'mBH«$mo Va§J ¶w{º$¶m± VWm g§Mma {ZH$m¶

(1)

MSCPH-09

June - Examination 2017

MSc (Final) Physics Examination Microwave Devices and Communication

Systems

‘mBH«$mo Va§J ¶w{º$¶m± VWm g§Mma {ZH$m¶

Paper - MSCPH-09

Time : 3 Hours ] [ Max. Marks :- 80

Note: The question paper is divided into three sections A, B and C.

Write answers as per the given instructions. Check your paper code and paper title before starting the paper. In case of any discrepancy English version will be final for all purposes.

{ZX}e : ¶h àíZ nÌ "A', "~' Am¡a "g' VrZ IÊS>m| ‘| {d^m{OV h¡& àË¶oH$

IÊS> Ho$ {ZX}emZwgma àíZm| Ho$ CÎma Xr{OE& àíZnÌ ewê$ H$aZo go nyd©

àíZnÌ H$moS> d àíZnÌ erf©H$ Om±M bo {H$gr ^r {dg§JVVm H$s pñW{V _| A§J«oOr ê$n hr A§{V_ _mZm Om`oJm&

Section - A 8

×

2 = 16 (Very Short Answer Questions) (Compulsory)

Note: Answer all questions. As per the nature of the question delimit your answer in one word, one sentence or maximum up to 30 words. Each question carries 2 marks.

637

MSCPH-09 / 300 / 4 (1) (P.T.O.)

(2)

637

MSCPH-09 / 300 / 4 (2) (Contd.)

IÊS> - "A' (A{V bKw CÎmar¶ àíZ)

{ZX}e : g^r àíZm| Ho$ CÎma Xr{OE& Amn AnZo CÎma H$mo àíZmZwgma EH$ eãX, EH$ dm³¶ ¶m A{YH$V‘ 30 eãXm| ‘| n[agr{‘V H$s{OE& àË¶oH$ àíZ 2 A§H$m| H$m h¡&

1) (i) What does mean TM mode and TE mode?

TM

{dYm d

^TM

{dYm H$m Š`m VmËn`© h¡?

(ii) Write the any two important properties of S matrix?

S

_o{Q´>Šg H$s H$moB© Xmo _w»` {deofVmE± ~VmAmo&

(iii) What is the full form of TRAPATT diode?

TRAPATT

S>m`moS> H$m nyU© ê$n Š`m h¡?

(iv) Draw the block diagram of Travelling wave Tube (TWT).

àJm_r Va§J Q²>`w~

^(TWT)

H$m ãbmH$ {MÌ ~ZmAmo&

(v) What is the frequency range of microwave band Ku?

Ku

_mBH«$moVa§J ~oÊS> H$s Amd¥{V namg Š`m h¡?

(vi) Draw the block diagram of Bistatic Radar System.

{ÛñW¡{VH$ aS>ma {ZH$m` H$m ãbmH$ {MÌ ~ZmAmo&

(vii) For directional coupler, coupled power in the forward direction is ten times the coupled power in backward direction. What is the value of directivity of dB?

{Xer` `w½_H$ Ho$ {bE AJ« {Xem _| `wp½_V epŠV H$m _mZd níM {Xem _| `wp½_V epŠV Ho$ _mZ H$m Xg JwZm h¡ Vmo {XemË_H$Vm

(directivity)

H$m _mZ

^dB

_| Š`m hmoJm?

(viii) What do you understand by demodulation of signals?

g§Ho$Vmo Ho$ {S>_mSw>boeZ go AmnH$m H$`m VmËn`© h¡?

(3)

MSCPH-09 / 300 / 4 (3) (P.T.O.) 637

Section - B 4

×

8 = 32 (Short Answer Questions)

Note: Answer any four questions. Each answer should not exceed 200 words. Each question carries 08 marks.

(IÊS> - ~) (bKw CÎma dmbo àíZ)

{ZX}e : {H$Ýht Mma àíZm| Ho$ CÎma Xr{OE& Amn AnZo CÎma H$mo A{YH$V‘

200 eãXm| ‘| n[agr{‘V H$s{OE& àË¶oH$ àíZ 08 A§H$m| H$m h¡&

2) Explain the working of parallel plane waveguide.

g_mÝVa Va§JnWH$ H$s H$m`©{d{Y H$mo g_PmAmo&

3) What does mean Magic TEE (hybrid TEE)?

_o{OH$

^TEE

(g§H$a

^TEE

) H$m Š`m VmËn`© h¡?

4) Describe the working of Rotary Phase Shifter.

5) Compare the frequency and amplitude modulation.

Amd¥{V Ed§ Am`m_ _moSw>boeZ H$s VwbZm H$amo&

6) What do you mean by Antenna Impedance?

7) Briefly explain the Lens Antenna.

g§jon _| boÝg EpÝQ>Zm H$mo g_PmAmo&

8) Explain the working of CW Radar.

CW

9) Describe the Hybrid ring.

g§H$a db` H$mo g_PmAmo&

(4)

637

MSCPH-09 / 300 / 4 (4)

Section - C 2

×

16 = 32 (Long Answer Questions)

Note: Answer any two questions. You have to delimit your each answer maximum up to 500 words. Each question carries 16 marks.

{ZX}e : {H$Ýht Xmo àíZm| Ho$ CÎma Xr{OE& Amn AnZo CÎma H$mo A{YH$V‘ 500 eãXm| ‘| n[agr{‘V H$s{OE& àË¶oH$ àíZ 16 A§H$m| H$m h¡&

10) Explain the construction and working of two cavity klystrol.

11) Describe the construction and working of Magnetron.

12) What are Antenna theorems? Explain them with proof.

EpÝQ>Zm à_o` Š`m h¡ BÝho§ {gÕ H$a g_PmAmo&

13) Explain the Rectangular waveguides with field equations.