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~'" Con. 6063 -10.( REVISED COURSE) '\_~'1--- GT-6696

\~( 3 Hours) @ [ Total Marks: 100

N.S. : (1) Question NO.1 is compulsory.(2) Attempt any four questions out of remaining six questions.(3) Assume suitable data wherever necessary and justify it.

1. (a) Is it logical in source coding to assign less probable symbol longer string and more 20probable ones shorter? Explain.

(b) Define error control coding. Explain code rate, code efficiency and Hamming distance.(c) Define Random Variable. Explain CDF and PDF.(d) Write a note on PN sequence generator.

2. (a) How the capacity of a White Gaussian channel is calcLJlated? Explain bandwidth-SIN trade-off for the same.

(b) A data stream to be coded is 18 repeating '1Q' starting with 1 :-(i) Show how parsing is done in LZ coding qf thi~ data.

(ii) If number of prefix used is 8, shqw how this data is encoded.(c) For binary data sequence 1011001 sketch waveforms of :-

(i) NRZ(polar)(ii) BASK

(iii) BPSK(iv) BFSK.

6

6

8

3. (a) What are Cyclic codes? Why they are called sub class of Block codes? Implement 10a (7, 4) Cyclic code encoder with g(x) =X3+ X2+1 and show that the code can begenerated for d1 = 1010 and d2 = 1011.

(b) Consider a (7, 4) systematic Block code with parity check equations :-c1 = a1 EB a2 EB a3

c2 =a1 EB a2 EB a4

C3 =a1 EB a3 EB a4

where a1' a2' a3' a4 are message bits,

C1' C2' C3 are parity chick bits.

(i) Find 'G' and 'H' matrices.(ii) Find code words for message 1101 ang {)Q11.

(iii) For the received message 110001Q, find the syndrome and hence the transmittedmessage. ..

(iv) Explain the encoder and decoder with block diagram.

10

[ TURN OVER

Con.6063-GT-6696-10. 2

4. (a) Explain ISI and ICI. What causes them? Explain how they can be overcome?(b) Explain the' QASK system w.r.t. transmitter, receiver block diagram and signal space

representation.(c) Compare MPSK and MFSK.

5. (a) Show how duobinary decoding is d'one when input {d(K)} ={O 1 ., 1 0 1 0 1 1 } is, I I I ,.' , I . .

(i)' Precoded and .

(ii) not precoded(iii) Show in each case what happens if 4th bit is detected wrongly.

(b) Expl?in QPSK with following points :- .

(i) Offset and Non-offset QPSK.(ii) Modulatton block diagram of offset QPSK.(iii) Demodulation block diagram.(iv) Power spectral density plot, signal space representation and Eucledian distance.

\.

88

4

10

10

6. (a) Derive the expression for signal to noise ratio of Integrate and Dump receiver filter. 10(b) Explain with neat block diagram, DS/BPSK system. What is processing gain and 10

jamming margin? . - .7. Write short notes on any four :-

. (a) Central limit theorem.(b) Viterbi algorithm.(c) FH spread spectrum.(d) Eye pattern.(e) Line codes.

20

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(REVISED COURSE) (5- I~bra~) GT-6684(3 Hours) [Total Marks: 100

N.B. (I) Question No.1 is compulsory. .

(2) Attempt any four questions out of remaining six questions.(3) Assume suitable data wherever required with justification.(4) Figures to the right indicate full marks.

r'4-Con No-22

Con. 6460-10.

1 (a) Explain how to interface an 8253 with 8085 microprocessor in I/O mapped I/O. 10mode. Draw memory map and interface diagram.

(b) Explain Asynchronous data communication with SFR's in 8051Microcontroller, also specify the use of Timer in serial communication.

2. (a) Draw the internal memory organization of 8051. Specify the use of bitaddressable memory with one example.

(b) Explain the software and hardware interrupts of 8051 with neat diagram.

3. (a) Give the comparison of salient features of 8051 with it's derivatives like89C51, 89C52 and 89C2052. .

(b) Explain the different Logical and Arithmetic instructions in ARM processorwith addressing mode.

. 4. (a) Define the terms Ingtruction Cycle, Machine Cycle and T state in 8085.Specify the machine cycles for following instructions. .

(i) LDA (ii) LXI (iii) INR M (iv) RRC (v) DAD H.(b) Explain the multiplexed address/data bus and different machine cycles

of 8085 with neat diagram.

10

10

10

10

10

10

10

5. (a) Write the assembly language program for 8085 to unpack the packed BCDnumber stored at memory location E002H. Store result at B004H and B005H.Also draw the flow chart for the same.

(b) with neat labeled diagram explain interfacing of LCD with 8051. Use portOfor 10Data bus and portl for control bus.

