G.H.RAISONI COLLEGE OF ENGG. NAGPUR DEPARTMENT OF INFORMATION TECHNOLOGY SESSION - 2009-10 SUBJECT: SEMESTER: III SEM

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1

G.H.RAISONI COLLEGE OF ENGG. NAGPUR

DEPARTMENT OF INFORMATION TECHNOLOGY

S
ESSION
-

2009
-
10

SUBJECT:
ELECTRONIC DEVICES & CIRCUITS

SEMESTER:

III

SEM


1.

Explain the characteristics of tunnel diode and discuss in brief Tunneling effect?

2.

Find the expressio
n for ripple factor and hence find values
of it

for full
-
wave
rectifier and half
-
wave
rectifier?

3.

What is P
-
N junction
diode?




4.

Write short notes on
:

a)

voltage doubler

b)

voltage stabilizers

5.

Explain the varactor
diode?

6.

Compare zener breakdown and avalanche
breakdown?

7.

What is
an early effect in transistor?

8.

In the figure
-
1
find

IE, IB, IC,
and VCE?



Given VCC=30V, R1=10K
Ω
, R2=30K
Ω
, R3=20K
Ω
,
β
=100,
-
VEE=
-
30V,
Neglect VBE.

9.

Calculate three transistor current in the figure
-
2?

Given VCC=10V, R1=1K
Ω
, R2=100K
Ω
, R3=0.5K
Ω
,
β
=200
, Neglect

VBE.

























10.

Explain any two compensation technique in short
?

11.

What are the factors responsible for operating point instability? Obtain the
thermal stability equation for transistor?



2

12.

Explain differe
nt

current component in PNP transistor?

13.

Compare CC, CB,
and CE

configuration in BJT?

14.

The reverse
saturation current in NPN

transistor in CB configuration is 15.5

A

For an emitter current of 4mA, collector current is 2.47mA.Find the value of
current Gain(
α
) and base current (IB) ?

15.

Explain transistor in CE configuration Also draw the output characteristics of CE
configuration

16.

Explain Voltage divider method for
transistor biasing? Explain its circuit analysis
and stability
factor?

17.

Write short note on :

a)

Photo transistors

b)

Operating point in transistors

18.

Determine the Bias resistor RB for fixed bias and collector to base bias &
compare the stability
factor S for both of them
Given VCC=12V, RL=330
Ω
, IB=0.3mA,
β
=100,

VCE=6V.

19.

Explain pinch
-
off condition of JFET and its characteristics?

20.

For FET draw & explain

i)

Fixed bias configuration

ii)

Voltage divider biasing








21.

Differentiate Between BJT and FET?


22.

Explain

SCR and its

different
a
pplication?


23.

A Common source FET amplifier with unbypassed Rs has following parameters

VDD=20V, Rd=15K
Ω
, Rs=0.5K
Ω
, Rg=1M
Ω, rd=5KΩ, gm=5ms

Calculate (i
)input resistance(Ri) (ii)output resistance(Ro) (iii)Voltage gain(Av)

24.

Explain basic
construction and

operation of

FET
?

W
hy FET is called as voltage
controlled device?

25.

What do mean by
UJT? Explain?

26.

A colpitt’s

oscillator has a coil with inductance of 120
µH
,

C1=
300pF
, C2
=1200Pf.

Find frequency of oscillation & minimum gain required for amplifier to sustained
oscillations


27.

Draw the schem
atic diagram of amplifier with negative feedback .What type of
feedback is used in amplifier & oscillations ?

28.

A Crystal has L=0.33H,C=0.065Pf,Cm=1Pf,R=5.5Ω




Find

(i) the series & parallel resonant frequency





(ii)Q factor for series & para
llel frequency

29.

Write a short note on




(i)Crystal oscillator (ii) RC Phaseshift oscillator

30.

What are

the advantages of push
-
pull configuration over singe

ended amplifier?

31.

Shows that
in a push
-
pull circuit odd harmonics are present in the output?

32.

Explain class A amplifier with
transformer coupling.Also derive expression for its
frequency?

33.

Write short notes on:

a)

Power Amplifier and its application

b)

Distortion in amplifier