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ECE Objective Questions { BJT Amplifiers and Transistor }



85. CE amplifier is characterised by
A. low voltage gain
B. moderate power gain
C. signal phase reversal
D. very high output impedance

86. A CC amplifier has the highest
A. voltage gain
B. current gain
C. power gain
D. output impedance

87.  In a CC amplifier, voltage gain
A. cannot exceed unity
B. depends on output impedance
C. is dependent on input signal
D. is always constant

88.  In a class-A amplifier, conduction extends over 360? because Q-point is
A. located on load line
B. located near saturation point
C. centred on load line
D. located at or near cut-off point.

89. The circuit efficiency of a class-A amplifier can be increased by using
A. low dc power input
B. direct-coupled load
C. low-rating transistor
D. transformer-coupled load

90.  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

91.  The output of a class-B amplifier
A. is distortion-free
B. consists of positive half-cycle only
C. is like the output of a full-wave rectifier
D. comprises short-duration current pulses

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