6. (a) Write the assembly language program for 8051 and draw the flow chart toAdd two 4 digit BCD numbers. Store result in DPTR register after addition.

(b) Draw and explain the register architectur~ of ARM processor in differentoperating modes.

7. Write a short note on following: ( Any four).(a) Program status register and Barrel shifter of ARM Processor.(b) External and Internal memory organization of 8051.( c) Addressing modes of 8,051.(d) 8085 Serial Communication.(f) Interfacing Hex Keyboard with 8051.(g) Interfacing 8155 with 8085.

10

10

10

20

TG-{ E-1eX.j s~-vl f2-ev/ SH2o)O= 140 p3-ksl-upq-Sec Half-KI -9-1 0

Jvtte ','2-q11f/ '°

N.B.: (1)(2)(3)

sub ~, -'bb(REVISED COURSE) -

(3 Hours)

Question NO.1 is compulsory.Solve any four from question 2 to 7.Assume suitable data if necessary.

GT -6687

[Total Marks: 100

. Con. 6015-10.

1. (a) State and explain Gauss's law.(b) Explain current and current density.(c) Explain lossless propagation.(d) State and explain Poynting theorem.

~\'ort~~

- 1 .2. (a) A vector field in spherical is given by F = "3 (2 Cos 0 ax + Sin 0 ao)' 10r

Express f=in Cartesian coordinates at each points. (i) (1, 0, 0) ; (ii) (0, 0, 1)

& (iii) (-J2 , 0, 1) .

(b) A vector field is given by A (r, d, z) = 30e-r ar - 23az verify divergence theorem 10for the volume enclosed by z =2, z =0 and z = 05.

3. (a) Explain physical sign'ificance of displacement current. 10(b) The circular loop conductor lies in the z = 0 plane, has uniform redious of 10

0.1m and resistance of 5.0n given e =0.20 sin t 103 t 83' determine currentin the loop.

4. (a) Prove that electromagnetic wave E.A =0 and E x R is haveing the direction 10of propagation of wave.

(b) A medium has following parameters Jlr = 10 r1t = 2.5, (j = 10-4 mho/mDetermine a, e, A, V, 11for 1GHz

10

5. (a) Explain reflection of uniform plane wave at normal incidance.(b) Explain pulse broadcasting in dispossive media.

1010

6. (a) Derive the general wave line equation for transmission line.(b) Write short notes on ;-

(i) Voltage standing wave ratio(ii) Wave reflection at discontinuities.

1010

7. (a) Explain sources of EMI and their effects.(b) What is need of Electromagnetic compability.(c) Explain Divergence theorem.

1064

-------------

~~j Hours)

1 (;' EI-fIC ~,-v 5Llb/' ('\55 \ \N.B.: (1) QuestionNo.1 is compulsory. S t1fl.-l{O

(2) Attempt any four questions out of remaining six questions.(3) Assume any suitable data wherever required but justify the same.

[Total Marks: 100

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I'

I

~ L2.. -t::

Q.2.a I Sketch X{t) if,

x (t ) = r ( t + 4) - r (t + 2) - r(t + 2) .Hence obtain

X(2t+2)Q.2.b I Convolve the following signals.

1,0

10

EL0 1 t

h(-i:-)

J-3

- \ -t.

Q.3.a I Determine the step response of the system whose I 08

impulse response is h (t ) = e -tu (t )Q.3.b IA system has state equation ~s

[XI~t )

]=[-~ ~3] obtain the tr~nSfer function.

X2(t)

12

--- ~

Sr.No Questions Marks

Q.1 Answer any four Questions.Q.1.a State and explain the physical significance of scaling 05

property of Fourier Series of C.T. SiQnalQ.1.b Determine, whether following signal is periodic or non- 05

periodic.

X (t ) = 2 sin G t ) +4 cos G t ) + 4 cos ( t - 7r )

Q.1.c Classify the following system on the basis of stability 05and causality." ,y (t) - 2t Y (t) = x ( t)

a.1.d Explainthe relationshipbetweenFouriertransform and 05Laplace Transformof a sk:mal.

IQ.1.e Obtain the cross correlation of X (t ) & h(t) 05

l a.4.a I Find the Fourier series of the following signal.

fC\.9€'" '2-

aA.b

a5.a

a5. ba.5.c

a.6.a

! 12 J

-T -~z- -r::.../z- ..,...

Obtain the Fourier. Transform of the signal shown I 08below.

.1-

/ . ...J Iii I- 2. -1. b .1 '.2..

. .. ..::::..

,Find the Fourier transform of the gate function and 110draw the spectrum.

6

.......

