Bipolar Junction Transistor MCQs

Question 1

In a junction transistor, the collector cut off current I030 reduces considerably by doping the

Accepted Answer

collector with low level of impurity

Answer

emitter with high level of impurity

Answer

emitter with low level of impurity

Answer

collector with high level of impurity

Question 2

In a transistor amplifier, the reverse saturation current 'Co

Accepted Answer

doubles for every 10?C rise in temperature

Answer

doubles for every 1?C rise in temperature

Answer

increases linearly with the temperature

Answer

doubles for every 5?C rise in temperature

Question 3

In the case of a bipolar transistor, a is

Accepted Answer

negative and < 1

Answer

positive and > 1

Answer

positive and < 1

Answer

negative and > 1

Question 4

The E13J of a given transistor is forward-biased and its CBJ reverse-biased. If the base current is increased, then its

Accepted Answer

lc will increase

Answer

lc will decrease

Answer

VcE will increase

Answer

Vincrease

Question 5

The collector characteristics of a CE - connected transistor may be used to find its

Accepted Answer

output resistance

Answer

input resistance

Answer

base current

Answer

voltage gain

Question 6

Which of the following approximations is often used in electronic circuits?

Accepted Answer

lc IE

Answer

IB lc

Answer

1B 1E

Answer

IE IB + lc

Question 7

When a transistor is fully switched ON, it is said to be

Accepted Answer

saturated

Answer

shorted

Answer

open

Answer

cut-off

Question 8

If a change in base current does not change the collector current, the transistor amplifier is said to be

Accepted Answer

saturated

Answer

cut-off

Answer

critical

Answer

complemented

Question 9

When an NPN transistor is saturated, its VcE

Accepted Answer

is low and lc is high

Answer

is zero and Ic is zero

Answer

equals V Ic is zero

Answer

equals V lc is high