100+ Power Amplifier Multiple Choice Questions with Answers

This article lists 100 Power Amplifier MCQs for Engineering Students. The Power Amplifier Questions & Answers below include solutions and links to the relevant topic. This is helpful for users who are preparing for their exams and interviews, or professionals who would like to brush up on the fundamentals of the Power Amplifier.

The intention of utilizing amplifiers in the circuits is to enhance the weak signal's strength with the power supply connected externally. A signal applied can be either voltage, current, or power. So, based on the type of signal applied at the input & the modification needed, amplifiers are categorized.

The various types of amplifiers are Voltage amplifiers, Current amplifiers, and Power amplifiers. Power amplifiers are used to deal with the large power signals in the circuit. The enhanced strength of power signals can be used in driving loads of devices like headphones, and speakers.

Unlike other amplifiers, the powerful ones are connected directly to the output to drive loads. It is the final and the last block in the chain of amplifiers. Applied input to the Power amplifier must be above the threshold limit.

For this purpose, pre-amplification is needed. It can be done by using Voltage or Current amplifiers as pre-amplifiers. Based on the variant of device connected at outcome these amplifiers are categorized as Audio, DC & RF power amplifiers.

Name

1). _______ enhances the strength of the Power signal?

Power Amplifiers

Voltage Amplifiers

Current Amplifiers

None

2). A Power transistor is used in amplifying ______?

Power

Current

Voltage

b & c

3). What are the various power transistors?

Induction Transistors (Static)

MOSFETs

BJTs

All Mentioned Above

4). What type of amplifiers deliver large powers to load?

Power Amplifiers

Voltage Amplifiers

Current Amplifiers

Ultrasonic Amplifiers

5). What is the main agenda of Power amplifiers?

Supply Large Powers

Handle Large Currents

a & b

To Amplify Currents

6). The size of the power transistor is _____?

Large

Small

Meagre

Thin

7). Heat sink in power transistor is placed at ______?

Collector

Collector-Base Junction

Base

Emitter

8). How does the emitter region of power transistors doped?

Lightly

Heavily

Moderate

Undoped

9). Input resistance of power transistor is _____.

High

Moderate

Low

Infinite

10). What is the condition to transfer maximum power?

Low Resistance

Maximum Current

Impedance Matching

Load Effect

11). Power Amplifier is _____________ in size?

Bulky

Small

Light

Compact

12). Which one is a Power Amplifier?

Audio Amplifiers

Integrated Amplifiers

Current Amplifiers

Voltage Amplifiers

13). AC power achieved by Power amplifiers is _____.

High

Moderate

Low

Very High

14). What type of coupling is used in Power Amplifiers?

Resistor Coupling

Capacitor Coupling

Transformer Coupling

RC Coupling

15). What is the consistency of the Base region in power amplifiers?

Thick

Slender

Thin

Runny

16). Cooling system is required for _________?

Integrated Amplifiers

Power amplifiers

Current Amplifiers

Voltage Amplifiers

17). Why is Transformer Coupling used in Power amplifiers?

Low Resistance

Maximum Current

Impedance Matching

Load Effect

18). Power amplifiers have __________ at output?

Harmonic distortion

Distortion Less

High Resistance

High Inductance

19). For Audio applications , power amplifiers are placed at ______?

Initial Stage

Final Stage

Middle Stage

a & b

20). What is the important factor that determines an amplifier's efficiency?

Applied Input

Operating Point

Q-Point

b & c

21). What are the various power amplifiers classified considering frequency?

Audio Power Amplifiers

Radio Power Amplifiers

a & b

Integrated Amplifiers

22). What are the factors that contribute to obtaining maximum power at the outcome?

Collector Efficiency

Power Dissipation

Distortion& Capacity

All Mentioned Above

23). What describes how an amplifier converts DC to AC power?

Collector Efficiency

Power Dissipation

Distortion& Capacity

All Mentioned Above

24). What will be the efficiency for the battery supply of 10 Wand the AC power at the output is 2W?

10%

20%

30%

40%

25). What increases the transistor's temperature?

Applied Input

Biasing

Heat

Active Devices

Power Amplifier MCQs for Interviews

26). What alters the q-point of the transistor?

