reduced to 15% of that without the radiation shield. Assumptions

i. Steady operating conditions exist ii. The surfaces are opaque, diffuse, and gray. iii. Convection heat transfer is not considered. Properties The emissivities of surfaces are given to be ε1 = 0.6; ε2 = 0.9; σ=5.67 *10-8 W/m2. K4

7M

10. a) Briefly discuss the electrical analogy of radiation. 8M b) A diffusely emitting surface is exposed to a radiant source causing the irradiation on the

surface to be 1000W/m2 .The intensity for emission is 143W/m2 and the reflectivity of the surface is 0.8. Determine the emissive power, E(W/m2 ) and radiosity, J(W/m2 ), for the surface. What is the net heat flux to the surface by the radiation mode?

7M




(Regulations: VCE-R11) WATER RESOURCES ENGINEERING-II

(Civil Engineering) Date: 08 June, 2015 FN Time: 3 hours Max Marks: 75


Unit – I

1. a) Write about classification of dams based on the structural behavior. 10M b) What is meant by spillway and location as a factor governing selection of type of dam?

5M

2. a) Write about determination of reservoir capacity required for a specified yield or demand using a mass curve.

10M

b) The yield of water from a catchment area during each successive month is (1.7, 2.1, 2.8, 8.4, 11.9, 11.9, 7.7, 2.8, 2.52, 2.24, 1.96, 1.68) x 106 m3. Determine the minimum capacity of a reservoir required to allow the above volume of water to be drawn off at a uniform rate assuming that there is no loss of water over the spillway.

5M

Unit – II

3. a) Explain the various forces acting on a gravity dam. 7M b) Following data were obtained from the stability analysis of a concrete gravity dam:

i. Total overturning moment above toe = 1x 105 t-m. ii. Total resisting moment above toe = 2x 105 t-m. iii. Total vertical force above base = 5000 t. iv. Base width of the dam = 50 m. v. Slope of the downstream face = 0.8 (H) : 1 (V). Calculate the maximum and minimum vertical stress to which the foundation will be subjected to. What is the maximum principal stress at toe? Assume there is no tail water.

8M

4. a) With neat sketch explain the types of earth dams. 7M b) Explain the various seepage control measures required for earth dam.

8M

Unit – III

5. a) What do you understand by a fall in a canal? Why it is necessary? How do you select its location?

7M

b) Explain the procedure of designing Sarda type fall. 8M 6. a) What do you understand by a head regulator? State functions of a distributary head

regulator and a cross-regulator. 5M

b) Design a cross-regulator for a distributary channel taking off from the parent channel, for the following data. Discharge of parent channel = 100 cumecs Discharge of distributary = 15 cumecs F.S.L. of parent channel: u/s = 218.1 m, d/s = 217.9 m Bed width of parent channel: u/s = 42 m, d/s = 38 m Depth of water in parent channel: u/s = 2.5m, d/s = 2.5 m F.S.L. of distributary = 217.10m Bed width of distributary = 15 m Depth of water in distributary = 1.5m Permissible exit gradient = 1/5.

Cont…2

10M

:: 2 ::

Unit – IV

7. a) Define Barrage. Write a sketch of the layout of a barrage and indicate its component parts.

8M

b) What is an Anicut or a Weir? Write the advantages and disadvantages of a weir.

7M

8. Design the hydraulic calculations and the weir wall for a vertical drop weir on Bligh’s theory for the following site conditions: i. Maximum flood discharge = 2800 cumecs ii. H.F.L. before construction = 285.0 m iii. Minimum water level = d/s bed level = 278.0 m iv. F.S.L. of canal = 284.0 m v. Allowable afflux = 1 m vi. Coefficient of creep = 12 vii. Permissible exit gradient = 1/6. Assume any other data not given.

15M

Unit – V

9. a) Write a note on ogee-shaped spillway. 7M b) Compute the discharge over an ogee weir with coefficient of discharge equal to 2.4 at a

head of 2 m. The length of the spillway is 100 m. The weir crest is 8 m above the bottom of the approach channel having the same width as that of the spillway.

8M

10. Design a siphon aqueduct for the following data: i. Discharge of the canal = 25 cumecs ii. Bed width of the canal = 20 m iii. Depth of water in the canal = 1.5 m iv. Bed level of the canal = 160.0 m v. High flood discharge of the drainage = 400 cumecs vi. High flood level of the drainage = 160.5 m vii. Bed level of the drainage = 158.0 m viii. General ground level = 160.0 m.

15M




(Regulations: VCE-R11) OBJECT ORIENTED DESIGN AND PATTERNS

(Common to Computer Science and Engineering & Information Technology) Date: 08 June, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) What is model? Discuss the common modeling techniques for simple dependencies and single inheritance with an example.

9M

b) What do you mean by a class? Discuss its attributes, operations and relationships with suitable example.

6M

2. a) Write guidelines to model static and dynamic types with neat diagrams. 8M b) Explain the following terms with correct UML notations.

i. Visibility ii. Qualification iii. Components

7M

Unit – II

3. a) Illustrate the process of identifying class from a functional specification using a suitable example.

8M

b) Bring out the significance of inheritance with suitable example.

7M

4. a) What is a use case? Write a use case “Leave a Message” for a voice mail system. 10M b) What is composition? Illustrate with a suitable example.

5M

Unit – III

5. a) How do you enforce encapsulation using accessor and mutator ? Write suitable code segment for the followings: i. Implement a class TimeOfDay that stores a time between 00:00:00 and 3:59:59.

Use three integers for the hours, minutes, and seconds as the internal representation.

ii. Supply a constructor TimeOfDay(int hours, int minutes, int seconds) and accessor methods to get the current hours, minutes, and seconds.

iii. Supply methods TimeOfDay addSeconds(int seconds): returns a TimeOfDay object that is the given number of seconds away from the current object, and int secondsFrom(TimeOfDay other) : computes the number of seconds between two TimeOfDay objects

10M

b) State and explain different criterias used to analyze the quality of the interface of a class.

5M

6. a) Discuss any four ideas that surrounding the concepts of programming by contract. 8M b) What are interfaces? Illustrate with an example, the use of Comparable & Comparator

interface. 7M

Cont…2

::2::

Unit – IV

7. a) Explain the context and solutions of observer pattern with suitable class diagram. 7M b) Define strategy pattern. Explain its structure with an example.

8M

8. a) Explain with an appropriate pattern, how to design an object which refers another object for its properties.

8M

b) Explain the context and solutions of template method with a neat diagram.

7M

Unit – V

9. a) Differentiate framework from patterns. Discuss about Collections framework with an example.

8M

b) Explain with an appropriate pattern, how to create several kinds of objects whose classes are not known when the system is built.

