(DEE 411) - anucde.info · (DEE 411) B.Tech. DEGREE ... Derive an expression for the total power in a three phase system in terms of the ... Critical clearing angle. ——————

(DEE 411)

B.Tech. DEGREE EXAMINATION, MAY 2012.

(Examination at the end of IVth Year First Semester)

Electricals and Electronics Engineering

Paper I — INDUSTRIAL MANAGEMENT

Time : Three hours Maximum : 75 marks

Answer Question No. 1 compulsory and any FOUR from the remaining.

All questions carry equal marks.

1. Write short notes on

(a) Management Science. (b) Personnel Functions. (c) Partnership.

(d) OC curve. (e) Source Selection.

2. What are the techniques employed in the management of inventory?

3. Explain the principles of scientific management and joint stock company.

4. Write short notes on

(a) Simple interest. (b) Compound interest. (c) Uniform gradient series.

5. Explain the straight line method and declining balance sheet.

6. Define production systems? Explain the product analysis and quality control.

7. Explain the following

(a) Single and double sampling (b) Reliability.

8. Explain the procurement methods and ABC analysis.

9. Write short notes on.

(a) Functions of marketing. (b) Channels of distribution.

————————

(DEE 412)


(Examination at the end of Fourth Year First Semester)


Paper II — POWER SYSTEMS OPERATION AND CONTROL


Answer Question No. 1 compulsorily. (15 × 1 = 15)

Answer ONE question from each Unit. (4 × 15 = 60)

1. Write short notes on:

(a) Define incremental production cost.

(b) What are the units of heat rate curve?

(c) What are the assumptions of Bmn coefficients?

(d) Write three unit plant system B- coefficient equation.

(e) What are the current distribution factors?

(f) Define area control.

(g) What is the range of time constant Tt.

(h) What is the improvement of Dynamic Response?

(i) What is the function of flyball speed governor is load frequency control?

(j) What is the relation between KE and speed of the generator?

(k) In dynamic response, what are the specifications are taken?

(l) Explain excitation systems.

(m) Write the schematic diagram of TCR.

(n) What are the advatages of STATCOM?

(o) Explain dispatch training simulator.

UNIT I

2. Explain the following terms with reference to power plants

(a) Heat input - power output curve

(b) Heat rate curve

(c) Incremental input, generation cost.

Or

3. (a) Discuss and define the loss formula coefficients.

(b) Consider the following three incremental cost (IC) curves.

2

111 )(250100 ICICPG −+−=

2

222 )(5.260150 ICICPG −+−=

2

333 )(81.14080 ICICPG −+−=

Where IC’s are in Rs. 1 Mwh and PG’s are in Mw. The total load at a certain hour of the

day is

400 Mw. Neglect transmission loss and final optimum values of generation i.e.

1PG , 2PG and 3PG .

UNIT II

4. (a) Explain the necessity of maintaining a constant frequency in power system

operation.

(b) Derive the model of a speed governing system and represent it by a block diagram.

Or

5. (a) Obtain the dynamic response of load frequency control of isolated power system for

first order approximation.

(b) Obtain the dynamic response of load frequency controller with and without

integral control action.

UNIT III

6. (a) Describe the effect of Thyristor - Controlled static shunt compensators to meet

reactive power requirement in the power system.

(b) Compare the technical advantages of static compensator over synchronous

condenser.

Or

7. (a) Explain briefly about the shunt and series compensation of transmission systems.

(b) Explain with diagrams, the operations of Thyristors controlled reactor.

UNIT IV

8. Briefly explain the evolution of power system control technology.

Or

9. Write short notes on the following:

(a) Energy control center functions

(b) Power system control center dispatcher activity.

——————

(DEE 413)


(Examination at the end of Fourth Year

First Semester)


Paper III — INDUSTRIAL DRIVES




1. Write briefly on the following"

(a) Name the types of electric drives.

