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Transistor Audio Power Amplifiers(Engineering > Electrical Engineering ) Questions and Answers
Home
Topic
Engineering
Electrical Engineering
Transistor Audio Power Amplifiers
Question 1.
The output stage of a multistage amplifier usually employs ___________
Push-pull amplifier
Preamplifier
Class A power amplifier
None of the above
Explanation:-
Answer: Option A. ->
Push-pull amplifier
Question 2.
___________ coupling is generally employed in power amplifiers
Transformer
RC
direct
Impedance
Explanation:-
Answer: Option A. ->
Transformer
Question 3.
The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor?
20 W
40 W
10 W
80 W
Explanation:-
Answer: Option A. ->
20 W
Question 4.
The disadvantage of impedance matching is that it ___________
Gives distorted output
Gives low power output
Requires a transformer
None of the above
Explanation:-
Answer: Option A. ->
Gives distorted output
Question 5.
The maximum efficiency of resistance loaded class A power amplifier is
5%
50%
30%
25%
Explanation:-
Answer: Option D. ->
25%
Question 6.
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
Explanation:-
Answer: Option B. ->
At the middle
Question 7.
Transformer coupling can be used in ___________ amplifiers
Either power or voltage
Only power
Only voltage
None of the above
Explanation:-
Answer: Option A. ->
Either power or voltage
Question 8.
The output transformer used in a power amplifier is a ___________ transformer
1:1 ratio
Step-up
Step-down
None of the above
Explanation:-
Answer: Option C. ->
Step-down
Question 9.
A 2-transistor class B power amplifier is commonly called ___________ amplifier
Dual
Push-pull
Symmetrical
Differential
Explanation:-
Answer: Option B. ->
Push-pull
Question 10.
A class A power amplifier is sometimes called ___________ amplifier
Symmetrical
Single-ended
Reciprocating
Differential
Explanation:-
Answer: Option B. ->
Single-ended
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