BJT Amplifiers and Oscillators MCQs

Question 1

The noise factor for an ideal noise free transistor amplifier is

Accepted Answer

zero dB

Answer

1 dB

Answer

zero

Answer

none of the above

Question 2

A narrow band amplifier has a pass-band nearly ___ percent of the control frequency

Accepted Answer

10

Answer

5

Answer

25

Answer

50

Question 3

A negative feedback in amplifiers causes which of the following?

Accepted Answer

Harmonic distortion reduces

Answer

Bandwidth reduces

Answer

Noise increases

Answer

All of the above

Question 4

applies to the audio power output stage.

Accepted Answer

Complimentary symmetry

Answer

Low level signal

Answer

Class-C operation

Answer

Negligible distortion

Question 5

The bandwidth of a differential amplifier is comparable to that of a amplifier

Accepted Answer

cascade

Answer

signal stage CE

Answer

double stage CE

Answer

Darlington

Question 6

Treble tone of loudspeakers corresponds to which of the following?

Accepted Answer

High frequencies

Answer

Low amplitudes

Answer

High amplitudes

Answer

Low frequencies

Question 7

Which of the following coupling methods for a amplifier gives the highest gain?

Accepted Answer

Transformer coupling

Answer

Resistance coupling

Answer

Impedance coupling

Answer

Capacitance coupling

Question 8

A pulse transformer uses a core

Accepted Answer

ferrite

Answer

copper

Answer

iron

Answer

air

Question 9

In R-C coupled transformer _____ is mainly responsible for the fall of gain in low-frequency range

Accepted Answer

coupling capacitor

Answer

grid leak resistor

Answer

transistor

Answer

stray shunt capacitance