B:-39
C:-117
D:-42
Correct Answer:- Option-C
Question48:-Peak inverse voltage of a diode in centre tap full wave rectifier is
८-2४ (10
ന്ന്‌
6:۷2
D:-V_(m)2°
Correct Answer:- Option-A
Question49:-The various colours of LED can be obtained by varying the
A:-Material of the diode
B:-Cut in voltage of the diode
C:-Breakdown voltage of the diode
D:-Doping concentration of the diode
Correct Answer:- Option-A
Question50:-Determine the stability factor of a transistor with B = 100 with fixed bias is
A:-100
B:-78
C:-150
D:-101
Correct Answer:- Option-D
Question51:-The voltage buffer has
A:-Low input impedance and high output impedance
B:-High input impedance and low output impedance
C:-Low input impedance and low output impedance
D:-High input impedance and high output impedance
Correct Answer:- Option-B
Question52:-The gain of the RC coupled amplifier gets reduced at high frequencies due to
A:-Transistor
B:-Coupling capacitor
C:-Bypass capacitor
D:-Interelectrode capacitance
Correct Answer:- Option-D
Question53:-Give the output signal of a common emitter amplifier having a gain of 100 for an input signal 0.3 cos (200t)
A:-3 cos (200t)
B:-30 cos (200t + 90°)
C:-30 cos (200t + 180°)
D:-100 cos (200t + 90°)
Correct Answer:- Option-C
Question54:-Heat sinks are used in power amplifier circuits to
A:-Decrease output power
B:-Increase output power
C:-Increase collector dissipation rating of the transistor
D:-Reduce the heat losses in the transistor
Correct Answer:- Option-C
Question55:-The main advantage of crystal oscillator is
A:-High output voltage
B:-High frequency stability
C:-High efficiency
D:-High gain
Correct Answer:- Option-B
Question56:-Which of the given characteristics are false in case of ideal OPAMP ?
A:-Infinite output impedance
B:-Infinite input impedance
C:-Infinite CMRR
D:-Infinite bandwidth
Correct Answer:- Option-A
Question57:-Find the signal to noise ratio for diode current ‘|_(D)’ = 1‘mu*A over a 2 MHz bandwidth.