( 3 Hours)

"2--;:1')2')0 (!)E ((2)e~"l1' -0..1-10-1,

Con. 5691-10. (REVISED COURSE)

N.S. : (1) Question No.1 is compulsory.(2) Attempt any four questions out of the remaining six questions.

1. Answer the following :-(a) Distinguish between Erlang Band Erlang C system.(b) Explain GSM services and features.(c) Explain data services in COMA2000.(d) Explain windowing in OF OMsignal and spectral efficiency.

20

2. (a) Explain with neat block diagram signal processing in GSM.(b) Explain the Bluetooth Network structure.

1010

3. (a) Explain with neat block diagram OFOM.(b) Why is power control important in COMA.

1010

4. (a) Explain pulse shaping in OFOM signal and spectral efficiency. 10(b) For a GSM system,explain physical channel formation hence give the GSM 10

radio airinterface.

5. (a) Explain the methods for capacity expansion in cellular communication.(b) Explainin detail COMA2000 layering structure.

1010

6. (a) Explain COMA 2000 Media Access Control Sublayer.(b) Explain logical channel of COMA IS 95.

128

7. Write short notes on any four :-(a) Trunking and GOS(b) Wireless Sensor Networks(c ) Rake Reciever(d) GPRS(e) Frame Structure of GSM.

20

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Coh.5693-10. """094

( 3 Hours) [Total Marks: 100

N.B. : (1) Question No.1 is compulsory.(2) Attemptany four questions out of the remaining six questions.

1. (a) What do you understand by the term Radar resolutions cell ?(b) What should be pulse repetition of Radar in order to achieve maximum

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unambigous range of 500 yards? .

(c) Ifthe radar has peak power of 800 kW,what is its average power and dutycycle?

(d) What are types of clutter?

20

2. (a) Derive the Radar range equation as governed by minimum detectable signal 10to noise ratio. Enumerate the system losses that might occur in long range.

(b) Draw functional block diagram of MTI Radar system and explain it. Also 10define the terms blindspeed.

3. (a) What do you mean by RCS? Explain the RCS of following :-(i) Sphere

(ii) Rod(iii) Complex Target.

(b) What do understand by RCS fluctuations? Explain different Swertings model 10for RCS fluctuations.

10

4. (a) Explain properties of sea and land clutter. 10(b) Derive an expression for doppler frequency shift in terms of transmitted frequency 10

and radial component of Target velocity vector.

5. (a) With a suitable diagram,explain working of Conical scan tracking Radar.(b) Explain the mechanism of range Tracking of moving target with example.

1010

6. (a) Explainthe workingof delay line canceler and derive an expression for the 10frequency response.

(b) Draw block diagram of CW radar and pulse doppler radar and explain equation 10echo signal.

7. Write short notes on :-

(a) LORAN(b) DECCA(c) TACAN.

20

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VToOct-IO-I06--Con. 6525-10. (REVISED COURSE) GT -8832

( 3 Hours ) [Total Marks: 100

N.B. : (1) Question No.1 is compulsory.(2) Attempt any four questions from remaining six questions. ."

c,\NF..F.Rl"GCOt.(3) Figures to the right indicate full marks. ~~~~ 'i'".,

(4) Assume suitable data, if any. /o..~~ 0 9 DEC 1ItG'. .

.~~Q I) Attempt the following.~:1\~

a) Discuss the different factors for selectionof battery for UPS. ~

b) State and explain briefly, the basic principle of operation of the dual converter.c) State the need orreduci.iun of harmonics in inverter oUtput.d) State briefly, the control strategies employed in chopper for operating the

switches.

