Study desk with books and learning tools for subject-based MCQ preparation

Focused topic practice

transistor audio power amplifiers MCQs

Practise focused transistor audio power amplifiers questions with marked answers for exam preparation and subject revision.

transistor audio power amplifiers Mcqs
1. Class_____________ power amplifier has the highest collector efficiency ?
comments icon0

A. A

B. B

C. AB

D. C
2. The most costly coupling is _______________ coupling?
comments icon0

A. Impedance

B. Direct

C. RC

D. Transformer
3. Power amplifiers handle ______________ signals compare to voltage amplifiers?
comments icon0

A. Small

B. Very small

C. Large

D. None of the above

4. The output signal voltage and current of a power amplifier are 5V and 200 mA; the values being r.m.s. What is the power output ?
comments icon0
A. 1 W

B. None of the above

C. 2 W

D. 4 W

5. A power amplifier has comparatively __________________ ?
comments icon0
A. Small

B. Very large

C. None of the above

D. Large

6. What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?
comments icon0

A. None of the above

B. 2

C. 3

D. 7
7. When a transistor is cut off _________________?
comments icon0

A. None of the above

B. Maximum voltage appears across transistor

C. Maximum current flows

D. Maximum voltage appears across load

8. The size of a power transistor is made considerably large to________________?
comments icon0

A. Provide easy handling

B. None of the above

C. Dissipate heat

D. Facilitate connections

9. The driver stage usually employs_________________?
comments icon0
A. Class A power amplifier

B. Push-pull amplifier

C. None of the above

D. Class C amplifier

10. Transformer coupling can be used in______________amplifiers?
comments icon0

A. Only power

B. Only voltage

C. None of the above

D. Either power or voltage
11. Class C amplifiers are used as ___________________?
comments icon0

A. AF amplifiers

B. None of the above

C. amplifiers

D. Detectors

12. Low efficiency of a power amplifier results in_________________?
comments icon0

A. Less battery consumption

B. More battery consumption

C. Low forward bias

D. None of the above

13. A class A power amplifier uses _________________?
comments icon0

A. None of the above

B. Three transistors

C. Two transistors

D. One transistor
14. Power amplifiers generally use transformer coupling because transformer permits______________?
comments icon0

A. Distortionless output

B. Impedance matching

C. Cooling of the circuit

D. Good frequency response

15. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts ?
comments icon0

A. 80%

B. 40%

C. 50%

D. 20%

16. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?
comments icon0

A. None of the above

B. Intermodulation

C. Frequency

D. Amplitude

17. ________________ coupling is generally employed in power amplifiers?
comments icon0

A. Impedance

B. Transformer

C. RC

D. direct

18. A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
comments icon0

A. 20 kO

B. 100 kO

C. 10 kO

D. 5 kO

19. If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?
comments icon0

A. 100V

B. 10V

C. 1V

D. 20V

20. The output stage of a multistage amplifier is also called _________________-?
comments icon0

A. Mixer stage

B. Power stage

C. Detector stage

D. F stage