Northern India Engineering College, New Delhi · Subject: Microwave Engineering Maximum Marks :75 ... MVI BOSH LOOP: RRC DCXB JNZ LOOP END ... Data(h): lA, 32 4 , 12. (3)

Northern India Engineering College, New Delhi






















Exam Roll No.•.••...•••••....••..•.

ENDe write your Exam Roll No.)

MAY-2010Subject: Microwave Engineering

Maximum Marks :75e question from each unit. Q.1 is compulsory.

QI (a) It is impossible to me s re h, Y, Z parameters at microwave frequencies .Why?(b) 'Transit time effect's ts limitation to the high frequency behaviour of conventional

vacuum tubes but it la s a vital role in the operation of the Klystrons. How?(c) What is slow wave t cture? Why do you need a slow wave structure in TWT

amplifier?(d) What are transit time de ices?(e) Explain different type 0 microwave filters. (5x5=25)

UNIT-IQ2 (a) How waveguides ar ifferent from two wire transmission lines? Discuss the

similarities and dissi il rities. (5)(b) An air filled rectang la waveguide of inside dimensions 7x3.5cm operates in the

dominant mode. (7.5)(i) Find the cut off fr q ency.(ii) Determine the ph s velocity of wave in the guide at a frequency of 3.5 GHz.(iii) Determine the gu'de wavelength at the same frequency.

Q3 (a) State the Maxwell's e u tions and explain their physical significance. (7.5)(b) The dominant mode s ropagating in rectangular waveguide of dimensions a=6cm,

b=4cm. The distance b tween a maxima and minimum is 4.47cm. Determine thesignal frequency at t e ominant mode. (5)

UNIT-IIQ4 (a) Explain the operatio 0 E-H plane Tee junction. Why it is referred to as Magic Tee.

Derive its scattering a rix. (5)(b) What is velocity mod la ion? How it is utilized in Klystron amplifier? (2.5)(c) A three port circular h s an insertion loss of IdB, Isolation 30dB and VSWR=1.5.

Find the scattering at'. (5)

Q5 (a) Explain the principle of icrowave circular and also write its scattering matrix. (5)(b) Why isolator is conn ct d in microwave experiment bench after microwave source? (2.5)(c) An X-band pulsed yl ndrical Magnetron has following operating parameters -

Anode voltage (Vo)=2 KV, Beam current (10)=27A, Magnetic flux density(Bo)=O.336wbjm2, R di s of cathode cylinder (a)=5cm, Radius of vane edge tocentre(b)= lOcm . co p te:- (5)(i) The cyclotron an ul r frequency. (ii)The cut off voltage for a fixed Bo.(iii)The cut off magn ti flux density for fixed Vo.

Q6 (a) Explain the operatio(b) Why Ge and GeAs i

tunnel diode?(c) For a transit time d

velocity and is equfrequency of 8GHz.

UNIT-IIIo Gunn diode with the help of two valley model. (5)t e most commonly used semiconductor material for making

(2.5)ain mode, the domain velocity is equal to the carrier drift

t lO7cmjsec. Determine the drift length of the diode at a(5)

of the power meter for low range microwave power(7.5)

measuring unknown impedance of a terminating load in a(5)

(a) Explain the princi Iemeasurement.

(b) Explain any method 0microwave system.

Q (a) What is transferre electron effect? What are the semiconductor materialcharacteristics requi ed for it to exhibit the effect? (7.5)

(b) Why PIN diodes ar ore suitable for high frequency switching applications ascompared to PN Jun ti n diode. (5)

UNIT-IVQ (a) Calculate the VSW 0 a transmission system operating at IOGHz. Assume TEIO

wave transmission in ide the wave guide of dimensions a=4cm, b=2cm. Thedistance measured b teen twice minimum power points is Imm on a slotted line. (5)

(b) Derive formula for r d range equation. Compare pulsed radar with CW Dopplerradar. (7.5)

Q

************


Exam Roll No .

RM EXAMINATION

P.T.O.

UNIT-IIdifference between a counter and time-delay? (3)e delay required to complete the execution of the

ctions. Assume that the speed of processor is(3.5)

Size2Kx81Kx8

END

DeviceROMRAM

(a) Clear accumulator u ing single instruction in four different ways. (4)(b) Draw the timing di am of instruction XHTL. (4)(c) Name the address'n mode of the following instructions. Justify your

answer- (i)PUSH p. (ii)DAA (iii)ADD M (iv)STAX 16 bit (4)(d)Which is the longe t nstruction and what is its significance? (4)(el XRAA

MVIA04HMVI BOSH

LOOP: RRCDCXBJNZ LOOPEND

What will be co nts of A after implementing the above set ofinstructions? Jus'f your answer. (4.5)

(f) An 8085 microp 0 essor is interfaced with 2Kx8ROM chip and1Kx8RAM chip h that the following address map is realized.Calculate the fold b ck memory space. (4.5)

(a) (i) Explain, wha(ii)Calculate the

following ins2MHz.