7M

10. a) Explain with an appropriate pattern, how to design an object that is a stand-in for another object.

7M

b) Discuss the pattern that teaches how to support an open-ended set of operations on an object structure with a fixed set of element types.

8M




(Regulations: VCE-R11) FLIGHT VEHICLE DESIGN (Aeronautical Engineering)

Date: 08 June, 2015 FN Time: 3 hours Max Marks: 75


Unit - I 1. a) Briefly discuss the phases of aircraft design. 8M b) Draw the three views of the layout of a 60 seater high subsonic aircraft.

7M

2. a) Discuss the effect of obstacle clearance distance of an aircraft. 7M b) Discuss the performance requirements of an aircraft. 8M

Unit - II 3. a) Discuss the development of configuration layout from conceptual design. 7M b) Explain longitudinal control line. Explain the generation of outer profile of fuselage of an

aircraft using longitudinal control lines.

8M

4. a) Describe the selection of thrust-to-weight ratio and wing loading. 8M b) Elaborate how airfoil selection is done during airfoil design? 7M

Unit - III 5. a) Briefly explain landing gear arrangements. 8M b) Write a short note on a installed thrust methodology.

7M

6. a) With the help of neat sketch write down the force equations on aircraft in steady climb. 8M b) Explain the distribution of airloads on lifting surfaces. 7M

Unit - IV 7. a) Explain the stability and control derivative of aircraft. 7M b) Discuss the advantages and disadvantages of canard wing of an airplane.

8M

8. a) Discuss the estimation of aerodynamic characteristics. 8M b) Discuss the factors to be considered while designing the fuselage of passenger aircraft. 7M

Unit - V 9. a) Draw the three views of DC-1 aircraft with neat sketches 7M b) Draw the three views of double delta wing of aircraft.

8M

10. a) Draw the three views of uninhabited air vehicle. 7M b) With neat sketch explain conic shape parameter. 8M




(Regulations: VCE-R11) ELECTRICAL MEASUREMENTS

(Electrical and Electronics Engineering) Date: 08 June, 2015 FN Time: 3 hours Max Marks: 75


Unit – I

1. a) What are the different methods of producing damping torque for an indicating type of instrument? Derive the deflecting torque derivation for PMMC instrument.

8M

b) Derive an expression for the ratio error of a current transformer.

7M

2. a) With a neat sketch explain briefly the construction and principle of operation of an electrometer type electrostatic voltmeter.

8M

b) A moving coil meter has a resistance of 10 and takes 25 mA to produce full scale deflection. How can the meter be adopted to measure: i. Voltage upto 120 volt ii. Current upto 20 Amp

7M

Unit – II

3. a) Mention the need of Low Power Factor wattmeter. Explain the special features incorporated in an electrodynamometer wattmeter to make it a low power factor type of wattmeter.

7M

b) Prove that steady state speed ‘N’ is directly proportional to power in single phase induction type energy meter. Also mention the errors in single phase energy meter.

8M

4. a) With a neat sketch, explain the construction and working of a Ferrodynamic resonance type frequency meter.

8M

b) An energy meter has a meter constant of 100 rev / KWh. If the meter is connected to a load carrying 40 A at 230 V and 0.4 p.f. for an hour, calculate the number of revolutions made by it. Find the percentage error if it actually makes 360 revolutions.

7M

Unit – III

5. a) Explain with a neat circuit diagram co-ordinate type A.C. potentiometer. 8M b) Explain how D.C potentiometer is used for the measurement of:

i. Unknown resistance ii. Current

7M

6. a) Explain how unknown current and voltage is measured using D.C. potentiometer. 8M b) A basic slide wire potentiometer has a working battery of 3.0 V with negligible internal

resistance. The resistance of slide wire is 400 Ω and its length is 200 cm. A 200 cm scale is placed along the slide wire. The slide wire has 1mm scale division and it is possible to read upto 1/5 of a division. The instrument is standardized with 1.018V standard cell with sliding contact at the 101.8 cm mark on scale. Calculate: i. The requirements needed for the DC potentiometer ii. Resolution of instrument

Cont…2

7M

:: 2 ::

Unit – IV

7. a) Explain Carey-Foster Slide-Wire bridge for the measurement of resistance. 7M b) In the Wheatstone bridge shown in Fig.1 below, the values of resistances of various arms

are P=1000 Ω, Q=100 Ω, R= 2005 Ω and S= 200 Ω. The battery as an emf of 5V and negligible internal resistance. The galvanometer has a current sensitivity of 10mm/µA and an internal resistance of 100 Ω. Calculate the deflection of galvanometer and the sensitivity of the bridge in terms of deflection per unit change in resistance.

Fig.1

8M

8. a) Explain the measurement of high resistance using Loss of charge method. 8M b) Obtain the expression for the balance of Wheatstone bridge. Mention the limitation of

Wheatstone bridge.

7M

Unit – V

9. a) Draw a neat circuit diagram of Maxwell’s inductance bridge. Obtain the expression for unknown inductance and Q factor. Mention its disadvantages.

8M

b) Explain the measurement of magnetic force using Ballistic galvanometer with the help of neat diagram.

7M

10. a) Sketch a neat diagram of low voltage Schering bridge and explain. Obtain the expression for unknown capacitance and Dissipation factor.

7M

b) An AC bridge for the measurement of resistance and self-inductance of a coil has the following arms. Arm AB – unknown impedance coil. Arm BC – A non-inductive resistance of 600. Arm CD – A non-reactive resistance of 1000. In parallel with a capacitor of 0.5 F. Arm DA – A standard resistance of 400 if the supply frequency is 50 Hz and the bridge is at balance. Find the resistance and inductance of the coil.

8M




(Regulations: VCE-R11) POWER ELECTRONICS

(Electrical and Electronics Engineering) Date: 04 June, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) Explain class B - self commutation by an LC circuit and Class C commutation with waveforms.

7M

b) Explain the turn on mechanism of the thyristor using two transistor analogy with neat diagram and circuit and using two transistor analogy model show that

2 g CB1 CBO2

1 2

α I +I +II- α +αaI

8M

2. a) Explain different methods used to turn on thyristor. 8M b) The IGBT used in the circuit of Fig.1 shown below has the following data:

tON=3µs, tOff=1.2µs, D=0.7, VCE(sat)=2 V and fs=1 kHz. Determine: i. Average load current ii. Conducting Power loss iii. Switching power loss during turn-on and turn-off.

Fig.1

7M

Unit – II

3. a) A fully controlled converter is connected to R-L-E load. The load inductance is sufficiently large, assume the load current is constant ripple-free. Explain the operation of the converter and draw wave forms of i. Supply voltage ii. Source current iii. Output voltage at any firing angle . Also derive expression for average output voltage.

