BJT Amplifiers and Oscillators MCQs

Question 1

"A common-emitter amplifier has a negative current gain." It it true?

Accepted Answer

Yes

Answer

No

Answer

It may or may not be true

Answer

none of these

Question 2

Power gain of a common?emitter (CE) amplifier

Accepted Answer

is always positive

Answer

is always negative

Answer

may be positive or negative

Answer

none of these

Question 3

So far as biasing is concerned, the main advantage of common?emitter over common?base is

Accepted Answer

none of these

Answer

that biasing circuit is simpler

Answer

that biasing circuit has to produce lower biasing voltage

Answer

that no biasing is required in CE amplifier

Question 4

In a CE amplifier, variation in DC collector current with temperature depends upon

Accepted Answer

IC, lb and Ie

Answer

Co only

Answer

IB and lC

Answer

none of these

Question 5

As the temperature increases

Accepted Answer

Co increases too

Answer

'co decreases

Answer

'Co remains unaltered

Answer

none of these

Question 6

Indicate the wrong statement

Accepted Answer

13 of a transistor is directly proportional to temperature

Answer

13 of a transistor, being the gain in CE configuration, is indeendent of temperature

Answer

IB (base current) is directly proportional to temperature

Answer

13 ofa transistor is always much greater than its a

Question 7

Increase in collector current due to some reason or other may cause

Accepted Answer

clipping and distortion of applied Signal

Answer

excessive heat generation in load resistor

Answer

shift of operating point in upward direction

Answer

none of these

Question 8

According to general nomenclature, stability factor (S) is defined as

Accepted Answer

rate of change of collector current with 'Co with IB and 1C kept constant

Answer

rate of change of collector current with IB and IC

Answer

Both A and B

Answer

none of these

Question 9

Indicate the false statement

Accepted Answer

Highe r the stability factor, better the amplification

Answer

It is more feasible or appropriate to call stability factor as instability factor

Answer

Higher the stability factor, poorer the amplification

Answer

CB configuration has lowest value of (S)