11) In a half-wave rectifier, if an a.c. supply is 60 Hz, then what is the a.c. ripple at output ?
a) 30 Hz
b) 60 Hz
c) 120 Hz
d) 15 Hz
12) An amplifier has two identical cascaded stages. Each stage has a bandwidth of 20 kHz. The overall bandwidth shall approximately be equal to
a) 10 kHz
b) 12.9 Khz
c) 20 kHz
d) 28.3 kHz
13) A class-B push-pull type amplifier with transformer coupled load uses two transistors rated 10W each. What is the maximum power output one can obtain at the load from this circuit ?
a) 40W
b) 50W
c) 60W
d) 70W
14) A relaxation oscillator is one which
a) has two stable states
b) oscillates continuously
c) relaxes indefinitely
d) produces non-sinusoidal output
15)In a single-stage RC coupled common emitter amplifier, the phase shift at the lower 3dB frequency is
a) zero
b) 1350
c) 1800
d) 2250
16) Which one of the following power amplifiers has the maximum efficiency ?
a) Class A
b) Class B
c) Class AB
d) Class C
17) A triangular-square wave generator uses
a) A sine wave oscillation and a comparator
b) An integrator and a comparator
c) A differentiator and a comparator
d) A sine wave oscillator and a clipper
18) Which one of the following is a wide-band amplifier ?
a) RF amplifier
b) IF amplifier
c) Video amplifier
d) AF amplifier
19) For a given op-amp, CMRR =105 and differential gain =105. What is the common mode gain of the op-amp ?
a) 1010
b) 2 x 105
c) 105
d) 1
Thank You!