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Quiz 1
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Q.1
The horizontal intercept of dc load line is the same as ideal
Cut off point
Saturation point
Operating point
Quasi saturation point
Q.2
A 741-type OP-amp has a gain-bandwidth product of 1MHz.A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of
50 KHz
100 KHz
1000/17 KHz
1000/7.07 KHz
Q.3
A differential amplifier is invariably used in the i/p stage of all OP-amps.This is dome basically to provide the OP-amps with a very high
CMRR
Bandwidth
Slew rate
Open-loop gain
Q.4
The early effect in a bipolar junction transistor is caused by
Fast turn-on
Fast turn-off
Large collector-base reverse bias
Large emitter-base forward bias
Q.5
In a transistor leakage current mainly depends on
Doping of base
Size of emitter
Rating of transistor
Temperature
Q.6
The encapsulation of transistor is necessary for
Preventing radio interference
Preventing photo-emission effects
Avoiding loss of free electrons
Mechanical ruggedness
Q.7
Which of the following amplifier circuit using junction transistor has the best gain?
Common base
Common emitter
Common collector
All have the same gain
Q.8
When a transistor is connected in common emitter mode, it with have
Negligible input resistance and high output resistance
High input resistance and low output resistance
Medium input resistance and high output resistance
Low input resistance as well as output resistance
Q.9
Asource follower using an FET usually has a voltage gain which is
Greater than +100
Slightly less than unity but positive
Exactly unity but negative
About -10
Q.10
Three identical amplifiers with each one having a voltage gain of 50,input resistance of 1KΩ & output resistance of 250, are cascaded. The open circuit voltage gain of combined amplifier is
49dB
51dB
98dB
102dB
Q.11
A change in the value of the emitter resistance Re in a differential amplifier
Affects the difference mode gain Ad
Affects the common mode gain Ac
Affects both Ad and Ac
Does not effect either Ad and Ac
Q.12
The bandwidth of an RF tuned amplifier is dependent on
Q –factor of the tuned o/p circuit
Q –factor of the tuned i/p circuit
Quiescent operating point
Q-factor of the o/p and i/p circuits as well as quiescent operating point
Q.13
An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current shunt negative feedback amplifier using the above amplifier with a feedbacik factor of 0.2 is
1/11KΩ
1/5KΩ
5KΩ
11KΩ
Q.14
The most commonly used amplifier in sample & hold circuits is
A unity gain non-inverting amplifier
A unity gain inverting amplifier
An inverting amplifier with a gain of 10
An inverting amplifiers with a gain of 100
Q.15
In deriving ac equivalent circuit for an amplifier circuit we short circuit
All resistors
All transistors
All inductors
All capacitors
Q.16
Thermal runaway is not possible in FET because as the temperature of FET increases
The mobility decreases
The transconductance increases
The drain current increases
None of the above
Q.17
In all base driver amplifiers
ac collector voltage is 180° out of phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage
ac collector voltage is in phase with ac base voltage
none of the above
Q.18
The effective channel length of a MOSFET in a saturation decreases with increase in
Gate voltage
Drain voltage
Source voltage
Body voltage
Q.19
A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are
5 Ω & 20 %
25 Ω & 20 %
5 Ω & 16.7 %
25 Ω & 16.7 %
Q.20
In an OP-amp differentiator
The amplitude of output is proportional to rate of change of input
The amplitude of output is proportional to input
Output occurs when input is finite and constant
Polarity of input and output is the same
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