Power Amplifiers – 1 – 1

1. Just as a voltage amplifier amplifies signal voltage, a power amplifier :

(a) amplifies power 
(b) amplifies signal current 
(c) merely converts the dc power into useful ac power
(d) merely converts the signal ac power into the dc power 

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

2. ………………. coupling is generally employed in power amplifiers.

(a) RC
(b) direct
(c) Impedance
(d) Transformer

ANSWER
Answer : (d)

EXPLANATION
No answer description available for this question. Let us discuss.

3. Power amplifiers handle …………. signals compare to voltage amplifiers.

(a) Small
(b) Very small
(c) Large
(d) None of the above

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

4. A power amplifier has comparatively …………….. β.

(a) Small
(b) Large
(c) Very large
(d) None of the above

ANSWER
Answer : (a)

EXPLANATION
No answer description available for this question. Let us discuss.

5. Power amplifiers generally use transformer coupling because transformer permits:

(a) Cooling of the circuit
(b) Distortionless output
(c) Impedance matching
(d) Good frequency response

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

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