(b) What are the advantages of electric drive?

(c) Write the torque equation of electric drive.

(d) Why dc series motors need to be started with load?

(e) What are the classifications of load torques?

(f) Draw the schematic of current limit control of DC drives.

(g) Draw the speed torque curves of a separately excited dc motor.

(h) Explain eddy current drives.

(i) Define pole amplitude modulation.

(j) What are the components of load torques?

(k) Define pole changing of induction motors.

(l) Draw the speed-torque characteristics of DC fluent motor.

(m) Write the expression for starting current in induction motor.

(n) What are the two modes of variable frequency control?

(o) Write the expression for motor efficiency of induction motor.

UNIT I

2. (a) Briefly discuss the types of electric drives.

(b) Explain the components of electric drives.

Or

3. (a) Discuss the speed torque conventions and multi quadrant operation.

(b) Explain the modes of operation of electric drives.

UNIT II

4. (a) Explain the methods of armature control in dc motor drives.

(b) Explain the operation of single phase fully controlled rectifier control of separately

excited dc motor.

Or

5. (a) Explain the operation of Ward–Leonard schemes of dc drives.

(b) What factors limit the maximum speeds of field controlled dc motor?

UNIT III

6. (a) Discuss the operation with unbalanced source voltages and single phasing.

(b) Explain the principle and applications of variable speed and constant frequency

generation scheme.

Or

7. Write short notes on braking and transient analysis of induction motor drives.

UNIT IV

8. (a) Describe the operation and fixed frequency supply in synchronous motor.

(b) Write short notes on braking in synchronous motor drives.

Or

9. (a) What are the main features of Stepper motor which are responsible for its wide

spread use?

(b) Explain the principle operation of switched reluctance motor.

——————————

(DEE 414)




Paper IV – POWER SYSTEM ANALYSIS

AND STABILITY


Answer Question No. 1 Compulsorily. (15 × 1 = 15)


1. (a) Give the significance of single line diagram.

(b) Write the expression for per unit impedance.

(c) What is the need for load flow study?

(d) What is the need for stability studies?

(e) Define the per unit reactive of a transformer.

(f) What are the different types of buses?

(g) How are circuit breakers and load represented in one-line diagram.

(h) Distinguish between bus admittance matrix and bus impedance matrix.

(i) What are the applications of bus impedance matrix.

(j) Define bus admittance matrix of a power system.

(k) What are symmetrical components?

(l) Define zero sequence impendence of generator.

(m) Define stability.

(n) What are open conductor faults?

(o) Write the expression for critical clearing time.

UNIT I

2. (a) Define the per unit value of a quantity. How will you change the base impedance

from one set of base values to another set?

(b) A 1φ transformer is vated 110/440V, 2.5 KUA. Leakage reactance measured from

the LT side of the transformer is 0.06 Ω . Determine the leakage reactance in p.u.

Or

3. (a) Explain how a synchronous generator can be modeled as a constant voltage behind

synchronous/ transient reactance.

(b) A 120 MUA, 19.5 kV generator has 5.15 =x p.u. and its connected to a

transmission line by a transformer rated 150 MUA, 230 kV y/y with x = 0.1 p.u. If

the base to be used in the calculation is 100 MUA, 230 kV for the transmission

line, find the per unit values to be used for the transformer and generator

reactances.

UNIT II

4. (a) Explain the procedure for calculating short circuit current through Thevenius

theorem and mention the assumptions.

(b) State the load flow problem. Discuss the classification of baser.

Or

5. (a) Derive the static load flow equations using Y bus.

(b) For the transmission line with the following data, form the Bus admittance matrix.

Bus Code p-q Impedance (fpq) Line charging

y′ pq/2

1-2 0.02 + j 0.04 j 0.02

2-3 0.04 + j 0.2 j 0.02

3-5 0.15 + j 0.4 j 0.025

3-4 0.02 + j 0.06 j 0.01

4-5 0.02 + j 0.04 j 0.01

1-5 0.08 + j 0.2 j 0.02

UNIT III

6. (a) Explain the transformation of voltages and currents with the help of symmetrical

components.

