.

~11 No. . ~qTotal No. of Questions: 09] ~

Paper ID [EC202] .

Time: 03 Hours

In~truction to Candidates:

t) Section -A is Compulsory. .

2) Attempt any Four questions from Section - B.

3) Attempt any 1\vo questions from Section - C.

Section -A

~

[Total No. of Pages: 02

(Please fill this Paper ID in OMR Sheet)

. B.Tech. (Sem~- 4th)

ANALOG ELECTRONICS (EC - 202)

Maximum Marks: 60

<

~4r.

~(10 X 2 = 20)

What are the Physical origins of resistances in hybrid-pi model 9f CE.Transistor Amplifier at high frequencies? .

What is an Oscillator? How does it differ from an Alternator?

Which configuration of Bipolar Transistor is called as Emitter follower& why, for what purpose it is used?.What are the advantages of Complimentary SymmetryAmplifier? .

What is the advantage of Staggertuned Amplifier? ..-.What are the different types of configurations used in multistage amplifiercircuits? .

What is the use of Bleeder in Zener VoltageRegulator?

. What are the Barkhusain conditions of oscillations in electronic systems?What is their significance?

Define T model of a Bipolar Transistor.

Define Line & Load Regulation.

Section - B"

(4 x 5 = 20)

. Q2) Find (a) feedback ratio (b) feedback factor (c) voltage gain without feedback(d) voltage gain with feedback for a circuit given below. Assume transistorJ3 = 200 and neglect Vbe.

R-55 [2058J P.T.o.

Ql)

a)

b)

c)

d)

e)

t)

g)

h)

i)

j)

3' gl'f~ ~B ~~ ":.:t.S"K

~

. G,-

.t~ ~ ik

o'J()c,j;

"';:.

VA."" t

~ht

Q3) A CE connected amplifier has CCb=5pF, Cbe-12pF, hfe=l 00, hie=1.5kQ .Find

the input capacitance to the-circuit for a circui~ collector resistance of 12k Q.

Q4) Explain how device Capacitances plays dominant role in CE Amplifier in

high frequency region.

Q5) What are the different types' of -ve feedback? Explain each with block

diagram.

Q6) Draw and explain the working of push pull class-A Amplifier. What are its

advantages & disadvantages?

Section - C

(2 x 10 = 20)

Q7) In a Transistor Colpitt'soscillatorwe have L=lOOJ.! H, LRFC= 0.6mH,

C1= 0.001 J.!F,C2=10J.!F.Find (a) operating frequency (b}feedback fraction(c) minimum $ain to sustain oscillations & Emitter Resistance ifR~ = 2.5k Q.

. Q8) Draw and explain the working ofR-C phase shift oscillator and also derivean expression for its frequency of oscillations.

Q9) Writeanot~ on following:

(a) MillerEffect.

(b) Tr.ansistorseries Regulators.

000

A