8M

b) A single phase half-controlled bridge converter is operated from a 220 V, 50 Hz supply. The load current is continuous with negligible ripple content, the average value of load current is 10 A. the turns ratio of the transformer is unity. If the delay angle is ( )3

. Calculate: i. The input current. ii. The input power factor.

Cont…2

7M

:: 2 ::

4. a) Explain the relative merits of half-controlled bridge converters and fully-controlled bridge converters.

5M

b) With a neat circuit diagram explain the operating of a half controlled bridge rectifier. Assume load current is constant and ripple free. Draw the waveforms of i. Supply voltage ii. Output voltage iii. Supply current at any firing angle . iv. Drive the expression for input power factor in terms of firing angle .

10M

Unit – III

5. a) With neat circuit diagram explain the operation of Three phase Half wave controlled rectifier with resistive load. Derive the expression for RMS Load voltage in continuous mode.

8M

b) Draw three possible configurations of single-phase a.c voltage controller. Also draw the related wave forms of single-phase a.c voltage controller with resistive load and obtain the expression for power factor.

7M

6. a) Explain Simple six pulse Mid-point converter with inductive load with help of neat diagram and wave form.

7M

b) A single phase a.c voltage with R-L load has the following details: Supply voltage = 230 V, 50 Hz; details; R=4 Ω and ωL = 3Ω. Calculate i. The control range of firing angle. ii. Maximum value of RMS load current. iii. Maximum power and power factor. iv. The maximum values of average and RMS thyristor current.

8M

Unit – IV

7. a) With a neat circuit diagram explain the working of Morgan’s chopper. Also draw the relevant waveforms.

7M

b) What is a cyclo-converter? Explain the principles of operation of bridge configuration of single phase cyclo-converter. Draw the circuit diagram and wave forms.

8M

8. a) Explain the principle of operation of a step up chopper with suitable circuit diagram. Derive the expression for voltage across the load.

8M

b) A step-down chopper is feeding an R-L-E load, the circuit parameters are Vs = 220 V, R = 10 , L = 15.5 mH, E = 20 V chopping frequency f = 10 KHz, duty ratio = 0.5. Calculate i. Average output voltage. ii. Average load current. iii. Peak-to-peak current ripple in the load.

7M

Unit – V

9. a) Explain pulse - width- modulation technique for voltage control of inverters. Draw the output voltage and discuss.

7M

b) The single-phase full-bridge inverter has an R-L load with R = 5 and L = 20 mH. The inverter frequency f0 = 60Hz. The dc input voltage = Vs = 220 V. Calculate i. The load current at the fundamental frequency. ii. RMS load current.

8M

10. a) Explain the operation of a basic series inverter. Draw the waveforms. Give the circuits limitations.

7M

b) Draw a neat diagram of single phase half bridge inverter with R Load and explain its operation. Obtain the expression for instantaneous output voltage.

8M




(Regulations: VCE-R11) OPERATIONS RESEARCH

(Common to Civil Engineering & Aeronautical Engineering) Date: 04 June, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) A company produces two types of leather belts, type A and type B. Profits on these two types of belts are Rs.4 and Rs.3 for belt respectively. Each belt of type A requires twice as much time as required by a belt of type B. If all belts were of type B, the company produces 1000 belts/day. The supply of leather is sufficient only for 800 belts/day. Belt A requires a fancy buckle and only 400 buckles are available per day. In case of belt B only 700 buckles are available per day. How should the company manufacture the two types of belt in order to maximize profit? Solve graphically.

6M

b) Solve following LP model by Simplex Method. Minimize 1 2 3 3 2Z x x x

Subject to 1 2 33 2 7x x x

1 2 2 4 12x x

1 2 34 3 8 10x x x

1 2 3, , 0x x x

9M

2. Solve the following LPP using Big M method. Minimize, 1 2 4 Z x x

Subject to, 1 23 3x x

1 24 3 6x x

1 22 4x x

1 2, 0x x

15M

Unit – II

3. Solve the following transportation problem for its optimality by finding initial BFS using N-W corner method.

I II III IV Demand A 5 3 6 4 30 B 3 4 7 8 15 C 9 6 5 8 15

supply 10 25 18 7

15M

Cont…2

4.

a)

:: 2 ::

What is Degeneracy in Transportation problem? How to resolve it?

3M b) A marketing manager has five salesmen and five sales districts. Considering the

capabilities of salesmen and nature of districts, the marketing manager estimates sales per month (in hundreds of rupees) for each salesman in each district and are given in the following table. Find the assignment of salesmen to districts that will result in maximum sales.

Districts Salesmen

A B C D E 1 32 38 40 28 40 2 40 24 28 21 36 3 41 27 33 30 37 4 22 38 41 36 36 5 29 33 40 35 39

12M

Unit – III

5. a) In a barber’s shop with a single barber, there are three chairs. One is for hair cutting and the other two for waiting inside the shop. If there are more than three customers in the shop at any time, then three will occupy the chairs and rest will wait outside. The customers come according to Poisson distribution with average 2 customers per hour. The service time is exponentially distributed with a mean of 20 mins. i. Find the probability that an arriving customer has to wait outside the shop ii. Find the probability that an arriving customer gets a chair to sit iii. How long is an arriving customer expected to wait before start of Service

7M

b) A self service store employs one cashier at its counter. 9 customers arrive in an average every 5 minutes while the cashier can serve 10 customers in 5 minutes. Assuming Poisson distribution for arrival rate and exponential distribution for service rate, find: i. Average number of customers in the system ii. Average number of customers in the queue iii. Average time a customer spends in the system iv. Average time a customer waits before being served

8M

6. a) Four jobs 1,2,3 and 4 are to be processed on each of the four machines A,B,C and D in the order ABCD. The processing time in minutes are given in the table below. Find the minimum elapsed time.

A B C D 1 58 14 14 48 2 30 10 18 32 3 28 12 16 44 4 64 16 12 42

8M

b) We have 5 jobs, each of which must be processed on 2 machines A and B in the order AB. Processing times in hours is given below:

Determine a sequence for 5 jobs that will minimize the elapsed time T.

1 2 3 4 5 A 5 1 9 3 10 B 2 6 7 8 4

7M

Cont…3

:: 3 ::

Unit – IV

7. a) An auto rickshaw driver finds from his previous records that the cost/year of running an auto rickshaw whose purchase price is Rs. 7000/- is as follows:

Year 1 2 3 4 5 6 7 8 maintenance costs 1100 1300 1500 1900 2400 2900 3500 4100 Resale Value 3100 1600 850 475 300 300 300 300

When should the auto rickshaw be replaced?

