BJT Amplifiers and Oscillators MCQs

Question 1

The maximum efficiency of Class-B amplifiers is

Accepted Answer

78.5 percent

Answer

20 percent

Answer

40 percent

Answer

60 percent

Question 2

Which of the following methods cannot be used to increase the bandwidth for cascaded amplifier stages?

Accepted Answer

Wave traps in each stage

Answer

Stagger tuning

Answer

Double tuned transformers with tighter coupling

Answer

A shunt damping resistor across each tuned circuit

Question 3

Staggered tuned amplifier generally use

Accepted Answer

CB configuration

Answer

CE configuration

Answer

CC configuration

Answer

JFET

Question 4

____amplifier has output closer to the output of a half wave rectifier

Accepted Answer

Class-B

Answer

Class-A

Answer

Class-C

Answer

None of the above

Question 5

The bandwidth of an amplifier can be reduced by which of the following?

Accepted Answer

Dominant pole compensation

Answer

Lead compensation

Answer

Miller effect compensation

Answer

Pole zero compensation

Question 6

IGFET is a___device.

Accepted Answer

square law

Answer

half power

Answer

logarithmic

Answer

linear

Question 7

____amplifiers have the highest amount of distortion.

Accepted Answer

Class-C

Answer

Class-A

Answer

Class-B

Answer

Class-AB

Question 8

Parasitic oscillations in amplifiers are caused by

Accepted Answer

transistor inter-junction capacitance

Answer

poor interstate coupling

Answer

push-pull operation

Answer

negative feedback

Question 9

In multistage amplifiers, direct coupling is espacially suited for amplifying

Accepted Answer

changes in D.C. voltage

Answer

sinusoidal signals

Answer

high-level voltage

Answer

high frequency A.C. signals