Semiconductor Physics and Diodes MCQs

Question 1

Peak-inverse-voltage of a semiconductor diode is

Accepted Answer

the maximum voltage a diode can withstand in the reverse bias condition

Answer

the maximum voltage a diode can withstand in the forward bias condition

Answer

the voltage across the diode in reverse bias condition

Answer

the voltage across the diode in forward bias condition

Question 2

The static resistance of a diode is

Accepted Answer

its DC opposition to the current flow

Answer

its opposition to AC flow

Answer

resistance of the diode when forward biased

Answer

none of these

Question 3

A semiconductor transistor operates in the active region only when

Accepted Answer

the emitter junction is forward biased and collector junction is reverse biased

Answer

both emitterand collector junctions are forward biased

Answer

both emitter and collector junctions are reverse biased

Answer

the emitter junction is reverse biased and collector junction is forward biased

Question 4

The capacitance appearing across a reverse biased semiconductor junction

Accepted Answer

decreases with increase in the bias voltage

Answer

increases with increase in the bias voltage

Answer

is independent of bias voltage

Answer

none of these

Question 5

A zener diode is generally operated

Accepted Answer

in a reverse?biased mode

Answer

in a forward?biased mode

Answer

with a very large value of reverse bias

Answer

none of these

Question 6

One of the following diodes will produce the highest pulsed power output

Accepted Answer

RIMPATT

Answer

Varactor

Answer

Gunn

Answer

Schottky barrier

Question 7

Performance of one of the following diodes is not based upon its negative resistance characteristic

Accepted Answer

Backward

Answer

Gunn

Answer

IMPATT

Answer

Tunnel

Question 8

One of the following microwave diodes is suitable for very low power oscillator only. It is

Accepted Answer

Tunnel

Answer

Gunn

Answer

IMPATT

Answer

LSA

Question 9

One of the following is not used as a mixer or detector at microwave frequencies

Accepted Answer

PIN diode

Answer

Schottky barrier diode

Answer

Crystal diode

Answer

(b) Backward?diode