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Q2) a) With the help of circuit diagram and relevant waveforms, explain the operationof single phase, hal f-wave converter drive for a separately excited DCmotor. (10)

b) Discuss the variable-frequency control method of an induction motor. (10)

Q3) a) Derivean expressionof output voltageof single phase fully controlledconverter with source inductance. (10)

b) Designa parallel inverterto feed a loadat 200 V, 50 Hz and peak loadcurrentis 2 A, Edc= 40 V. Specifythe ratingofSCRs, transformer and commutatingcomponents. (10)

Q4) a) Describe the operation of step up chopper and derive an expression for outputvoltage of it in terms of duty-cycle. (12)

b) Wilh the help ofa circuit diagram. explain the working ofSMPS. (08)

j,:, Q5) a) Explain sinusoidal pulse modulationas used in PWM inverter. (10).G''7 1.1 b) Drawand explain the torque-speed characteristicat different firing angles,

'/, for a full converter feedinga separatelyexcited DC motor. (10)

Q6) a) Discuss briefly,the stator voltagecontrol scheme of an induction motor. (10)b) Derive the e?,pressionfor commutatingcomponents L & C for a voltage

commutatedchopper. (10)

Q7) Write short note on :a) Regenerativebrakingb) Slipenergy recovery schemec) McMurrayinverter

(20)

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BE LP) £.I~xIN""I!i.'{3Hours) ~:~o ute!o.~1 : Marks : 100<;~ - ~H RUt, ~ ""IM\..'~"\\'Question no.! is compulsory -Attemptanyfour any fourquestionsfromrema~. .-- - . .-Assume suitable data whenever necessary

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N.B. : 1)

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Q.1 a) Differentiate between TCP and UDP.

b) Layers of the internet model correlate to the layers of the OSI model explain.

c) Explain the looping problem in bridge LAN. How to solve it.

d) Distinguish between packet switching & circuit switching

e) Explain the ISDN channel structure for basic & primary services.

Q.2. a) Draw the layered OSI network architecture. Explain the function of each layer

and show the path of actual and virtual connection between the layers.

b) Explain in detail Repeaters, Bridges, Routers and Switches.

Q.3.a) Explain XDSL technologies and its application. Explain in detail ADSL.

b) What is tbe exterior and interior routing? Explain in brief distance vector

routing and path vector routing.

Q.4.a) Draw block diagram of functional architecture ofISDN and explain ISDN channels. andinterface .

b) With respect to MAC protocol explain

i) Token Ring

ii) FDDI

Q.5.a) Writeshortnote on

i) IEEE 802.2

ii) IEEE802.3

b) Explain leaky bucket and Token bucket ~gorithm in details.

Q.6.a) what is protocol performance? Derive the relation for protocol performance for

i) Stop and wait flow control mechanism

ii) Sliding window protocol mechanism.

b) Explain different types of ARQ techniques and compare their merits and demerits

Q.7.Write short note on (Any Three)

i) Utilities. ii) SONET ISDN

iii) Berkeley API iv) Error control Techniques.

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N.S. : (1)

(2)(3)

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f '0/ ~'ft)l'm cr:J ~ttb -- VL 5 'L 'J-M'" ~Question NO.1 is compulsory. '. 1~._--

Attempt any four questions out of question nos. 2 to 7. t' l'Oe1/ tvDraw neat diagrams wherever required. ,,,,ov

1. (a) Compare Ion Implantation and Diffusion.(b) Explain constant field scaling in MOS Device.(c) Draw stick Diagram for CMOS Invertor.

(d) Implement function using CMOS f = ab+abc+a

20

2. (a) Explain Twin tub p~ocess in detail. 10(b) Calculate the threshold voltage VTo at VSB= 0, for a polysilicon gate N-channel 10

MOS transistor, with the following parameters :-Substrate doping density NA= 1016cm-3,Polysilicon gate dopping density No = 2 x 1020cm-3,Gate oxide thickness tox = 3000A andOxide interface fixed charge density Nox = 4 x 1010 cm-2.

3. (a)(b)

Draw circuit of 2 input NAND gate, stick Diagram and Layout.For a CMOS invertor find the region of operation :-

(i) Vin < Vth

(ii) Vin > CDD + Vtp

(iii) Vin = V1L

(iv) Vin = VIH

(v) Vin = switching threshold.

