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BT/35/EC(EE)-301/T/ODD/13-14
ii) In VCO, the frequency is dependent on the value
of
2013-14
a)
Resistance
B. TECH–EE (3rd Sem)
b)
Inductance
Paper Name : Analog Electronic Circuits
Paper Code : EC(EE)-301
Full Marks : 70
Time : 3 Hours
The figures in the right-hand margin indicate marks.
Candidates are required to give their answers in
their own words as far as practicable.
Separate answer booklet to be used for
Part - A and Part - B
c)
Capacitance
d)
Voltage
iii) The ripple factor is lowest in
a)
Half-wave rectifier without filter
b)
Full-wave rectifier without filter
c)
Full-wave rectifier with capacitor fiber
d)
Full-wave rectifier with capacitor filter and
using a Zener diode.
PART - A
iv) For a square input of a differentiator, the output
(Marks : 35)
becomes
GROUP-A
(Multiple Choice Type Questions)
1.
Choose the correct alternatives from the following:
1×5=5
i)
Positive feedback amplifier is used to get
a)
Power amplifier
b)
Oscillator
c)
Current to voltage converter
d)
Voltage amplifier
v)
a)
trangular
b)
sin wave
c)
spike
d)
parabolic
The maximum theoretical efficiency of Class A
amplifier can be
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a)
90%
b)
60%
c)
25%
d)
50%
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GROUP-B
(Short Answer Type Questions)
Answer any three of the following.
2.
c)
transistor of CE, CC and CB modes.
5×3=15
Discuss the advantages of MOSFET over other
transistors. Mention some of its uses.
4+1
3.
Explain the difference between Class A and Class
B amplifiers. Discuss how a push-pull amplifier
can be used as power amplifier.
1+4
4.
Explain the stability factor and thermal run-away
of a transistor. With the help of circuit diagram
discuss the operation of CE mode transistor
amplifier.
2+3
5.
What is advantages of Op-Amp? Discuss different
uses of Op-Amps in practical circuits.
2+3
6.
8. a)
Explain
b)
the characteristics of a bipolar
What is load line? How it helps for different
classes of amplifier circuits?
c)
Draw the circuit of self biasing arrangement of
a npn transistor. How this arrangement improves
the stability factor against temperature variation.
Give some practical values against temperature
variation.
9. a)
4+4+7
Draw and explain the operation of a astable
multivibrator.
b)
With a neat diagram explain the operation of a
square wave generator and hence prove that the
frequency of the oscillator depends on the
circuit parameters.
c)
With the help of circuit diagram explain one
clipper circuit.
GROUP-C
(Long Answer Type Questions)
Answer any one of the following.
15×1=15
6+6+3
Explain h-parameter and why it is used in
amplifier of a transistor circuits.
b)
With the help of a basic amplifier circuit find
out the expressions of current gain, voltage gain
and input impedance using this parameter.
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4+8+3
transistor amplifier circuits.
Draw and explain the circuit diagram of an emitter
follower. Discuss its uses and how to improve the
gain.
3+2
7. a)
Discuss the typical h-parameter values for a
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PART - B
iv)
(Marks : 35)
GROUP : A
(Multiple Choice Type Questions)
10. Choose the correct alternatives from the following:
1×5=5
i)
Operational amplifiers may be used as
a) a power amplifier
b) a non-inverting voltage amplifier
c) voltage multiplier
d) logic gates
ii) A voltage to current converter circuit should
have
a) very high input impedance and low output
impedance
b) low input impedance and low ouput
impedance
c) low input impedance and high output
impedance
d) very high input impedance and very high
output impedance.
iii) Power amplifier produces maximum
harmonic distortion if it operates in
a) Class A mode
b) Class B mode
c) Class C mode
d) Class A-B mode.
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v)
To realize integration and differentiation of an
electrical signal we use
a) common emitter amplifier
b) emitter follower
c) operational amplifier
d) common base amplifier.
A rectangular pulse feed at the input of a circuit
produces ramp The circuit is
a) an integrator
b) differentiator
c) emitter follower
d) rectifier
GROUP : B
(Short Answer Type Questions)
Answer any three of the following.
11.
5×3=15
Explain how an operational amplifier be configured
as adder of two voltage signal.
12. With neat circuit diagram explain the functions of
a current to voltage converter.
13. With a suitable circuit diagram explain the
functions of a transformer coupled Class-A power
amplifier. Why this type of amplifiers are not
normally used for power amplification?
14. With proper illustration discuss the principle of
monostable, bistable and astable multivibrator.
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15. Explain the functioning of an inverting amplifier
using operational amplifier.
GROUP-C
(Long Answer Type Questions)
Answer any one of the following:
16. a)
15×1=15
Draw the circuit diagram of a transformer
coupled Class B amplifier.
b)
Explain the functioning of the amplifier.
c)
Derive the expression of power efficiency
of this amplifier.
17. a)
With a neat diagram discuss the functioning
of a differential amplifier.
b)
Derive the expression of CMRR.
18. With suitable circuit diagram, discuss the
realization of astable multivibrator using 555IC
Timer. How the frequency of oscillation may be
varied? Illustrate with suitable example.
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