(b) Draw the sequence network connection for a double line to ground fault at any

point in a power system and from that obtain an expression for the fault current.

Or

7. (a) Derive an expression for the total power in a three phase system in terms of the

sequence components of voltage and current.

(b) A synchronous generator rated at 500 KUA, 440 V, 0.1 p.u. sub-transient reactance

is supplying a passive load of 400 kW at 0.8 lagging power factor. Calculate the

initial symmetrical Rms current for a ϕ3 fault at the generator terminals.

500 KUA 400 kw

440 V pf = 0.8 lagging

x = 10 %

~

UNIT IV

8. Write short notes on the following :

(a) Steady state stability

(b) Transient stability

(c) Reactive power flow.

Or

9. Write short notes on the following :

(a) Swing equation

(b) Critical clearing angle.

——————

(DEE 415)


(Examination at the end of IV Year First Semester)


Paper V — Electrical Machine Design




1. (a) List specific magnetic loading.

(b) Define distribution factor.

(c) Define Pitch factor.

(d) Define Commutator pitch.

(e) Explain the term commutator.

(f) Explain the term interpoles.

(g) What are the main dimensions of a DC machine?

(h) Define Slip of induction motor.

(i) How is slipring motor is started?

(j) Define efficiency.

(k) How the induction motor can be designed for best power factor?

(l) How to calculate of pole winding in Synchronous machines?

(m) What are the two types of poles used in salient pole machine?

(n) Write the expression for output equation of a Synchronous machine.

(o) Write the expression for output equation of a indication motor.

UNIT I

2. (a) Derive the expression for emf generated in a dc machine.

(b) Derive the expressions for main dimensions of a DC machine.

Or

3. (a) Write short notes on Design of Armature windings.

(b) Explain the design of field System.

UNIT II

4. (a) Derive the expressions for output equation of a transformer.

(b) Briefly discuss the importance and calculation of main dimensions for 3 phase

transformer.

Or

5. Write short notes on the following

(a) Yoke design and coil design (b) Design of tank with tables.

UNIT III

6. Explain the following

(a) Stator design for squirrel cage induction motor.

(b) Rotor design for squirrel cage induction motor.

Or

7. (a) Derive the expression of output equation of a Induction motor.

(b) Estimate the main dimensions, air gap length, stator slots stator turns/phase and

cross sectional area of stator and Rotor conductors for a 3ϕ , 110 kw, 3300v, 50 Hz,

10 poles, 600 rpm induction motor Bav = 0.48 Wb/m2, ac=28000, L/T=1.25

n = 0.9, pt = 0.86.

UNIT IV

8. (a) Briefly discuss the advantage of computer aided design.

(b) Explain the flow chart for computer aided design.

Or

9. (a) Derive the expressions for main dimensions of salient pole alternators.

(b) Explain the Design of rotor for cylindrical rotor alternor.

——————————

(DEE 416/B)




Paper VI — HVDC TRANSMISSION


Answer Question No. 1 Compulsorily. (15 × 1 = 15)


1. Write briefly on the following :

(a) Write the block diagram of HVDC system.

(b) Give any four disadvantages of DC transmission.

(c) Draw the schematic of monopolar link configuration.

(d) Explain the DC switch gear.

(e) Define the energy availability.

(f) Define short circuit ratio.

(g) Define the peak inverse voltage.

(h) Explain the DC circuit breaker.

(i) List the basic firing schemes.

(j) Give any four advantages of firing angle control.

(k) What are the main functions of smoothing reactors?

(l) Write the block diagram of pulse width control.

(m) Explain the static VAR systems.

(n) Define pulse number.

(o) Define order of Harmonics.

UNIT I

2. (a) Explain modern trends in DC transmission.

