Transistor Audio Power Amplifiers Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “Transistor Audio Power Amplifiers ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Transistor Audio Power Amplifiers comprehensively.

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1.
The output transformer used in a power amplifier is a _____________ transformer?

1:1 ratio

Step-up

Step-down

None of the above

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2.
The pulsating d.c. applied to power amplifier causes________________?

Burning of transistor

Hum in the circuit

Excessive forward voltage

None of the above

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3.
If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion ?

Amplitude

Intermodulation

Frequency

None of the above

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4.
If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________________?

1V

100V

20V

10V

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5.
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 ?

20%

80%

40%

50%

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6.
The driver stage usually employs_________________?

Class A power amplifier

Push-pull amplifier

Class C amplifier

None of the above

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7.
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 ?

1 W

2 W

4 W

None of the above

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9.
What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?

2

7

3

None of the above

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10.
For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?

10 W

4 W

8 W

None of the above

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11.
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 ?

10 W

15 W

5 W

20 W

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12.
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

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13.
Power amplifiers generally use transformer coupling because transformer permits______________?

Cooling of the circuit

Impedance matching

Distortionless output

Good frequency response

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14.
The most important consideration in power amplifier is __________________?

Biasing the circuit

Collector efficiency

To keep the transformer cool

None of the above

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15.
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?

5 kO

20 kO

100 kO

10 kO

Answer Discus (0)

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