LXI H,20F HMVIA,OOHMYI B,FF

SUM:ORABDCSH

JC QUITSUB:DCRB

JNC S MQUIT: RST-5

write your Exam Roll No.)

UNIT-IQ (a) Draw the pin di gr of 8085 microprocessor and give the name of

signals associate 'th timing and control circuit and explain. (6)(b)What is bus? W a are different types of buses supported by 8085?

How the process r sends and receives information from memory andI/O devices? Exp ai . (6.5)

OR(a) Explain the nece sty of decoding when memory device is attached to

a microprocesso ? With neat diagram indicate how a simple NANDgate decoder is s d to select a 2716 EPROM memory component formemory location F800H-FFFFFH. (6.5)

(b) (i) Describe the a ·ous addressing mode of 8085 Assembly Language.(ii)Write the seq e ce of events in the execution of CALLinstruction. (6)


(6.5)8085? Explain the

(3+3)

UNIT-IVe board scan modes of 8279.i terface stepper motor withit and draw the flow-chart.

OR(a) Draw and expl' the interfacing circuit for interfacing an LED output. port with 8085 m croprocessor using absolute deco~ing technique. (6)

(b)Explain the al ent feature of a programmable communicationinterface. (3.5+3)

(a) Explain all the(b) How will you

interfacing circ

[-2-)

(b)Write an assembl anguage program to determine the number ofzeros, positive ~d n gative elements in a block of data. Assume thatlength of block is s 0 ed at memory location 2043H. (6)

OR(a) (i) Write a progra 'n 8085 to add the following data bytes stored in

memory locati n starting from 2060H and display the sum.Data(h): lA, 32 4 , 12. (3)

(ii)Write a progr . 8085 to account from 0 to 9 with a one-second9.e1ay between a h count. (3)

(b) (i) pifferentiate b t een:- (2)(A)The instruc '0 RSTOand JMP 0000(B)The action f executing the HLT instruction and asserting the

HOLD sign 1.(ii)List all mach' n cycles that 80.85 uses. Which is the longest

machine cycle. (2.5)(iii)List all instru ti ns of 8085 that can be used to read and write

data to memo apped I/O ports. . (2)I

! t! I UNIT-III

(a) Explaip Ithe inte pt process in 8085 and the difference between anon-maskable d maskable interrupt by giving examples of each. (6)

(b) Desigrt :the me 0 interface logic to interface 32Kbyte EPROMchip.IC2 is also 7 128, while IC3 is 62256, which is a 32K byte SRMchip. Th;eEPRO hips are mapped to cover the lower half of the 64Kbyte address. sp ce while the SRM is mapped to the upper half. Also,ICI maps all ev n address and IC2 maps all odd addresses 0000,0002, '0004 etc. m p to 1C 1 and address 0001, 000'3,' 0005 etc mapto IC2. (6.5)

OR(a) Explain the mo e 1 operation of 8255 with the timming diagram for

the handshake ig als as well as the control signals used by both theinput port mode d output port mode. (6.5)

(b) Explain the blo k iagram of 8255 PPI and its control word. (6)

7

Q

Q5

/

· ...•.-<1..,i

************

- \. ~--


EXllm Roll No .~

ERM EXAMINATIONTH SEMESTER B.TECH. MA y-20t 0

Subject: Computer NetworksMaximum Marks :75

compulsory. Internal choice is indicated ..

er Code: ETCS306/ETIT306me: 3 Hours

Choose the corrector best alternative in the following:- (2.5xlO=25)(a) The routing of d grams _

(i) Must follow fi ed path (ii)Occurs on a virtual Circuit(iii)Can occur 0 er different paths (iv) Occurs exponentially

(b) The RG number g' es us information about.~ _(i) All of the the 'e (ii)Optical fiber (iii)Twisted pair (iv) Coaxial cable

. (c) The __ chan e is used for application's requiring a transmissiongreater than 64 k ps. (i)B (ii) D (iii) H (iv)All of these

(d) The 'fCP sliding ndow _(i) Can be used to contro! the flow of information(ii)Always occu s hen the field value is O.(iii)Always occu hen field value is 1.(iv)Occurs horiz tally

(e) Which of the f 11 wing is considered a broad band communicationchannel?(i) Coaxial cabl ii) Fiber optics cable (iii) microwave circuits (iv)all ofabove.