(b) With neat sketches explain the different kinds of DC links available.

Or

3. (a) Discuss the technical details of HVDC projects in India in detail.

(b) What are the different applications of DC transmission system? Explain them in

detail.

UNIT II

4. (a) Obtain a relation between firing angle and power factor angle in a three phase

bridge rectifier.

(b) A 6 pulse bridge inverter is fed from 500 kV dc voltage. Find the ac voltage output

of the inverter if the advance angle is 20° and extinction angle is 10°.

Or

5. (a) Discuss the various converter faults in detail.

(b) Explain the short circuit currents in rectifier and inverter.

UNIT III

6. (a) Explain the converter control characteristics with the help of neat diagram.

(b) Explain the basic principles of DC link control.

Or

7. (a) Briefly explain the reactive power requirements in steady state.

(b) Explain the various sources of reactive power.

UNIT IV

8. (a) Obtain a mathematical model of a DC link.

(b) Explain the characteristic and uncharacteristic harmonics.

Or

9. (a) Explain the methods of reducing the harmonics.

(b) Write short notes on ‘telephone interference’.

———————–

(DEE 416/D)



First Semester)


Paper VI — FUZZY LOGIC AND APPLICATION


Answer Question No. 1 compulsorily. (15)


1. (a) What are the various Fundamental Fuzzy system concepts? (3)

(b) Explain crisp sets and membership functions. (2)

(c) What is linguistic Hedges? Explain. (2)

(d) Explain canonical rule forms. (3)

(e) What is graphical techniques inference? (2)

(f) What are the familarity relations from clustering? (3)

UNIT I

2. (a) Explain the properties of Fuzzy sets.

(b) Discuss fuzzy sets – membership.

Or

(c) Discuss the operations and properties of crisp relations.

(d) Explain tolerance and equivalence relations.

UNIT II

3. (a) Discuss Lamda – cuts for fuzzy sets.

(b) Explain defuzzification methods.

Or

(c) Explain restricted DSW algorithm.

(d) Discuss Fuzzy vectors.

UNIT III

4. (a) What are the forms of the implication operation and complicate operation.

(b) Discuss Fuzzy ruled based systems.

Or

(c) Discuss decomposition of compound rules.

(d) What is Fuzzy rule aggregation? Explain.

UNIT IV

5. (a) Explain Fuzzy Bayesian Decision method.

(b) What are equivalence relations? Expalin.

Or

(c) Write short notes on Hardening the Fuzzy C-partition.

(d) Write short notes on Cluster validity.

———————–––

(DEE 421)


(Examination at the end of Fourth Year Sixth Semester)


Paper I — ELECTRICAL POWER DISTRIBUTION SYSTEM ENGINEERING




1. (a) Define Demand factor.

(b) Define load factor.

(c) Define diversity factor.

(d) Define coincidence factor.

(e) What are the other names of use factor?

(f) Write the expression for efficiency of distribution transformer.

(g) Write the expression for regulation of distribution transformer.

(h) Explain how a load duration curve is platted.

(i) What are the types of basic distribution systems?

(j) Draw the single line diagram of radial type primary feeder.

(k) List out any two disadvantages of ring bus scheme.

(l) Explain the secondary banking.

(m) Define automatic circuit reclosures.

(n) Define automatic live sectionalizers.

(o) What do you mean by co-ordination of protective devices?

UNIT I

2. (a) Discuss the objectives of distribution system planning.

(b) Explain the significance of load forecasting in planning a distribution system.

Or

3. (a) Derive a relationship between the load factor and loss factor.

(b) Explain the typical features of distribution systems.

UNIT II

4. Write short notes on the following:

(a) Distribution factors.

(b) Use of monograms for obtaining efficiency.

Or

5. Explain the following:

(a) Sub-station bus schemes

(b) Determine optimum location of sub-station.