Applied Input

Biasing

Heat

Active Devices

27). The capability to dissipate heat is referred to as ______?

Collector Efficiency

Power Dissipation

Distortion& Capacity

All Mentioned Above

28). What should be the distortion to obtain a better outcome?

Less

High

Increased

29). What should be the collector efficiency of power amplifiers?

High

Moderate

Low

Reduced

30). What does the classification of Power amplifiers determine?

Characteristics

Performance

a & b

Output

31). Power amplifiers classified based on ___________line of load?

Applied Input

Operating Point

Q-Point

b & c

32). What are the various types of power amplifiers?

Class A

Class B

Class AB

All Mentioned Above

33). For class A position, Q-point is at _______ of Load line.

Center

Cut-off region

Above Cut-off

Below Cut-off

34). For class B position of Q-point is at _______ of the Load line?

Center

Cut-off region

Above Cut-off

Below Cut-off

35). For class C position of Q-point is at _______ of the Load line?

Center

Cut-off region

Above Cut-off

Below Cut-off

36). For class AB position of Q-point is at _______ of the Load line?

Center

Cut-off region

Above Cut-off

Below Cut-off

37). Which class of power amplifier conducts for the full duration of the cycle?

Class A

Class B

Class AB

All Mentioned Above

38). What is the angle of conduction of class A amplifiers?

180

270

360

39). What is the efficiency of a class A power amplifier?

25 to 50 %

50 %

78 %

78 to 90%

40). Which class of power amplifier has the lowest efficiency?

Class A

Class B

Class AB

All Mentioned Above

41). The voltage at output obtained in class A Amplifiers is _____?

Distorted

Distortion Less

Inverted

b & c

42). The signal at output obtained for class B amplifiers is ______?

Full-cycle

Half-cycle

Reduced Half

Complete 360

43). What is the conduction angle of the transistor in the class B amplifier?

180

270

Complete 360

44). How the transistor in class B amplifier reacts to absent input of AC?

Transistor is OFF

Transistor is ON

Transistor Conducts

Transistor Operates

45). (VCC, 0) is the Q-point coordinate of _______ amplifier?

Class A

Class B

Class AB

All Mentioned Above

46). How the distortion is eliminated in Class B amplifiers?

Using a Transistor

Using Two Transistors

Multiple Transistors Used

Resistor used

47). Class B amplifier efficiency is _____?

50%

60.5%

78.5%

90%

48). What amplifiers have crossover Distortion?

Class A

Class B

Class AB

All Mentioned Above

49). Class AB amplifiers eliminate _________?

Crossover Distortion

Heat

Temperature

Resistance

50). Why class B is advantageous in comparison to class A?

High Efficiency

Zero Power Dissipated

Impedance Matching

All Mentioned Above

Power Amplifier MCQs for Quiz

51). What configuration is preferred in audio systems?

Class A

Class B

Class AB

All Mentioned Above

52). Efficiency of class AB Amplifier is ___than Class B?

Less

High

Increased

53). Class C conducts for ____ than half of the cycle?

Less

High

Increased

54). _____ are not preferred for AF?

Class A

Class B

Class AB

Class C

55). What is the efficiency of class C amplifiers?

50%

60.5%

78.5%

95%

56). Which amplifiers are utilized as Tuned circuits?

Class A

Class B

Class AB

Class C

57). What are the drawbacks of class C power amplifiers?

RF interference is more

Difficulty Obtaining Coupling Transformers

Reduced Dynamic Range

All Mentioned Above

58). Which amplifier is preferable for Radio Frequency applications?

Class A

Class B

Class AB

Class C

59). What are the modes of Class C power amplifiers?

Tuned

Un-tuned

a & b

Mixed

60). In RF applications _______ amplifiers are used?

Class A

Class B

Class AB

Class C

61). ________ is switching amplifier?

Class A

Class B

Class C

Class D

62). Low cost designing prefer _________ amplifiers?

Class A

Class B

Class AB

Class C

63). Which class of power amplifier has distortion maximum?

Class A

Class B

Class AB

Class C

64). What is the reason behind using Push –pull configuration in class B amplifiers?