8M

b) Consider the following all unit discount pricing schedule. Annual demand is 7000 units. Ordering cost is Rs. 60. Holding charges is 15 %. Evaluate the no. of bottles that should be ordered in each lot.

Order Quantity Unit price 0-3000 Rs. 4.0 3000 or above Rs. 3.35

7M

8. a) Derive the equation for Economic Order Quantity. 5M b) A company buys a machine for Rs 6000/-. The maintenance costs are expected to be

Rs. 300/- in each year for the first 2 years and go up annually as follows 700, 1000, 1500, 2000, and 2500. Assume the money is worth of 20% per year. When the machine should be replaced?

10M

Unit – V

9. Reduce the following game by dominance to 2x4 and hence solve by graphical method.

Player B

Player A 8 15 -4 -2 19 15 17 16 0 20 15 5

15M

10.

a)

Explain the procedure for solving a problem by using Dynamic programming.

5M b) Solve the following game by using the principle of dominance

I II III IV V VI 1 4 2 0 2 1 1 2 4 3 1 3 2 2 3 4 3 7 -5 1 2 4 4 3 4 -1 2 2 5 4 3 3 -2 2 2

10M




(Regulations: VCE-R11) FINITE ELEMENT METHODS



Unit - I 1. a) Obtain the D matrix using the generalized Hook’s law relations. 7M b) What is Isoparametric formulation, discuss with reference to linear interpolation of the

displacement field with an element.

8M

2. a) Write the application of FEM. 5M b) For the bar shown in Fig.1. Using the penalty approach for handling boundary conditions,

determine the nodal displacement, stress in each material and reaction forces. Take length of Aluminium bar as 300 mm and Steel bar as 400mm.

Fig. 1

10M

Unit - II 3. Consider the four-bar truss shown in Fig.2. It is given that E=29.5X106 psi and Ae = 1 in2. For

all elements. Complete the following: i. Determine the element stiffness matrix for each element ii. Assemble the structural stiffness matrix K for the entire truss iii. Using the elimination approach, solve for the nodal displacement iv. Recover the stresses in each element v. Calculate the reaction forces

Fig. 2

Cont…2

15M

::2::

4. For the beam and loading as shown in Fig.3. Determine the slopes at the two ends of the distributed load and the vertical deflection at the mid-point of the distributed load. Take E=200 GPa. And I=4X106 mm4

Fig. 3

15M

Unit - III 5. a) Derive the element stiffness matrix for CST. 7M b) Find the strain nodal displacement matrix B for the elements shown in below Fig.4. Use

local numbers given at the corners?

Fig. 4

8M

6. Axisymmetric body with a linearly distribute load on the conical surface is shown in Fig.5. Determine the equivalent point loads at nodes 2,4 and 6.

Fig. 5

15M

Unit - IV 7. A long bar of rectangular cross section, having thermal conductivity of 1.5 W/m0C is

subjected to the boundary conditions shown in Fig.6. Two opposite sides are maintained at a uniform temperature of 1800C, one side is insulated, and the remaining side is subjected to a convection process with T = 250C and h = 50 W/m2 0C. Determine the temperature distribution in the bar.

Fig. 6 Cont…3

15M

:: 3 ::

8. Consider the shaft with a rectangular cross section shown in Fig.7. Determine in terms of M

and G, the angle of twist per unit length.

Fig. 7

15M

Unit - V 9. Derive an element mass matrices for:

i. Bar element ii. Truss element iii. CST element

15M

10. Determine the Eigen values and Frequencies for the stepped bar shown in Fig.8:

Fig. 8

15M




(Regulations: VCE-R11) C# AND .NET FRAMEWORK

(Common to Computer Science and Engineering & Information Technology) Date: 04 June, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) Explain with a neat diagram the Building Blocks of .Net platform. 9M b) Write the proper syntax for the following using csc:

i. Compile a test.cs file which is referencing an external assembly System.Windows.Forms.dll.

ii. Generate a bug report into an error.txt file after compiling a test.cs file. iii. Compile test.cs file and the output file after compilation must have its name as

test1.exe.

6M

2. a) Illustrate the workflow that takes place between source code, .Net compiler and .Net execution engine.

8M

b) Explain the role of CIL, metadata and manifest in the .Net framework. 7M

Unit – II

3. a) What are different variations possible on main() method? 9M b) Bring out the significance of params modifier with a suitable example.

6M

4. a) Illustrate the role of System. Convert with a suitable example. 5M b) What are the two types of multidimensional arrays supported by C#? Write code

snippet to illustrate the same.

10M

Unit – III

5. a) Explain the use of ‘as’ and ‘is’ keywords with an example for each. 5M b) Write a C# program to illustrate the implementation of classical inheritance in C#.

10M

6. a) Explain the difference between read only and write only properties with an example for each.

10M

b) Write a C# program to demonstrate the use of try and catch blocks in handling exceptions in C#.

5M

Unit – IV

7. a) What is a delegate? Explain with an example all the components of a delegate. 7M b) Explain with an example how to build and consume a single file assembly in C#.

8M

8. a) Explain how to configure shared assemblies with an example. 5M b) Write a C# program to implement the following:

i. Define a function SUM that adds two integers and returns the sum of them. ii. Define a delegate that points to any function that takes two integers as

parameters and returns an integer. iii. Call the function SUM using the delegate and print the result appropriately.

Cont…2

10M

:: 2 ::

Unit – V

9. a) Explain briefly .NET data provider model. 7M b) What methods can affect the value of a row’s Data Row Version property?

8M

10. a) What is connected layer of ADO.NET? What are the steps to be followed to connect to a database and read the records using a data reader object?

7M

b) Discuss few methods of Dataset with respect to ADO.NET. 8M




(Regulations: VCE-R11) MICROWAVE ENGINEERING

(Electronics and Communication Engineering) Date: 04 June, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) What are cavity resonators? Derive the equations for resonant frequencies for a rectangular and circular cavity resonator.

8M

b) A microstrip line with W=2mm, h= 0.4mm has a quartz substrate of εr=3.8 and tanδ = 0.0001. Find: i. Effective permittivity ii. Characteristic impedance and iii. αc and αd at 9GHz. (=5.8 x 107mhos)

7M

2. a) Write the applications of microwaves in different fields. 8M b) The TE10 mode is propagated in a rectangular waveguide of dimensions a= 6cms and b= 4

cms. By means of a travelling detector, the distance between a maximum and minimum is found to be 4.55 cms. Find the frequency of a wave.

7M

Unit – II

3. a) With relevant diagrams, explain the working of an isolator constructed based on the principle of Faraday rotation.

7M

b) Derive the S – parameters of a E – H plane (Hybrid or Magic) tee.

