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Electrical Engineering
Single Stage Transistor Amplifiers
Quiz 1
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Q.1
The point of intersection of d.c. and a.c. load lines is called ___________
Saturation point
Cut off point
Operating point
None of the above
Q.2
In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is ___________
180°
270°
90°
0°
Q.3
The purpose of capacitors in a transistor amplifier is to ___________
Protect the transistor
Cool the transistor
Couple or bypass a.c. component
Provide biasing
Q.4
The purpose of a coupling capacitor in a transistor amplifier is to ___________
Increase the output impedance of transistor
Protect the transistor
Pass a.c. and block d.c.
Provide biasing
Q.5
The radio wave picked up by the receiving antenna is amplified about times to have reasonable sound output
1000
A million
100
10000
Q.6
If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is
165
165 x 104
100
None of the above
Q.7
In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________
Short
Open
Partially short
None of the above
Q.8
CC configuration is used for impedance matching because its ___________
Input impedance is very high
Input impedance is low
Output impedance is very low
None of the above
Q.9
If a transistor amplifier draws 2mA when input voltage is 10 V, then its input impedance is ___________
20 kΩ
2 kΩ
10 kΩ
5 kΩ
Q.10
If the input capacitor of a transistor amplifier is short-circuited, then
Transistor will be destroyed
Biasing conditions will change
Signal will not reach the base
None of the above
Q.11
The phase difference between the output and input voltages of a CE amplifier is ___________
180°
0°
90°
270°
Q.12
The ratio of output impedance of a CE amplifier is ___________
About 1
Low
High
Moderate
Q.13
If the collector supply is 10V, then collector cut off voltage under d.c. conditions is ___________
20 V
5 V
2 V
10 V
Q.14
In order to get more voltage gain from a transistor amplifier, the transistor used should have ___________
Thin base
Thin collector
Wide emitter
None of the above
Q.15
In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________
Short
Open
Partially open
None of the above
Q.16
The purpose of d.c. conditions in a transistor is to ___________
Reverse bias the emitter
Forward bias the collector
Set up operating point
None of the above
Q.17
The output power of a transistor amplifier is more than the input power because the additional power is supplied by ___________
Transistor
Biasing circuit
Collector supply VCC
None of the above
Q.18
In transistor amplifiers, we generally use ___________ capacitors.
Electrolytic
Mica
Paper
Air
Q.19
The input capacitor in an amplifier is the ___________ capacitor
Coupling
Bypass
Leakage
None of the above
Q.20
The d.c. load of a transistor amplifier is generally ___________ that of a a.c. load
The same as
Less than
More than
None of the above
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