AY©MmbH$ ¶wp³V¶m±± AZwê$n VWm A§H$s¶ Bbo³Q´>mo{Z³gPaper - MSCPH-04

(1)

MSCPH-04

June - Examination 2017

MSc (Previous) Physics Examination Semiconductor Devices Analog and

Digital Electronics

AY©MmbH$ ¶wp³V¶m±± AZwê$n VWm A§H$s¶ Bbo³Q´>mo{Z³g

Paper - MSCPH-04

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 purpose.

{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& àíZàÌ 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 Type 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.

617

MSCPH-04 / 300 / 4 (1) (P.T.O.)

(2)

617

MSCPH-04 / 300 / 4 (2) (Contd.)

IÊS> - "A'

(A{V bKw CÎma dmbo àíZ) (A{Zdm`©)

{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) Band gap of material in light emitting diode is 2eV. What is the wavelength of emitted light corresponding to that band gap?

àH$me CËgOu S>m`moS> ^(LED) Ho$ nXmW© H$m D$Om© AÝVamb ^2eV h¡& Cg D$Om© AÝVamb Ho$ g§JV CËg{O©V àH$me H$s Va§JX¡Ü`© Š`m hmoJr?

(ii) For Half wave rectifier, peak value of output voltage is 6.28 volt? What is the DC value of output voltage.

AY© Va§J {XîH$mar Ho$ {bE {ZJ©V dmoëQ>Vm H$m {eIa _mZ 6.28 dmoëQ>

h¡ Vmo {ZJ©V dmoëQ>Vm H$m ^DC _mZ {H$VZm h¡?

(iii) What do you mean by CMRR?

CMRR go AmnH$m Š`m VmËn`© h¡?

(iv) What is the simplified form of Boolean expression A+AB.

~ybr`Z ì`§OH$ ^A+ABH$m gabrH¥$V ê$n Š`m h¡?

(v) Draw the block diagram of “Parallel in Serial Out Shift Register.”

{ZåZ H$m ãbmH$ {MÌ ~ZmAmo

""g_mÝVa {Zdoe loUr {ZJ©V {dñWmnZ a{OñQ>a.''

(vi) What do you mean D/A conversion?

D/A ê$nmÝVaU go AmnH$m Š`m VmËn`© h¡?

(vii) Draw the transfer characteristics of N-channel FET.

Q´>mÝg\$a A{^bmj{UH$, ^N MoZb ^FET Ho$ {bE ~ZmAmo&

(3)

MSCPH-04 / 300 / 4 (3) (P.T.O.) 617

(viii) A, B and C are binary inputs, then draw the truth table for Boolean expression (A + BC + AB)

`{X ^{A, B} VWm ^C ~mBZar {Zdoer h¡ Vmo ~w{b`Z ì`§OH$

(A + BC + AB) Ho$ gË` gmaUr ~ZmAmo&

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 CÎmar¶ 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 Zener Diode.

OrZa S>m`moS> H$s H$m`©{d{Y H$mo g_PmAmo&

3) Describe the construction and working of Bridge Rectifier.

goVw {XîQ>H$mar H$s ~ZmdQ> VWm H$m`©{d{Y H$m dU©Z H$amo&

4) Explain the frequency response of RC coupled amplifier.

RC `wp½_V àdY©H$ H$s Amd¥{Îm AZw{H«$`m H$mo g_PmAmo&

5) Describe the phase shift oscillator.

H$bm {dñWmnH$ Xmo{bÌ H$mo g_PmAmo&

6) Explain the differentiator circuit using op-Amp.

AdH$bH$ n[anW H$mo ^op-Amp H$s ghm`Vm go g_PmAmo&

7) What do you mean by Half adder? Explain it.

8) Explain the working of D-Flib Flop.

(4)

617

MSCPH-04 / 300 / 4 (4)

9) What do you understand by multiplexer? Explain the 4 to 1 channel multiplexer.

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, working and characteristics of UJT.

11) Describe the advantages of negative feedback Amplifier.

12) Explain the following circuits using operational Amplifer.

(a) Summing Amplifier (b) Integrator

(b) g_mH$bH$

13) Describe the D/A conversion using binary ladder networks.

D/A ê$nmÝVaU H$mo {ÛAmYmar gr‹T>r OmbH$ H$s ghm`Vm go g_PmAmo&