11. In class–A amplifier, the output current flows for :
(a) a part of the cycle or the input signal
(b) the full cycle of the input signal
(c) half the cycle of the input signal
(d) 3/4th of the cycle of the input signal
12. When an amplifier is provided with current series feedback, its :
(a) input impedance increases and output impedance decreases
(b) input and output impedances both decrease
(c) input impedance decreases and output impedance increases
(d) input and output impedances both increase
13. A differential amplifier, amplifies :
(a) the mathematically differentiates the average of the voltages on the two input lines
(b) the differentiates the input waveform on one line when the other line is grounded
(c) the difference of voltages between the two input lines
(d) the differentiates the sum of the two input waveforms
14. The common collector amplifier is also known as :
(a) collector follower
(b) base follower
(c) emitter follower
(d) source follower
15. The upper cutoff frequency of an RC coupled amplifier mainly depends upon :
(a) coupling capacitor
(b) emitter bypass capacitor
(c) output capacitance of signal source
(d) inter-electrode capacitance and stray shunt capacitance
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