(f) Bit stuffing is u(i) Pad insuffici(ii)Distinguish e inning and ending flags from information.(iii)convert 8-bi v.ords into 16 bit words.(iv)Fill a data trey

(g) I~ which topolo data packet is removed by source destination?(i) Ring (ii) B s (iii)Star (iv)None .

(h) UDP is used wi h Protocol.(i) Trivial File r sfer (ii) ICMP (iii) LDAP (iv)All of above

(i) I~ which routi g ethod, do all the, routers have a common database?(i) link vector ii) distance vector (iii) link state (iv)non of the above

UJ Which of the fo 10 'ng is a four wire Gigabit Ethernet implementation?(i) 1000base-S (ii) lOOOBase-LX (iii) lOOOBase-CX (iv) lOOOBase-T

! .~1-· I /

·>~\' "',

2 (a) What are s of the factors that determine whether acommunicatio stem is a LAN,MANor WAN? (5)

(b) Defme the te onnection-oriented as used in data, communicationand relate it to T P. (5)

(c) What are the b nefits of using layered protocols? Discuss some ofthem. (2.5)

ORQ2 (a) What is a peer t -peer process? What are heades and trailers and how

do they get ad e and removed? (5.5)(b) Discus the m d s for propagating light along optical channels with

proper diagr s. (3)(c) What do you an by network topology? Discuss the problems and

benefits of any tree topologies. (4)

P.T.O.


[-2-]

(6)

(6.5)

by multiple access communication? What is the01 ? (5.5)r tocol with special reference to frame format.' (7)

OR(a) Discuss the follo with reference to LANs.

(i) Exponential b c off algorithm (ii)CSMAjCD vs CSMAjCA(b)What is the max' m number of subnets in each case?

(i) Class A; mask 2 5.255.192.0(ii)Class B; mask 2 5.255.192.0(lii)Class C; mask 2 5.255.255.192(iv)Class C; mask 2 5.255.255.240

(a) What do, you merole of MACproto

(b) Explain Ethernet

Q4

Q4

Q3

Q3 (a) What are the vari u data link layer design issues? Explain stop-and-wait ARQ protoco 'th suitable diagrams when (i) Frame is lost (ii)ACKis lost. (7)

(b) Name different t e of HDLC frames and give a brief description ofeach. (5.5)

OR(a) Explain the enca s lation of PDUs in TCPjIP and addressing with

suitable diagrams. . (4.5)(b) How is eRC supe'o to the two-dimensional parity check? How does

the checksum h cker know that the received data unit isundamaged? (8)

.~'j

--'.'

Q (a) Explain the Ie bucket algorithm and illustrate how trafficcongestion can b r duced. (7)

(b)A routing algori should have global knowledge about the state ofthe network to p rf: rm its task. Give various goals and objective to beconsidered in ro g algorithms. (5.5)

ORQ (a) Explain the Le bucket algorithm to control congestion. Explain

how the drawbac s of this are overcome in a token bucket algorithm?(6)(b)Are both UDP an I unreliable to the same degree? Why or why not? (4)(c) Can the value of h ader length in an IP packet be less than 5? When

is it exactly 5? (2.5)

************

.~'j


riteyour Exam Roll No.) Exam Roll No .

END T EXAMINATION

.Ahinverter fabricat d by 1.2J..LmCMOS technology uses minimum possiblechannel length. If w = 1.8 J..Lrnfind the value of Wp·that,would result intw6'transistor bein atched. (5)What is difference b tween positive and negative photo resist? Whichtype of photoresist s repared for submicron technologies? (3)Discuss the effect 0 increasing Vro, n and decreasing Vro.p on noisemargin. (3)What is the effect of power supply reduction on CMOS voltage TransferCharacteristics? (2)What is output of t e (3)

ode: ETEC 308: 32308Hours MaxintuntMatks :75'

Note: Question 1;s co p Isory. Attempt one question from each unit .

