Bipolar Junction Transistor MCQs

Question 1

A collector is cut off when

Accepted Answer

lc is zerp, IE is zero so that VCE = VCC

Answer

IE is slightly greater than lc

Answer

IB is zero and lc is maximum

Answer

IC is midway between maximum and minimum values

Question 2

A transistor is in active region when

Accepted Answer

lc = 131B

Answer

IB 13Ic

Answer

lc = IE

Answer

lc = IB

Question 3

Point out the wrong statement. In a transistor circuit, VcE = 0 when the transistor is

Accepted Answer

operating in cut-off

Answer

shorted out

Answer

operating in saturation

Answer

disconnected from Vcc

Question 4

Mark the wrong statement? In a circuit, VcE = V the transistor is

Accepted Answer

operating in saturation

Answer

operating in cut-off

Answer

open-circuited

Answer

operating with all resistors in series with VcE shorted

Question 5

In amplifier circuits, biasing of transistor is necessary to

Accepted Answer

fix the value of current amplification

Answer

ensure that transistor is saturated

Answer

ensure that transistor is cut-off

Answer

establish suitable dc working conditions

Question 6

The emitter of a transistor is generally doped the heaviest because it

Accepted Answer

has a dissipate maximum power

Answer

has to supply the charge carriers

Answer

is the first region of the transistor

Answer

must possess low resistance

Question 7

For current working of an NPN bipolar junction transistor, the different electrodes should have the following polarities with respect to emitter.

Accepted Answer

collector +ve, base +ve

Answer

collector +ve, base ?ve

Answer

collector ?ve, base +ve

Answer

collector ?ve, base ?ye

Question 8

The following relationships between a and p are correct EXCEPT

Accepted Answer

a ? 1

Answer

a p =13

Answer

a =1 +1

Answer

? a =1 +13

Question 9

The value of total collector current in a CB circuit is

Accepted Answer

lc = alE la

Answer

=alE

Answer

Ic = "IE 'co

Answer

Ic = alE