Bipolar Junction Transistor MCQs

Question 1

Transistor works as a closed switch when emitter junction is biased and collector junction is biased.

Accepted Answer

forward, forward

Answer

forward, reverse

Answer

reverse, reverse

Answer

reverse, forward

Question 2

Transistor works as a variable rheostat when emitter junction is biased and collector junction is biased.

Accepted Answer

forward, reverse

Answer

reverse, reverse

Answer

reverse, forward

Answer

forward, forward

Question 3

With two diodes connected back to back with emitter diode forward biased and collector diode reverse biased.

Accepted Answer

emitter and base currents are nearly equal and collection current is very small

Answer

emitter and collector currents are nearly equal and base current is very small

Answer

base and collector currents are nearly equal and emitter current is large

Answer

none of the above

Question 4

Current base part of a transistor behaves like

Accepted Answer

constant current source

Answer

forward biased diode

Answer

a resistance

Answer

none of the above

Question 5

Majority carriers emitted by the emitter

Accepted Answer

mostly pass through the base region

Answer

mostly recombine in base region

Answer

are stopped by the collector junction barrier

Answer

recombine in the collector region

Question 6

The following relationships between a and 0 are correct except

Accepted Answer

oc = 1 ? 13

Answer

1 ? cc =1

Answer

a = 1 ++ 13a

Answer

ri =a

Question 7

A P-N-P transistor has

Accepted Answer

two P-regions and one N-region

Answer

only acceptor ions

Answer

only donor ions

Answer

three P-N junctions

Question 8

Regarding common emitter configuration which of the following statements is incorrect?

Accepted Answer

Its output resistance is very high

Answer

It is the only circuit which has voltage and current gains higher than unity

Answer

Its power gain is the best

Answer

none of the above

Question 9

The active region of the output characteristics for a common base transistor is that in which

Accepted Answer

emitter is forward-biased but collector is reverse-biased

Answer

both emitter and collector are forward-biased

Answer

collector is forward-biased and emitter is reverse-biased

Answer

both emitter and colector are reversed-biased