(b)

(c)

(d)

1,

LV -L5'"V:3 V -IL--Jl.- (

"D

lb)

(7.5)

sequence used to construct NMOS enhancement(6)

(6.5)

What is static pow r issipation and dynamic power dissipation? Explainin detail. (5)Discuss levels of d s gn abstraction with Y-chart. (4)

Unit-IDerive the expres i n of (WIL) of pull down and pull up transistors ofinverters when dri e by pass transistor. (6.5)An NMOS transist r ith kn= 20J..LAN2 and Vr= 1.5V is operated with Vgs=5V and 10= 100 . Determine the region of operation of NMOS and findVps. (6)

Describe the proc sdevices.Consider CMOS i ve er with the following parameters.NMOS: Vro= 0.6V, J..LCox= 25 J..LAN2, (W/L)n= 8PMOS: IVrol = 0.7 , P Cox= 11 J..LAN2, (W/L)p =12Calculate Noise m r in of this circuit. The power supply voltage, Voo=3.3V

Unit-IIA CMOS inverter i aving following parameters:Vro,n = 1.0V, J..LnC x 45 J..LAN2, (W/L)n =10Vro,p = -1.2V, J..Lp0 = 25 J..LAN2

, (W/L)p=20, Voo= 5V.(i) Calculate the rise im and fall time of output signal.(ii) Determine maxim frequency of a periodic square wave input signal

attainable for full v It ge swing.

(a)

(b)

(a)

(b)

(a)

(f)

(g)

I

Q2.

03.

04.

P.T.C.


[2]

(5)

(4)

•II, .

'f~~hf. r,:!{bY ":jDraw size transi t rXOR circuit and explain its working.. L/ : !

'.1&,- ' I', .. , p' Q" "'(II) •What, is NMOS 'logic? Implement the function,..,' ,'::.'", . ' . F =!:ABCD + E( G) using pseudo' NMOS logic. If aspect ratio of all

.h·"r" . ',NMOS'transist rs is 12/7 then find equivalentW/L of pull down networkand also W/L ra io for PMOS transistors. (8.5)I .

(b) HoW¢apacitive coupling leads to cross talk? Explain in detail.: 1

II

__ p··1

Q ... (a)

(b)

Q. (a)

(b)

Unit-III

Give 'CMOS im I mentation of 0 latch using tristate inverters. Explain theop~r,tion of re ul ant circuit. (7.5)

Discuss the sc e e that implements a D Flip flop with help of 2: 1 MUX. (5)fl'

I

Explain c10ckin trategies in CMOS VLSI. (6)Explain NOR CMOS logic. What is NORA pipellned systemarchitecture? ill there be any charge sharing problem in this architecture.(6.5)

Unit-IV

(a) Discuss the m i features of sea of gates realization. (6.5)

(b) What are vari u design methoiogies. Explain the methology used fordesigning Full C stom Chip. (6)

Explain two phase and our phase logic structure.(12.5)

*********

--...~


(Pl (lSewrite your Exam Rolf No.) Exam Rolf No .

."

Q (a) Give the netwo k structure and services provided by a typicaltelecommunicati network. (3)

(b)Explain Lee grap f multistage switching network. (3)(c) What is meant y (i) Grade of service (ii) Blocking probability of a

telecommunicati network? . (3)(d) Explain the princ'p e of (i)echo suppressor (ii)echo conceller. (3)(e) What are different ding and diversity techniques in radio systems? (3)(f) Explain the dif eence between (i) circuit switching (ii) packet

switching. (4)(g) Give theprincipl Advanced Intelligent Network (AIN). (3)(h)List various type Error detection and correction codes. (3)

UNIT-IQ (a) In a 100 line Str w er exchange using 100 two-motion selectors, show

the trunking d'a ram when the subscriber 85 establishes aconnection to su s riber 58. How does the diagram change if the callis initiated by su s riber 58? (8)

(b) In a 100-line £ ld d network, how many switching elements arerequired for a no - locking operation? (2)

(c) If the noise pow r 'n a channel is 0.1 dBm and the signal power is10mV, what is th ( IN) ratio? (2.5)

Q (a) Explain the featu e of (i)centralized SPC (ii)distributed SPC. (6)(b) List the differenc s etween single stage and multistage networks. (3.5)(c) Give the princ pI of diagonal cross-bar switching matrix in

telecommunicati n networks. (3)

UNIT-IIQ (a) Explain the prin i Ie of (i) channel vocoder (ii) forment vocoder (iii)

LPC based vocod r (9)(b)Using the Lee gr p ,derive an expression of blocking probability of a

three-stage switc (3.5)

Q' Explain following of switching methods in telecommunicationnetworks:- (12.5)(a) Time-division sp c -switching(b)Time-division ti e- witching(c) Time-multiplexe s ace-switching(d)Time-multiplexe . e-switchingGive their importan £ atures and typical applications.

UNIT-IIIce between (i) In-channel signalingQ (a) Explain the diffe e

channel signalin .(b) List important

communication.communication?

features ofWhat is

Ionosphericline-of-sight

and(LOS)

(ii) Common-(6.5)

Troposphericmicrowave

(6)P.T.O.