8M

4. a) Explain the operation of an H – plane tee and derive its S – parameters. 8M b) What is a directional coupler? What are the properties of a ideal directional coupler?

What are parameters used measure the performance of a directional coupler? 7M

Unit – III

5. a) With neat diagram explain the working principle of a high gain (> 40 dB), low noise, wide band microwave amplifier.

7M

b) Explain the working of Reflex klystron using neat sketches. Using mode curves explain why the output power decreases as repeller voltage increases.

8M

6. a) Discuss the limitations of conventional vacuum tubes at microwave frequencies. 5M b) An identical two cavity klystron amplifier operates at 4GHz with V0 = 1kV, I0 = 22mA,

cavity gap = 1mm and drift space = 3cm. If dc beam conductance and catcher cavity total equivalent conductance are 0.25 X 10 -4 mhos and 0.3 X 10-4 mhos respectively, calculate: i. The beam coupling coefficient ii. Dc transit angle in the drift space iii. The input cavity voltage magnitude for maximum output voltage and voltage gain iv. Efficiency, neglecting the beam current

10M

Cont…2

::2::

Unit – IV

7. a) Derive Hull cut – off magnetic and Hull cut – off voltage equations in a cylindrical magnetron system.

8M

b) Magnetron has the following parameters: inner radius = 0.15m, outer radius = 0.45 m, magnetic flux density = 1.2mWb/m2, determine the Hull cut-off voltage, cyclotron frequency and the Hull magnetic flux density if the beam voltage is 6000 V.

7M

8. a) Derive the Ridley – Watkins – Hilsum inequality equation and comment on it. And also state the criteria for semiconductors to exhibit negative resistance.

8M

b) An X – band pulsed cylindrical magnetron has the following operating parameters: Anode voltage = 26KV, Beam current = 27A, Magnetic flux density = 0.036Wb/m2, radius of the cathode cylinder = 5cm, radius of anode = 10cm. Calculate the following: i. Cyclotron angular frequency ii. Cut – off magnetic flux density for a fixed anode voltage iii. Cut – off voltage for a fixed magnetic flux density

7M

Unit – V

9. a) How are microwave measurements different from low frequency measurements? 5M b) Describe the measurement of impedance using:

i. Slotted line method ii. Reflectometer

10M

10. a) With the help of neat block diagram, explain how high VSWR (>20) is measured using double minima method.

8M

b) Two identical 30 dB directional couplers are used to sample incident and reflected power in a waveguide. VSWR=2 and the output of the coupler sampling incident power=4.5 mW. What is the value of reflected power?

7M




(Regulations: VCE-R11) DATABASE MANAGEMENT SYSTEMS



Unit – I

1. a) What is logical data independence and why is it important? 7M b) Describe the terms entity and entity set with suitable examples.

8M

2. a) Scrooge wants to store information (names, addresses, descriptions of embarrassing moments, etc..) about many ducks on his payroll. Not surprisingly, the volume of data compels him to buy a database system. To save money, he wants to buy one with the fewest possible features, and he plans to run it as a stand-alone application on his PC clone. Of course, Scrooge does not plan to share his list with anyone. Indicate which of the following DBMS features Scrooge should pay for; in each case, also indicate why Scrooge should (or should not) pay for that feature in the system he buys: i. A security facility ii. Crash recovery iii. A view mechanism iv. A query language

8M

b) A company database needs to store information about employees (identified by ssn, with salary and phone as attributes), departments (identified by dno, with dname and budget as attributes), and children of employees (with name and age as attributes). Employees work in departments; each department is managed by an employee; a child must be identified uniquely by name when the parent (who is an employee; assume that only one parent works for the company) is known. We are not interested in information about a child once the parent leaves the company. Draw an ER diagram that captures this information.

7M

Unit – II

3. a) Define a JOIN operation. Explain any of its two types with an example. 5M b) Consider the following relational schema containing Airline reservation.

FLIGHTS(flno, from, to, distance, deptime, arrtime) AIRCRAFT(aid, aname, cruising range) CERTIFIED(cid, aid) EMPLOYEE(eid, ename, salary) Implement the following queries using relational algebra: i. Find the aid's of all aircraft that can be used on non-stop flights from HYD to NDLHI ii. Find the eid's of pilots certified for BOEING aircraft. iii. Identify the flights that can be piloted by every pilot whose salary exceeds 10000

Cont...2

10M

:: 2 ::

4. a) Explain the syntax of ALTER & DROP with an example. 5M b) For the relational schema given in the question 3(b) implement the following SQL

queries i. Find the eid's of employee who makes the highest salary ii. Find the eid's of employee who is certified for the largest number of aircraft iii. Find the total amount paid to employee as salaries

10M

Unit – III

5. a) Discuss the different anomalies in handling the databases. 7M b) Given the database schema R(a, b, c), and a relation r on the schema R, write an SQL

query to test whether the functional dependency b c holds on relation r. Also write an SQL assertion that enforces the functional dependency. Assume that no null values are present.

8M

6. a) Explain the 1NF and 2NF with an example. 8M b) Explain the 3NF and BCNF with an example. 7M

Unit – IV

7. a) What is a transaction? In what ways is it different from an ordinary program (in a language such as Procedural Language/Object Oriented Programming Language)?

5M

b) Consider the following actions taken by transaction T 1 on database objects X and Y: R(X), W(X), R(Y), W(Y) i. Give an example of another transaction T2 that, if run concurrently to transaction

T without some form of concurrency control, could interfere with T1. ii. Explain how the use of Strict 2PL would prevent interference between the two

transactions. iii. Strict 2PL is used in many database systems. Give two reasons for its popularity.

10M

8. a) What is the difference between a system crash and a media failure? 7M b) Consider the following classes of schedules: serializable, conflict-serializable, view-

serializable, recoverable, avoids-cascading-aborts, and strict. For each of the following schedules, state which of the preceding classes it belongs to. If you cannot decide whether a schedule belongs in a certain class based on the listed actions, explain briefly: i. T1: R(X), T2: R(X), T1: W(X), T2: W(X) ii. T1: W(X), T2: R(Y), T1: R(Y), T2: R(X) iii. T1: R(X), T2: R(Y), T3: W(X), T2: R(X), T1: R(Y) iv. T1: R(X), T1: R(Y), T1: W(X), T2: R(Y), T3: W(Y), T1: W(X), T2: R(Y) v. T1: R(X), T2: W(X), T1: W(X), T2: Abort, T1: Commit vi. T1: R(X), T2: W(X), T1: W(X), T2: Commit, T1: Commit vii. T1: W(X), T2: R(X), T1: W(X), T2: Abort, T1: Commit viii. T1: W(X), T2: R(X), T1: W(X), T2: Commit, T1: Commit

8M

Unit – V

9. a) Discuss the different types of indexes for file organization. 8M b) Explain the structure of B+ tree node with an example.