~

a.6.b Describe the different random rocesses.a.7.a The differential equation of the system is given as

1210

.. .y ( t ) + 3y (t ) + 2y( t ) = x (t )

Withx(t) = 4e-2t and y(t}= 4Determine the total response of the system.

a.7,b 10Obtain the invers~ Laplace Transform of

X(S) = 4I (S+1)(S+2)3For all possible regi6n of convergence.

- - - - - - ----

rre t' (, V (3 Hours)

.. ~.ff ~O'c)/ ~L(b/"" L1-,C.D3\'f)..\tDN.S.: (1) Question No.1 is compulsory.

, (2) Solve any four questionsfrom remainingsix questions.(3) Assume suitable data wherever necessary.

[Total Marks: 100

~b~ (0

Q.l Attempt any five. 20 Marks

A) What are the characteristics of an ideal operational amplifier?

B) Explain in detail voltage to current converter,

C) What is roll of rate of first order filter?

D) Draw the characteristics of an ideal comparator. Explain about zero crossing detectors.. , t

E)Howcurrent boosting is achieved in a 723 IC?

F) List the applications of Phase Locked Loop.

G)What are the different linear ICPackages?

Q.2 A) Explain briefly, why negative feedback is desirable in amplifier applications? Listthe four negative. feedback configurations. 10 Marks

B) Define the Common Mode Rejection Ratio. For the non-inverting amplifier in the below diagram,

Rl =.1I<!landRf = 10K!l. Rt

\10

-Calculate:

i) The maximum output offset voltag~due toVios andlb.The amplifier is LM307 with Vios = lOmV, Ib = 300nA and Ios =SOnA.

ii) Calculatethe value of Rcomp needed to reduce the effect of lb.

iii)<;:alculatethe maxim~m output offset voltage ifRcomp as calculated in Q.2 B)ii, is connected.in the circuit. 10 Marks

Q.3A) Design a forth order Butterworth low pass filter having upper cut-off frequency 1KHz.

10 Marks

B) What is a Switched Capacitor? Give the circuit,of a switched capaCitor low pass filter and discus~

various types of switched capacitor? 10 Marks

. [TURN OVER

", ~ ,,- ,,'

"',"vun"V-I;)

Con. 5701-GT-6693-10. 2

Q.4 A) With neat diagram and'waveform, e);plain about 10 Marks

i)Triangular wave generator

ii) Mono shotmultivibrator

B) A Schmitt trigger is with the upper threshold level Vut=OV and hysteresis widthVh =O.2V.Convert a 1KHz sine wave of amplitude 4Vpp into a square wave. Calculate the time duration ofthe negative and positive portion of the output waveform. 10 Marks

, Q.SA) Listthe various techniques of analog to digitalconversion. 10 Marks

Also explain about i) R-2R Ladder digital to analog convertor

ii)The counter type analog to digital convertor

B)Explainin brief about fixed voltage series regulator. What is current limit protection?.--....

10 Marks

Q.6A) Explainin detail about WienBridge oscillator. 10 Marks

B) What is Phase Locked Loop? Explain about monolithic phase locked loop.' 10 Marks

Q.7) Write 'short note on any four of the following20 Marks

i) Integrator usingoperation<:11 amplifier

ii) Precision rectifier

Hi) RCphase shift oscillator

iv) KRCfilter

v)Summing amplifier --.....

'I

~ IAU b~'fL~~u' .3~rn-~177 2ndHalf.Exam-10.DD(A)Comp, E\o..fl t'1('i( I 1:-,-

Con. 6493.10. (REVISED COURSE)~v..b- £\(!,(2 Hours)

(1<-zN) ~. H ,2.£)\0

GT-3639

[Total Marks: 50

N.S. (1) Question No.1 is compulsory.(2) Attempt any four questions from question Nos. 2 to 7.

1. Solve any five :-(a) What is acid rain? Give two effects of acid rain.(b) Differentiate between Bioprospecting and Biopiracy.(c) Write note on Cyclone Mitigation.(d) Name the fundamental principles of the environment.(e) Distinguish between Nuclear Fission and Nuclear Fussion.(f) Explain the term Sustainable Development.

10

2. (a) Give an account of Women and Child Welfare in India.(b) Discuss the causes and effect of Global Warming.

55

3. (a) Discuss the effect of Water Pollution.(b) Discuss the role of information technology in environment and human health.

55

4. (a) Short note on public awareness about the environment.(b) Explain Soil Errosion. How it happened give its types.

55

5. (a) What is Noise? Describe briefly the effect of noise on human health.(b) Write an essay on Disaster Management.

55

6. (a) Give the effect of deforestation.(b) Describe the grassland and forest ecosystem.

55

7. (a) Give the fifteen principles of Environmental Education.(b) Explain the benefits of biological diversity.

55