11. A power amplifier has comparatively __________________ ß ?
A. Small
B. Large
C. Very large
D. None of the above
✅ The correct answer is option A.
Transistor Audio Power Amplifiers MCQs
12. Power amplifiers generally use transformer coupling because transformer permits______________?
A. Cooling of the circuit
B. Impedance matching
C. Distortionless output
D. Good frequency response
✅ The correct answer is option B.
13. When a transistor is cut off _________________?
A. Maximum voltage appears across transistor
B. Maximum current flows
C. Maximum voltage appears across load
D. None of the above
✅ The correct answer is option A.
14. The output stage of a multistage amplifier usually employs _________________?
A. Push-pull amplifier
B. Preamplifier
C. Class A power amplifier
D. None of the above
✅ The correct answer is option A.
15. Class _____________ operation gives the maximum distortion?
A. A
B. B
C. C
D. AB
✅ The correct answer is option C.
16. A class A power amplifier is sometimes called______________amplifier?
A. Symmetrical
B. Single-ended
C. Reciprocating
D. Differential
✅ The correct answer is option B.
17. Transformer coupling can be used in______________amplifiers?
A. Either power or voltage
B. Only power
C. Only voltage
D. None of the above
✅ The correct answer is option A.
18. 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 ?
A. 10 W
B. 15 W
C. 5 W
D. 20 W
✅ The correct answer is option D.
19. Low efficiency of a power amplifier results in_________________?
A. Low forward bias
B. Less battery consumption
C. More battery consumption
D. None of the above
✅ The correct answer is option C.
20. 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 ?
A. 20 W
B. 40 W
C. 10 W
D. 80 W
✅ The correct answer is option A.