7M

10. a) Explain the first four RAID levels in detail. 10M b) Differentiate between lists of page and director of pages of heap file organization. 5M




(Regulations: VCE-R11) ENTREPRENEURSHIP

(Common to Computer Science and Engineering, Information Technology & Electronics and Communication Engineering)

Date: 06 June, 2015 Time: 3 hours Max Marks: 75


Unit - I 1. a) Explain the characteristics of entrepreneurship. 8M b) Explain the role of entrepreneurship in the economic development of a country.

7M

2. a) Write a short note on Ethics and social responsibilities of an entrepreneur. 6M b) Mention barriers to entrepreneurship. Explain. 9M

Unit - II 3. a) Mention central and state government institutions providing support to Small Scale

Industries. 7M

b) Write note on: i. Small Industries Development Organization (SIDO) ii. Small Industries Development Bank of India (SIDBI)

8M

4. a) Explain various functions of DIC. 8M b) Explain the role of MSMEs in economic development of a country. 7M

Unit - III 5. a) Explain the profile of any four Indian women entrepreneurs. 10M b) Explain the characteristics of women entrepreneur.

5M

6. a) Explain the problem faced by women entrepreneur. 7M b) Explain the role and importance of women entrepreneurship. 8M

Unit - IV 7. a) Explain the different stages involved in project identification. 8M b) Explain project formulation in detail.

7M

8. a) Explain social cost benefit analysis. 8M b) Explain project appraisal and project financing. 7M

Unit - V 9. a) Explain the importance of feedback for entrepreneur. 8M b) Explain the significance of entrepreneurial training.

7M

10. a) Explain the importance of training for new and existing entrepreneurs. 7M b) Explain the method of designing appropriate training program to inculcate

entrepreneurial spirit. 8M




(Regulations: VCE-R11) BUSINESS COMMUNICATION

(Common to Information Technology & Electronics and Communication Engineering) Date: 06 June, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) Define business communication. List out the advantages of business communication to organizations.

8M

b) Explain different forms of communication. List out the characteristics of communication.

7M

2. a) Discuss the barriers to effective communication. 8M b) Discuss the objectives of communication.

7M

Unit – II

3. a) Outline the guidelines for kinesics, proxemics, language and haptics. 8M b) It is said “actions speak louder than words”. Explain the importance of this statement in

the light of non -verbal communication.

7M

4. a) Write a note on speaking and listening skills. 8M b) Non-verbal communication is often more significant than verbal communication.

Comment elaborating on various types of communication.

7M

Unit – III

5. a) What is a presentation? Discuss the elements of presentation. 8M b) Discuss the steps involved in an effective presentation.

7M

6. Elucidate the following: i. Introduction of a distinguished person to the audience ii. Vote of thanks in a program iii. Technical presentations iv. Public speaking v. Theme speech

15M

Unit – IV

7. a) What is a meeting? What are the purposes of a meeting? 8M b) Discuss the preparatory points to be taken into consideration for a meeting.

7M

8. a) What is an interview? Discuss various types of interviews. 8M b) Write a job application for the Assistant Manager’s vacancy in a Company, published in

The Hindu, dt.10-04-2015. Prepare your CV for the job.

7M

Cont…2

:: 2 ::

Unit – V

9. a) Draft a show-cause notice to an employee for leave without prior permission. 7M b) Draft an office circular stating opening of a new branch with launching of a new product.

8M

10. a) What are the different types of reports and explain. 10M b) Memo initiating transfer of an employee. 5M




(Regulations: VCE-R11) HUMAN RESOURCE MANAGEMENT

(Electronics and Communication Engineering) Date: 06 June, 2015 Time: 3 hours Max Marks: 75


Unit - I 1. a) Explain the environmental influence on Human resource management. 10M b) List out the different functions of Human resource management.

5M

2. a) Explain the factors affecting Human resource planning. 8M b) Explain the process of Human resource planning. 7M

Unit - II 3. a) What is meant by recruiting and what are the objectives of recruitment? 8M b) In recruitment, why do organizations prefer internal sources?

7M

4. a) Write elaborately on Recruitment Process. 8M b) What is meant by Employee Retention? 7M

Unit - III 5. a) Explain the difference between Training and development. 6M b) Explain the different methods of Training.

9M

6. a) Explain the evaluation of training programme. 8M b) What is career planning? Explain its different stages. 7M

Unit - IV 7. a) What are the factors influencing remuneration of employees? 8M b) What is job analysis and explain its uses?

7M

8. a) What are the internal factors that influence wage and salary administration? 8M b) What are the functions of compensation? 7M

Unit - V 9. a) Explain the meaning of Industrial relations and its characteristics. 7M b) What is Trade union? Explain its functions.

8M

10. a) Explain the causes of Grievances. 8M b) Define collective bargaining. Explain its importance. 7M




(Regulations: VCE-R11) VLSI DESIGN



Unit – I

1. a) Mention the different regions of operation of N-channel enhancement type MOSFET. Write the expression of Drain current at different regions of operation. Assume channel length modulation factor = λ.

6M

b) Calculate the threshold voltage VT0 at VSB(source to bulk voltage) = 0, for a polysilicon gate n-channel MOS transistor, with the following parameters: Substrate doping density

16 3 10 AN cm , polysilicon gate doping 20 3density 2 10 cm , gate oxide with

thickness t 500oox A , Fermi potential of the polysilicon gate = 0.55V and oxide –

interface charge 10 2density 4 10 cm .

9M

2. a) Write the voltage transfer characteristic of CMOS inverter and specify the voltage conditions for each region of operation of NMOS and PMOS in the circuit.

8M

b) With the help of circuit diagram explain the operation of basic BiCMOS inverter.

7M

Unit – II

3. a) Write the steps used in SOI CMOS process. 9M b) Give the cross section of Twin Well CMOS process of inverter and list the process steps.

6M

4. a) List some of the causes of Latch up in CMOS chips. 6M b) Explain the basic p-well process by taking the example of implementing CMOS inverter.

9M

Unit – III

5. a) Draw the circuit diagram and stick diagram for two inputs CMOS NAND – gate and also mention the colours of stick diagram.

8M

b) Briefly explain the dynamic power dissipation in CMOS inverter.

7M

6. a) Derive the expression for Fall – Time of CMOS inverter. 9M b) Write a short note on routing capacitance.

6M

Unit – IV

7. a) Draw the typical 2- input NAND and 2- input NOR gate symbolic layouts. 8M b) With an example, explain the operation of CMOS Domino logic.

