C:-Only i
D:-Only iv
Correct Answer:- Option-C

Question52:-Which of the following statement is/are true about Zener Diode used
as a voltage regulator ?
i. Breakdown voltage increases with increase in current.
ii. If load current changes output voltage remains constant.
iii. Minimum value of Zener current must be maintained in order to keep the diode
in
Breakdown region.
iv. The load voltage is zero when it is operating in the breakdown region.
A:-Only ii and iii
B:-Only i and ii
C:-All of the above
D:-Only i and iii
Correct Answer:- Option-A

Question53:-Which of the following statement is/are true about Public Address
system ?

i. Must reduce reverberations.

ii. Microphone is a transducer used to convert electrical signal to sound signal.
iii. It must increase the acoustic feedback.

A:-Only i
B:-All of the above
C:-Only iii
D:-Only i and iii
Correct Answer:- Option-A
Question54:-In the frequency response curve of a RC coupled amplifier
A:-Voltage gain drops in the mid frequency range
B:-Voltage gain is uniform in the lower frequency range
C:-Voltage gain drops in the higher frequency range
D:-Voltage gain is uniform in the higher frequency range
Correct Answer:- Option-C
Question55:-In a common emitter amplifier
A:-The input resistance is very high
B:-The input signal is applied to the emitter terminal of the transistor
C:-Coupling capacitors are used to reduce distortions

D:-The output will have the same frequency as the input but with 180 degree
phase shift

Correct Answer:- Option-D

Question56:-Comparing AM transmission and FM transmission