UNIT III

6. Discuss the design considerations of radial primary distribution feeders with special

emphasis on voltage levels and feeder loading.

Or

7. (a) Explain the basic design practice of the secondary distribution system.

(b) Explain the coordination procedure recloser and fuse.

UNIT IV

8. (a) Explain the differences between a three phase balanced and non-three phase

primary live.

(b) Derive the expression for voltage drop and power loss for uniformly radial type

distribution load.

Or

9. Prove that the power loss due to load current in the conductors of the two-phase three

wire lateral with multigrounded neutral is approximately equal to 3.625 times larger

than the one in the equivalent three phase lateral.

———————–––

(DEE 422)




Paper II — HIGH VOLTAGE ENGINEERING




1. (a) Define impulse voltage.

(b) Define impulse puncture voltage.

(c) Define Impulse Ratio for flash over.

(d) Define the term chopped wave.

(e) Draw the schematic of voltage doubler circuit.

(f) What are the requirements of a sphere gap for measurement of high voltages?

(g) What are the disadvantages of sphere gap for measurements?

(h) What is the function of high speed oscilloscope?

(i) Which techniques are used for testing of transformers?

(j) Which types of faults occur is HV measurement?

(k) Explain the business.

(l) What are the conditions for testing of insulators?

(m) Explain the sphere gap.

(n) What is Tesla Coil?

(o) Define Resonant transformers.

UNIT I

2. Draw a neat exact equivalent circuit of an impulse generator and indicate the

significance of each parameter being used.

Or

3. (a) Draw a typical impulse current generator circuit and explain its operation and

application.

(b) Derive an expression for voltage efficiency of a single stage impulse generator.

UNIT II

4. (a) Draw a neat schematic diagram of a generating voltmeter and explain its principle

of operation. Discuss its application and limitations.

(b) List atleast two applications of each voltage divider.

Or

5. (a) Describe the layout of high voltage lab.

(b) A generating voltmeter is required to measure voltage between 15 KV to 250 KV.

If the indicating meter reads a minimum current of 2 µ A and maximum of 35 µ A,

determine the capacitance of the generating voltmeter. Assume that the speed of

driving synchronous motor is 1500 rpm.

UNIT III

6. Explain the procedure for testing string insulator. Describe the arrangement of

insulators for performing various tests.

Or

7. Explain briefly impulse testing of power transformer. Describe various tests to be

carried out on a C.B.

UNIT IV

8. Explain the finite difference method and finite element method.

Or

9. Explain the charges simulation methods and Boundary element methods.

———————

(DEE 423)


(Examination at the end of IVth Year Sixth Semester)


Paper III— COMPUTER AIDED POWER SYSTEM ANALYSIS


Answer Question No. 1 is compulsorily. (15 × 1 = 15)


1. (a) Define Co-tree.

(b) Define primitive network.

(c) Define basic loop incidence matrix.

(d) Define cutset.

(e) Explain singular transformation.

(f) What are sequence networks?

(g) Define symmetrical fault.

(h) What are the applications of short circuit analysis?

(i) How do short circuit occur on a power system?

(j) State Newton –Rapson load flow formula.

(k) How is the Swing bus selected in a load flow study.

(l) What are the applications of a load flow analysis?

(m) What is Jacobian matrix.

(n) Define voltage-controlled bus.

(o) Write down the expression for the kinetic energy of the rotor at synchronous speed

in MJ.

UNIT I

2. For the network of fig, the impedances are as follows.

Element Impedance

1 j0.4

2 j0.25

3 j0-1

4 -jo.2

5 j0.5

6 j0.3

7 j0.2

Obtain Ybus, Ybv and Z loop by singular transformations.

Or

3. (a) Derive the network performance equation.

(b) Obtain the equation for Ybus in terms of Bus incidence motion.

UNIT II

4. Develop the fault admittance matrix in phase and sequence component form.

Or

5. Define the three – phase network elements for

(a) Balanced System. (b) Unbalanced System.