7M

8. a) Explain the working of Pseudo-nMOS logic with an example. 8M b) Draw the circuit diagram and layout for the 2-input multiplexer.

Cont…2

7M

:: 2 ::

Unit – V

9. a) Explain the following terms : i. Ad-Hoc testing ii. Observability

7M

b) With an example briefly explain the Short – Circuit and Open-Circuit faults model in detail.

8M

10. a) Write short notes on Self-Test techniques. 8M b) Explain the Chip-Level Test technique in detail. 7M



(AUTONOMOUS) B. Tech VI Semester Supplementary Examinations, May/June - 2015

(Regulations: VCE-R11) DIGITAL ELECTRONICS AND MICROPROCESSORS



Unit – I

1. a) With the help of a simple block diagram, explain the functions of 5 basic units of a digital computer.

5M

b) Represent the following in both canonical max-term and min-term forms in decimal notation. i. yzyxf

ii. ))(( cbbaf

4M

c) Convert the following numbers (11011.101)2 = ( )16 = ( )10 (125.75)10 = ( )2 = ( )16 = ( )8

6M

2. a) Convert the following numbers (125)8 = ( )10 = ( )2 = ( )16 (100111.1010)2 = ( )8 = ( )10 (7ABC.AB)16 = ( )2 = ( )10

6M

b) Prove that NAND gate is an universal gate. 5M c) Find the 2’s complement of the following numbers.

i. -25 ii. -125

4M

Unit – II

3. a) Identify all the prime implicants and essential prime implicants of the function using Karnaugh maps. f(a,b,c,d) =∑ (0,1,2,5,6,7,8,9,10,13,14,15).

8M

b) Implement the following Boolean function using 8:1 multiplexer. F(A,B,C,D) = A’BD’+ ACD + B’CD +A’C’D.

7M

4. a) Find all the prime implicants of the function f(a,b,c,d) = П(0,2,3,4,5,12,13) + Пd(8,10) using the Quine-Mccluskey method.

8M

b) Implement following Boolean functions using 3:8 decoder and external gates. i. F1(A,B,C) = ∑m (1,3,5,7) ii. F2(A,B,C) = ∑m (2,3,6,7)

7M

Unit – III

5. a) What is a T flip flop? Show its symbol and draw truth table for negative edge triggered T flip flop.

8M

b) Design a 4 bit binary ripple up-counter using positive edge triggered D flip-flops without a count enable line.

Cont…2

7M

:: 2 ::

6. a) Configure a 4-bit ring counter using a universal shift register. 8M b) Briefly explain the negative edge triggered D-flip-flop.

7M

Unit – IV

7. a) Explain the memory read operation for a 8085 microprocessor. 7M b) Write short notes on the following registers:

i. flag register ii. Program counter (PC) iii. Stack Pointer (SP)

8M

8. a) Explain the 8085 microprocessor pinout and signals in detail. 10M b) Explain the functions of arithmetic and logic unit in 8085 microprocessor.

5M

Unit – V

9. a) Explain the process of data transfer from the peripheral to the system memory under the DMA Controller.

8M

b) Write short notes on mode0 operation of 8255 Programmable Peripheral Interface.

7M

10. a) Draw the block diagram of 8255(PPI) and explain the following with respect to 8255. i. Control word register ii. In brief 8255 in different modes

10M

b) Why DMA is required? Draw the scheme to explain Direct memory Access operation. 5M




(Regulations: VCE-R11) AIR POLLUTION AND CONTROL METHODS



Unit – I

1. a) Define Air pollution. Explain point source, area source and line source with respect to air pollutants.

8M

b) What is acid rain? What are the causes for acid rain? What are the effects of acid rain?

7M

2. a) What is meant by smog? Discuss its causes and effects. 8M b) Differentiate between:

i. Primary pollutant and secondary pollutant ii. Stationary source and mobile source

7M

Unit – II

3. a) Explain control of gaseous contaminants by combustion process. 8M b) Explain control of Sox emission using extraction of sulphur from fuels.

7M

4. a) Discuss the role of wind direction and speed in dispersion of air pollutants. 7M b) Explain secondary meteroligical parameters influencing air pollution.

8M

Unit – III

5. a) Discuss about Atmospheric stability. 8M b) Mention the meteorological variables of the atmosphere and write short notes on

humidity measurement.

7M

6. a) How do you estimate plume rise? 8M b) Write short notes on:

i. Humidity ii. Precipitation

7M

Unit – IV

7. a) List out advantages and disadvantages of cyclones. 8M b) List out the following:

i. The objectives of using air pollution control equipment ii. Types of collection equipment for aerosols

Cont…2

7M

:: 2 ::

8. a) Explain control of air pollution by process changes. 8M b) What are the filter cleaning methods and describe shaking mechanism of Bag house fabric

cloth filter?

7M

Unit – V

9. a) Define Emission standard and explain emission standards for Mobile source and stationary source

8M

b) Discuss various factors to be considered for environment management.

7M

10. a) Discuss any two methods for monitoring nitrogen oxides and state their limitations. 8M b) Define air quality standards and explain ambient air quality standards and other air

quality standards. 7M




(Regulations: VCE-R11) COMPOSITE MATERIALS (Aeronautical Engineering)

Date: 06 June, 2015 Time: 3 hours Max Marks: 75


Unit – I

1. a) What are advanced composites? Mention the roles of their constituent materials. 6M b) Discuss in brief the classification of composites based on reinforcing material. 5M c) Explain the terms Specific Strength and Specific Stiffness with examples.

4M

2. a) Discuss the advantages and limitations of composite materials over conventional materials.

8M

b) In brief discuss the types of continuous and discontinuous reinforcements.

7M

Unit – II

3. a) Enumerate dispersion strengthened composites in brief. 7M b) Suggest the methods of improving the mechanical properties of the fiber in Glass fiber

reinforced composites.

8M

4. a) What is the basic principle used in fibre reinforced composites? 7M b) Discuss the processing and properties of Aramid fibres.

8M

Unit – III

5. a) Discuss the factors that will be considered while selecting a manufacturing method for producing PMC’s.

5M

b) Differentiate Bulk Moulding compound from Sheet moulding compound. 5M c) What are bags used in bag moulding? What characteristics they must exhibit?

5M

6. a) With neat sketches explain how pultrusion can be used to produce constant cross sectional profiles of PMC’s.

8M

b) What is structural reaction injection moulding? In what way it is different from Resin transfer moulding? Explain

7M

Unit – IV

7. a) For producing near- net shape a low cost MMC’s explain the Technique involved. 10M b) In what way C-C composites are superior to other composites? Explain

its application in brief.