RF interference is more

Difficulty obtaining Coupling Transformers

Reduced Dynamic Range

Improve Efficiency

65). What are the classifications based on the Push-pull amplifier?

Class A

Class B

Class AB

All Mentioned Above

66). What are the transistors present in the push-pull circuit?

PNP

NPN

UJT

a & b

67). ________ is preferably placed in RF Power Amplifier.

Linear Amplifier

Non-Linear Amplifier

Initial Amplifier

Final Stage Amplifier

68). Which power amplifier has the highest linearity?

Class A

Class B

Class AB

Class C

69). Which power amplifier doesn’t have cross-over distortion?

Class A

Class B

Class AB

Class C

70). Which of these amplifiers is highly efficient?

Class A

Class B

Class C

Class D

71). ______ amplifier produces linear and less distorted output.

Class A

Class B

Class AB

Class C

72). Which amplifier has the highest fidelity of sound?

Class A

Class B

Class C

Class D

73). Which power amplifier is preferred for higher gains?

Class A

Class B

Class C

Class D

74). What are the classes of linear amplifiers?

Class A

Class B

Class C

All Mentioned Above

75). Which class of amplifiers utilizes an active element as a Current-controlled source?

Class A

Class B

Class C

All Mentioned Above

Power Amplifier MCQs for Students

76). What is determined by applying biasing at the input?

Distortion

Operating Point

Q-Point

Class

77). How does the power amplifier become efficient?

Using a Transistor

Using Two Transistors

Multiple Transistors Used

Using a Transistor as Switch

78). Which switching amplifier is not often utilized in RF applications?

Class A

Class B

Class C

Class D

79). _________ used in driving another source with high power?

RF power amplifiers

AF Power Amplifiers

Integrated Amplifiers

a & b

80). RF amplifiers with LDMOS used in ________?

Semiconductors

Power Semiconductor Devices

Conductors

Insulators

81). ______ amplifier used in digital networks?

LDMOS-based RF amplifiers

AF Amplifiers

MOSFETs

FETs

82). The output produced by the RF amplifier is ___?

Linear

Non-Linear

Distorted

Distortion Less

83). Why there is a cross-over distortion in class B?

Center

Cut-off Region

Above Cut-off

Below Cut-off

84). How is the cross-over distortion avoided in class AB?

Center

Cut-off Region

Above Cut-off

Below Cut-off

85). Class A amplifier has the active device in __________ configuration.

Common Emitter

Common Base

Common Collector

Common Source

86). Power amplifier circuit possess ___?

Positive Feedback

Negative Feedback

No Feedback Required

a & b

87). Why is negative feedback used in power amplifiers?

Reduce Distortion

Reduce Noise

Increase Bandwidth

All Mentioned Above

88). What is the conduction angle of the Class C amplifier?

< 180

90 to 150

>180

a & b

89). Which amplifier is used as Collector Modulator?

Class A

Class B

Class C

All Mentioned Above

90). Conduction angle = 0 in ________amplifier?

Class A

Class B

Class C

Class D

91). What class of amplifier is utilized in communications?

Class A

Class B

Class C

All Mentioned Above

92). What class of amplifiers is preferable for Bass?

Class A

Class AB

Class H

b & c

93). Which amplifiers are referred to as Rail Trackers?

Class A

Class AB

Class H

b & c

94). What is referred to as ice amplifier?

Class A

Class AB

Class D

b & c

95). PWM amplification addressed as ________?

Class A Amplification

Class AB Amplification

Class C Amplification

Class D Amplification

96). What is the switching frequency of class d amplifiers?

250KHz to 1.5 MHz

150 KHz

1.2MHz

450 KHz

97). Which modulator is utilized in the class S amplifier?

Delta

Sigma

Delta-sigma

None

98). Which switching amplifier is used USD in amplification of low-frequency?

Class D

Class E

Class S

Class T

99). What are the applications of RF power amplifiers?

Driving Transmitters Antenna

Exciting Microwave Cavity Resonators

Driving Another Source of High Powers

All Mentioned Above

100). __________ are placed at the transmitter’s last stage.

RF Power amplifiers

Voltage Amplifiers

Current Amplifiers

AF Amplifiers

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