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Transistor Audio Power Amplifiers

Study 39 Electrical Engineering MCQs with correct answers and explanations.

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11Electrical EngineeringMedium

The output transformer used in a power amplifier is a ________ transformer?

AStep-up

BNone of the above

C1:1 ratio

DStep-down

Correct answer

D. Step-down

Explanation

The correct answer is Step-down.

12Electrical EngineeringMedium

Class________ power amplifier has the highest collector efficiency?

BAB

Correct answer

A. C

Explanation

The correct answer is C.

13Electrical EngineeringMedium

If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least________?

A5 W

B75 W

C1 W

D33 W

Correct answer

C. 1 W

Explanation

The correct answer is 1 W.

14Electrical EngineeringMedium

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?

A20 W

B5 W

C15 W

D10 W

Correct answer

A. 20 W

Explanation

The correct answer is 20 W.

15Electrical EngineeringMedium

The pulsating d.c. applied to power amplifier causes________?

AExcessive forward voltage

BHum in the circuit

CBurning of transistor

DNone of the above

Correct answer

B. Hum in the circuit

Explanation

The correct answer is Hum in the circuit.

16Electrical EngineeringMedium

Power amplifiers handle ________ signals compare to voltage amplifiers?

ALarge

BSmall

CVery small

DNone of the above

Correct answer

A. Large

Explanation

The correct answer is Large.

17Electrical EngineeringMedium

Class C amplifiers are used as ________?

AAF amplifiers

BDetectors

CNone of the above

Damplifiers

Correct answer

D. amplifiers

Explanation

The correct answer is amplifiers.

18Electrical EngineeringMedium

If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is ________ operation?

AClass C

BClass B

CNone of the above

DClass A

Correct answer

A. Class C

Explanation

The correct answer is Class C.

19Electrical EngineeringMedium

In class A operation, the operating point is generally located________of the d.c. load line?

ANone of the above

BAt saturation point

CAt the middle

DAt cut off point

Correct answer

C. At the middle

Explanation

The correct answer is At the middle.

20Electrical EngineeringMedium

A power amplifier has comparatively ________ ß?

ANone of the above

BSmall

CVery large

DLarge

Correct answer

B. Small

Explanation

The correct answer is Small.

11Electrical EngineeringMedium

The output transformer used in a power amplifier is a ________ transformer?

AStep-up

BNone of the above

C1:1 ratio

DStep-down

Correct answer

D. Step-down

Explanation

The correct answer is Step-down.

12Electrical EngineeringMedium

Class________ power amplifier has the highest collector efficiency?

BAB

Correct answer

A. C

Explanation

The correct answer is C.

13Electrical EngineeringMedium

If the zero signal dissipation of a transistor is 1W, then power rating of the transistor should be at least________?

A5 W

B75 W

C1 W

D33 W

Correct answer

C. 1 W

Explanation

The correct answer is 1 W.

14Electrical EngineeringMedium

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?

A20 W

B5 W

C15 W

D10 W

Correct answer

A. 20 W

Explanation

The correct answer is 20 W.

15Electrical EngineeringMedium

The pulsating d.c. applied to power amplifier causes________?

AExcessive forward voltage

BHum in the circuit

CBurning of transistor

DNone of the above

Correct answer

B. Hum in the circuit

Explanation

The correct answer is Hum in the circuit.

16Electrical EngineeringMedium

Power amplifiers handle ________ signals compare to voltage amplifiers?

ALarge

BSmall

CVery small

DNone of the above

Correct answer

A. Large

Explanation

The correct answer is Large.

17Electrical EngineeringMedium

Class C amplifiers are used as ________?

AAF amplifiers

BDetectors

CNone of the above

Damplifiers

Correct answer

D. amplifiers

Explanation

The correct answer is amplifiers.

18Electrical EngineeringMedium

If a transistor is operated in such a way that output current flows for 60o of the input signal, then it is ________ operation?

AClass C

BClass B

CNone of the above

DClass A

Correct answer

A. Class C

Explanation

The correct answer is Class C.

19Electrical EngineeringMedium

In class A operation, the operating point is generally located________of the d.c. load line?

ANone of the above

BAt saturation point

CAt the middle

DAt cut off point

Correct answer

C. At the middle

Explanation

The correct answer is At the middle.

20Electrical EngineeringMedium

A power amplifier has comparatively ________ ß?

ANone of the above

BSmall

CVery large

DLarge

Correct answer

B. Small

Explanation

The correct answer is Small.