5M

8. a) Explain chemical vapour deposition method of synthesizing of C-C composites. 10M b) With a neat sketch explain melt stirring (casting) method of producing MMC’s and state

its limitations. 5M

Cont…2

:: 2 ::

Unit – V

9. a) Derive the equation for finding the Modulus and strength of Composite under Iso-Stress condition stating the assumptions made.

8M

b) Using weight or volume fractions, prove that ρc = ρtVt+ ρmVm.

7M

10. a) Explain the composite material with a neat sketch when it is under stressed condition. 7M b) Calculate the longitudinal modulus and strength of a unidirectional composites

containing 65% by volume of carbon fibres (E1f = 294 GPa, σ1f = 5.6 Gpa) in a toughened epoxy matrix (Em= 3.6GPa, σmu = 105MPa). Compare these values with the experimentally determined values ofE1= 162 GPa, σ1u= 2.94 GPa).

8M




(Regulations: VCE-R11) FATIGUE AND FRACTURE MECHANICS



Unit – I

1. a) Discuss stress concentration due to holes and notches with simple sketches 6M b) Explain briefly the following:

i. Effect of loading on Endurance limit ii. Effect of Size on Endurance limit iii. Effect of surface finish on Endurance limit

9M

2. a) Explain with sketch “GOODMAN” method for combination of stresses and how it is useful in design.

8M

b) A bar of circular cross-section is subjected to alternating tensile force varying from a minimum of 200 kN to a maximum of 500 kN. It is to be manufactured of a material with an ultimate tensile strength of 900 MPa and an endurance limit of 700 MPa. Determine the diameter of bar using safety factors of 3.5 related to ultimate tensile strength and 4 related to endurance limit and a stress concentration factor of 1.65 for fatigue load. Use GOODMAN STRAIGHT LINE as basis for design.

7M

Unit – II

3. a) Explain High cycle fatigue citing one example. 7M b) With neat sketches explain cyclic strain hardening and softening in the case of Low Cycle

Fatigue.

8M

4. a) With neat sketches distinguish between constant amplitude and variable amplitude loading. Explain how variable amplitude fatigue loading is assessed.

8M

b) With a neat sketch explain Rainbow cycle counting technique.

7M

Unit – III

5. a) Explain Time-Dependent crack growth and damage tolerance. 8M b) Explain the various conditions for crack to grow and under what condition crack growth

become critical.

7M

6. a) Explain with sketch Brittle Fracture and Ductile Fracture with sketches of stages of failure. 8M b) Explain Griffith‘s analysis and obtain the equation for released energy(G/ER).

7M

Unit – IV

7. a) Distinguish between Stress Intensity Factor and Fracture toughness and elaborate on the factors that influence Stress Intensity Factor and Fracture toughness.

7M

b) Write the expressions for the stress field and displacement field near the crack tip for Mode I fracture in a large plate containing an edge crack subjected to far field tensile stress assuming that Linear Elastic Fracture Mechanics conditions prevail.

Cont…2

8M

:: 2 ::

8. From Fig.1 given below calculate the following: i. Write the expressions for the stress field and displacement field near the crack tip for

Mode I fracture in a large plate containing an edge crack subjected to far field tensile stress assuming that Linear Elastic Fracture Mechanics conditions prevail.

ii. State at least assumptions for the application of Linear Elastic Fracture Mechanics. iii. Predict the failure mode and load of the cantilever beam of thickness 5 mm as indicated

below: Assume the fracture toughness and yield stress as 30 MPa m and 300 MPa. iv. What is the failure mode if the yield stress is 400 MPa? Assume nominal stress at the crack as M/Z where M is the bending moment and Z is the section modulus = 400 mm3. SIF for the edge crack is KI = 1.12 a

15M

Fig.1

Unit – V

9. Explain in details the application of composite materials in Automobile and Aerospace sector with reference to fracture mechanics.

15M

10. a) Explain the different conditions that can cause the failure of a structural component. 7M b) Explain Safe -life and Fail-Safe design and Importance of fracture mechanics in

Aerospace structure. 8M




(Regulations: VCE-R11) ENVIRONMENTAL ENGINEERING-I

(Civil Engineering) Date: 06 June, 2015 Time: 3 hours Max Marks: 75


Unit - I 1. a) What are the factors affecting per capita water demand? 8M b) Predict the population for the years 1981, 1991, 1994, and 2001 from the following

census figures of a town by Geometric Progression Method:

Year 1901 1911 1921 1931 1941 1951 1961 1971 Population: (Thousands) 60 65 63 72 79 89 97 120

7M

2. a) Write about fluctuations of rate of demand. 8M b) Write notes on fire flow demand. 7M

Unit - II 3. a) With a neat sketch explain jar test for determining optimum dosage of coagulant. 8M b) What do you mean by disinfection of water? A municipal water treatment plant of design

capacity 250 MLD is using bleaching powder as disinfectant which contains 22 % available chlorine. The chlorine dosage is 1.4 mg/l. Calculate the daily requirement of bleaching powder

7M

4. a) Differentiate between slow sand filter and rapid sand filter. 8M b) Design a set of circular sedimentation tank to treat 5 MLD of water. Detention period may

be taken as 2 hrs. Assume depth of tank as 3m. 7M

Unit - III 5. a) Write notes on characteristics of domestic sewage. 7M b) 6 ml of wastewater is diluted to 300 ml distilled water in standard BOD bottle. Initial DO

in the bottle is determined to be 8.5 mg/l. DO after 5 days at 200C is found to be 5 mg/l. Determine BOD 5 of wastewater and compute the ultimate BOD.

8M

6. a) Write about catch basins and draw a labeled sketch of catch basin. 8M b) What are inverted siphons? Mention its application.

7M

Unit - IV 7. a) What do you understand by physical unit operations? Write a note on application of

various physical unit operations employed in wastewater treatment. 7M

b) Explain with the help of a flow diagram, various processes employed in conventional wastewater treatment.

8M

8. a) Explain the working of an oxidation pond with a neat sketch. 7M b) Design trickling filter units for treating 5 million liters of sewage per day. The BOD of the

sewage is 150 mg/l. Assume the value of organic loading as 1500 kg/hectare/day, depth of filter as 2 m and diameter of filter as 40 m.

8M

Cont…2

::2::

Unit - V 9. a) Explain a grit chamber with the help of a neat sketch. 7M b) Describe the Hardy cross method of pipe design.

8M

10. a) Write about the design considerations of septic tanks. 8M b) What are the factors affecting septic tank performance? 7M

Documents

VARDHAMAN COLLEGE OF ENGINEERING · working of leaky bucket algorithm with a neat diagram. 7M b) Consider the following subnet diagram, here the distance vector routing is used and