BJT Amplifiers and Oscillators MCQs

Question 1

An high fidelty audio amplifier has a pass-band as

Accepted Answer

20 Hz to 20 kHz

Answer

0 Hz to 5 IcHz

Answer

2 kHz to 30 kHz

Answer

40 Hz to 20 kHz

Question 2

In a push-pull amplifier the resons for cross-over distortion is that

Accepted Answer

the combined transfer characteristics of the two transistors is most nonlinear at zero base current

Answer

the input signals rise fast at its zero

Answer

current switching from one transistor to another

Answer

the transistors are overdriven at the cross-over points

Question 3

The high and low frequency response of an RC coupled circuit can be increased by

Accepted Answer

decreasing load resistance

Answer

decreasing coupling capacitor

Answer

increasing coupling capacitor

Answer

increasing load resistance

Question 4

An amplifier should have which of the following?

Accepted Answer

All of the above

Answer

Stable operation

Answer

Low noise

Answer

High fidelity

Question 5

The gain of an amplifier in general is

Accepted Answer

complex

Answer

imaginary

Answer

none of the above

Question 6

____ contributes to harmonics distortion in amplifiers.

Accepted Answer

Non-linearity in active device

Answer

Defective activedevice

Answer

Positive feedback

Answer

Presence of noise

Question 7

In case of audio amplifiers which of the following distortions is least objectionable?

Accepted Answer

Phase distortion

Answer

Harmonic distortion

Answer

Inter-modulation distortion

Answer

Frequency distortion

Question 8

Two 3 speakers in series will have a total impedance of

Accepted Answer

6

Answer

3 LI

Answer

9 f2

Answer

12 CI

Question 9

A delay equalizer is a ____pass filter

Accepted Answer

all

Answer

band

Answer

low

Answer

high