UNIT III

6. (a) Define and explain the power flow problem.

(b) Merits and demerits of using polar and rectangular co-ordinates is load flow

studies.

Or

7. (a) Explain the necessity of load flow studies in power systems.

(b) Draw a flow chart for load flow solution using NR method with all types of uses in

the system.

UNIT IV

8. (a) Define

(i) Steady state stability limit.

(ii) Dynamic state stability limit.

(iii) Transient state stability limit.

(b) List the assumptions made in the transient stability solution techniques.

Or

9. (a) Derive the Swing equation, What are the uses of during curve?

(b) Give classification of buses in load flow studies.

——————————

(DEE 424 A )

B.Tech. DEGREE EXAMINATION, MAY 2012


Electrical and Electronics Engineering

Paper IV — EMBEDDED SYSTEMS AND VLSI


Answer Question No. 1 compulsorily. (15)


1. (a) What are the challenges faced in designing an embedded system? (1)

(b) When do we need on RTOS? (2)

(c) What do you mean by red-lime? (2)

(d) What is trade-off? (2)

(e) When do we need multishaking OS? (2)

(f) What is the advantage of E-Beam mask? (2)

(g) What is a twin-tub process? (2)

(h) What is propagation delays? (1)

(i) What is a wiring capacitance? (1)

UNIT I

2. (a) How does a micro controller differ from DSP?

(b) Write a short notes on pipelining.

Or

3. (a) What are the design challenges in embedded system?

(b) Explain about the role of processes reset and system reset.

UNIT II

4. (a) Explain about different scaling models.

(b) Write a short notes on inverter delay.

Or

5. (a) How sheet resistance concept applied to MOS transistors and inverters?

(b) Explain about design of long poly silicon wires.

UNIT III

6. (a) Draw the stick diagram of CMOS inverter.

(b) Write a short notes on PAL.

Or

7. (a) Explain about switch logic.

(b) Discuss about commonly used memory elements.

UNIT IV

8. (a) Explain about logic synthesis.

(b) Explain about behavioural synthesis.

Or

9. (a) Explain about parallel evolution of compilation and synthesis.

(b) Explain about reuse of intellectual property codes.

————————

(DEE 424/B)



Sixth Semester)


Paper IV — ARTIFICIAL NEURAL NETWORKS




1. (a) What is topology?

(b) What is crossover?

(c) What is training set?

(d) What is neuromorphic computing?

(e) What are the disadvantages of ANN’s?

(f) What are the various network topologies?

(g) What is post-perception?

(h) What are the characteristics of a training algorithm?

(i) What is global minimum?

(j) What is clustering?

(k) What are the application areas of ANN’s?

(l) How the ANN are useful in image processing?

(m) What is discriminant function?

(n) What is hyperplane?

(o) What is linear seperability?

UNIT I

2. (a) (i) Explain memory based learning.

(ii) Explain error correction learning.

Or

(b) (i) Explain learning with and without a teacher adaptation.

(ii) Discuss statistical learning theory.

UNIT II

3. (a) (i) Explain linear least square filters.

(ii) Discuss annealing techniques.

Or

(b) (i) Discuss Hessian matrix.

(ii) Explain cross validation network pruning techniques.

UNIT III

4. (a) (i) Discuss regularization theory and networks.

(ii) Discuss RBF networks.

Or

(b) (i) Explain covers theorem on the seperability of patterns.

(ii) Write a short notes on multilayer perceptrons.

UNIT IV

5. (a) (i) Discuss SOM algorithm.

(ii) What are the properties of feature map?

Or

(b) (i) Explain in detail about associative memories.

(ii) Discuss the applications of ANN in speech and image processing.

———————–––

Documents

(DEE 411) - anucde.info · (DEE 411) B.Tech. DEGREE ... Derive an expression for the total power in a three phase system in terms of the ... Critical clearing angle. ——————