BJT Amplifiers and Oscillators MCQs

Question 1

How many cascaded stages of CE amplifiers will result in polarity inversion of the input signal?

Accepted Answer

Three

Answer

Two

Answer

Any of the above

Answer

Polarity inversion is not possible in CE amplifiers

Question 2

With negative feedback, the bandwidth of an amplifier is

Accepted Answer

increased

Answer

decreased

Answer

either of the above

Answer

none of the above

Question 3

The negative feedback input impedance of an amplifier

Accepted Answer

increases

Answer

decreases

Answer

either of the above

Answer

none of the above

Question 4

A feedback circuit usually employs

Accepted Answer

resistive network

Answer

capacitive network

Answer

inductive network

Answer

none of the above

Question 5

If the feedback fraction in an amplifier is 0.01, then its gain with negative feedback is approximately

Accepted Answer

100

Answer

10

Answer

1000

Answer

10000

Question 6

In class-AB amplifiers, the current flows through the active device for

Accepted Answer

more than half but less than full cycle duration

Answer

less than half of the duraton of input cycle

Answer

half duration of input cycle

Answer

full duration of input cycle

Question 7

If three cascaded stages of amplifier have gains 10, 20 and 30, the overall gain will be

Accepted Answer

6000

Answer

200

Answer

400

Answer

1200

Question 8

Which of the following wil be preferred for high gain?

Accepted Answer

Cascade amplifier

Answer

Push-pull amplifier

Answer

Darlington amplifier

Answer

Any of the above

Question 9

In a RC coupled amplifier the component producing distortion is

Accepted Answer

transistor itself

Answer

resistor

Answer

capacitor

Answer

power supply