Electronics Engineering Objective Questions { BJT Amplifiers and Oscillators }

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8. A CE amplifier is characterised by

A. low voltage gain

B. moderate power gain

C. signal phase reversal

D. very high outupt impedance

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9. In a CC amplifier, voltage gain

A. cannot qceed unity

B. depends on output impedance

C. is dependent on input signal

D. is always constant

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10. A transistor amplifier with 85% efficiency is likely to be class ?

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11. A class ?A amplifier is that in which

A. base is biased to cut-off

B. lc flows most of the time

C. IE flows all the time

D. Vc often rises to Vcc

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12. Class-A amplifier is used when

A. no phase inversion is required

B. highest voltage gain is required

C. dc voltages are to be amplified

D. minimum distortion is desired

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13. In a class-A amplifier, conduction extends over 360? because Q-point is

A. located on load line

B. located near saturation point centred on load line

C. located at or near cut-off point

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14. In a class-A amplifier, worst-case condition occurs with

A. zero signal input

B. maximum signal input

C. high load resistance

D. transformer coupling

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