1010

4 (a) Compare resistive, Enhancement, Depletion load NMOS and CMOS invertor.(b) Consider a CMOS invertor with the following parameters :-

NMOS VTo,n = 0.6 V, ~lnCox = 60 ~lA/V2 and (W/L)n = 8

PMOS VTo,P = -0.7 V, ~P COX = 25 ~lA/V2 and (W/L)p = 12

Calculate the noise margins and the switching threshold (Vth) of this circuit. Thepower supply voltage is VDD = 3.3 V.

1010

5. (a) Write Verilog code of 1 Bit full adder using any style and instantiate it to design a 10"4 Bit full Adder.

{b) Explain the method to design 4: 1 MUX using pass transistor logic. Draw complete 10stick diagram.

6.' (a) Explain short channel effect in terms of:-(i) Velocity Saturation.

(ii) Mobility Degradation.(iii) Channel Length Modulation.(iv) Threshold Voltage.(v) Hot Electron Effect.

(b) An NMOS transistor with K = 20 ~tA/V2 and VTH = 1.5V is operated at VGS= 5Vand ID = 100 ~lA. Find VDs'

15

5

7. Attempt any three :-(a) Compare Burried and Butting contact.(b) Explain Latchup in CMOS and prevention.(c) Compare Semi custom and Full custom design.(d) Generate Verilog code for 4 Bit Shift Register.

20

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N.S, :

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( 1) Q t.

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I S~ VTIt~ues Ion 0, IS compu sory. 'j .

(2) Attempt any four questions out of the remaining six questions.

(3) Draw suitable diagrams and graphs wherever necessary. 2-\\1vh»(4) Figures to the right indicate full marks.

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1. (a) Explain ~he difference between Butterworth, Chebyshev and Elliptical filters. 10Mention their merits and demerits. Derive expression for the order of Butterworthfilter. .

(b) What is Frequency Warping? When do we use Bilinear transformation 10technique? What is an antialiasing filter? Why it is used?

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2. (a) Explain the working principle of a switched capacitor filter. What are the 10necessary conditions for the implementation of a switched capacitor filter.What type of switches are used and what are its advantages? Explain itsimplementation in a typical op-amp based integrator.

(b) Using bilinear transformation design a Digital Bandpass Chebyshev 10

filter with the following specification ap = 2 dB in the passband,(950 Hz) :s;f :s;(1150 Hz) as = 20 dB in the stopband, 0 :s;f :s;(550 Hz)and (2150 Hz) $, f ~ r..o sampling frequency f = 8 KHz.

3. (a) Write difference between IIR and FIR filter. Explain frequency sampling 10method using suitable example.

(b) Convert the following pole-zero IIR filter into a lattice-ladder structure:- 10y(n)'= -0,9 y(n-1) + 0.8 y(n-2) - 0,5 y(n-3)

+ x(n) + 2x(n-1) + 3x(n-2) + 2x(n-3)

4. (a) Explain a Linear phase FIR filter for the case of constant phase delay and 10group delay, using suitable equations. Draw Impulse response sequencesof symmetric sequences for (i) N odd and (ii) N even.

(b) A low pass 9igital filter has following specifications :-0.8:s; I H (ejW) I:s; 1 for 0 :s;w :s;0.2 71:

IH (ejW)I :s; 0.2 for 0.6 71::s; w :s;71:

Determine the order of Chebyshev and Butterworth filter to meet the followingspecification.

10

5. (a) What is an adaptive filter? What are its advantages? Which type of problem 10.can be solved using adaptive filter.

(b) Convert a second order Butterworth filter (Low Pass) to Digital filter using 10impulse invariant techniques.

6. (a) Design a Butterworth bandstop filter with 2 dB passband edges of 30 Hz 10and 100 Hz and 40 dB stopband edges of 50 Hz and 70 Hz.

(b) Explain Basic Weiner filter.OR

Explain the method of matched Z-transform.

10

7. (a) Explain Decimation and Interpolation. When it is required? Take suitable 10examples.

(b) Explain subband coding (Or) Quadrature mirror filtering. 10*********

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