6. The main purpose of using transformer coupling in a class-A amplifier is to make it more :
(a) distortion-free
(b) bulky
(c) costly
(d) efficient
7. Crossover distortion occurs in …………….. amplifiers.
(a) push-pull
(b) class-A
(c) class-B
(d) class AB
8. The maximum overall efficiency of a class-B push-pull amplifier cannot exceed ________ percent.
(a) 100
(b) 78.5
(c) 50
(d) 85
9. The main use of a class-C amplifier is :
(a) as an RF amplifier
(b) as stereo amplifier
(c) in communication sound equipment
(d) as distortion generator
10. An ideal amplifier has :
(a) noise figure of less than 1 dB
(b) noise factor of unity
(c) output S/N more than input S/N
(d) noise figure of more than 0 dB
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