Pleasewriteyour Exam Roll No.) Exam Roll No .

EN ERMEXAMINATION

(a) State Sampling T eorem. (4x3+4=25)(b) Find DFf of se u nce x(A}={1,1,0,0}.(c) Calculate the u ber of multiplication needed in calculation of 512

point radix 2 F hen compared to direct DFf.(d)What are the r perties that are maintained same in Transfer of

analog fIlter in 0 igital fIlter?(e) What is warpin ect?(f) What is Frunca i ?(g) Describe featur s of window function.(h) Compute linear c nvolution, circular convolution and auto creation of

xt{n)={1,2,2,2} x2(n):{1,2,3,4}.

1

IXTHSEMESTER B.TECH. MAY-20lOaper Code: ETEC312 Subject: Digital Signal Processing & Applications'me : 3 Hours Maximum Marks :75

Note: Q.1 is 0 pulsory. Attempt one question from each unit.

(6)4

UNIT-I(a) Sample the Si x(t}=1+cos2xt at its Nyquist rate and obtain its

discrete seque ce. Apply DFf for 4 samples using DITFFf also andsets its discrete m gnitude. (6.5)

(b) Compare (i) Lin Convolution & Circular Convolution(ii)Ov rl p add & overlap save. (6)

(a) (i) Find DFf 0 equence x(n}:f(n-no) (ii) Compute DFf of 3 pointssequence x( )= 2, 1,2} using same sequence compute 6 point DFTand compar e two DFT. (6)

(b) Let G(k), H(k} e enote 7 point DFf of length 7 sequence g(n) andh(n) respectivel (6.5)(i) If G(k)={l+j2, -2+j3, -1-j2, 0, 8+j4, -3+j, 2+j5}h(n)=g(n-317).Determine

H(k) without co puting DFT.(ii)If g(n}={-3.1, 2 4, 4.5, -6.1, -3, 7}, H(k)=G((k-4}7).Determine h(n)

without DFT.UNIT-IT

(a) Show that pha e delay of first order Low Pass Transfer function

A (z)=:.c dl+z-J

. s l-dJ

, 11 d2z·1 1 +dj

(b)A length a type 1 real coefficient FIR fitter has the following zeros

z, = .. 0.5, Zz = 0.3 1- 0.5, Z3 = --_! + j J3 . . (6.5)2 2

(i) Determine th I cations of remaining zero.(ii)What is tran fe function of filter?

5 (a) Design a single 0 e low pass IIR Digital fIlter with -3dB Bandwidth of0.2n using Bi Ii e transformations. (6)

(b) (i) If H(z) is LPF. S ow that H(-z}is HPF.(ii)If wp and ws re resents passband and stopband edge frequency ofH(z) . Determi e the locations of stop band and passband edgefrequency of H(- ). (6.5)

P.T.O.


[-2:']

l(1::.-;,r-II/v. '-

I

Ir2]j

gz

(6.5)ncomplete realization of the causal IIR filter having

H(z) = 3z(Sz-2) . Determine the"value of A and B.(6)(z + 0.5)(4z + I)

rtr:-'\! 7'ct;

I I'(.C2J \ I _DS

I ~

i~ __ A;LJ.~-7:; If'.

f

I

f I UNIT-ill(a) Dey~lop ~ menic direct form realization of .transfer function

H: I 3 + z - - 2z -5 d(Z)i= an then determine its transpose: J 1+3z-J + Z-2 +4z-·

corlfiguration.(b) Fig shows

Q6

(6)two All-Pass

Q7 (a) Develop a ca c ded lattice realization of Nth ordcr complex coefficientall pass tran fe function AN(z). (6.5)

2+2z-l•

H (z) :-: --- ~-- In form of parallel connection of3+z-1

UNIT-IVQ8 (a) D.etermine ad Band Range of filter characterized by

yen) = O.95y(n l)+x(n). (6)(b) Compute ro off' noise power for system given by transfer

•functions H (zI

(6.5)---,-(l-O.5z-I)(I- O.6z-')

Q9 (a) Obtain the po y

H(z)=~~1 + 5z-1

(b) Determine oupby-

hase decomposition of IIR ftlter with transfer function

(6)

t y(n) in terms of input x(n) for multirate ftlter given(6.5)

***********"


Documents

Northern India Engineering College, New Delhi · Subject: Microwave Engineering Maximum Marks :75 ... MVI BOSH LOOP: RRC DCXB JNZ LOOP END ... Data(h): lA, 32 4 , 12. (3)