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Electrical Engineering
Transistor Audio Power Amplifiers
Quiz 2
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Q.1
An AF amplifier is shielded to ___________
Keep the amplifier cool
Protect from rusting
Prevent induction due to stray magnetic fields
None of the above
Q.2
If a transistor is operated in such a way that output current flows for 60° of the input signal, then it is ___________ operation
Class A
Class B
Class C
None of the above
Q.3
The push-pull circuit must use ___________ operation
Class A
Class C
Class B
Class AB
Q.4
In class A operation, the operating point is generally located ___________ of the d.c. load line.
At cut off point
At the middle
At saturation point
None of the above
Q.5
The output transformer used in a power amplifier is a ___________ transformer
1:1 ratio
Step-up
Step-down
None of the above
Q.6
For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
10 W
4 W
8 W
None of the above
Q.7
The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?
10 W
15 W
5 W
20 W
Q.8
The most costly coupling is ___________ coupling
RC
Direct
Impedance
Transformer
Q.9
When no signal is applied, the approximate collector efficiency of class A power amplifier is
10%
0%
25%
50%
Q.10
Transformer coupling can be used in ___________ amplifiers
Either power or voltage
Only power
Only voltage
None of the above
Q.11
A 2-transistor class B power amplifier is commonly called ___________ amplifier
Dual
Push-pull
Symmetrical
Differential
Q.12
A class A power amplifier is sometimes called ___________ amplifier
Symmetrical
Single-ended
Reciprocating
Differential
Q.13
If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least ___________
5 W
33 W
75 W
1 W
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