BJT Amplifiers and Oscillators MCQs

Question 1

If two stages of a cascaded amplifier have decibel gains of 60 and 30, then overall gain is__dB.

Accepted Answer

90

Answer

1800

Answer

2

Answer

0.5

Question 2

Cascading two amplifiers will result in

Accepted Answer

increase in overall gain increase in overall bandwidth

Answer

reduction in overall gain and increase in overall bandwidth

Answer

reduction in overall gain and reduction in overall bandwidth

Answer

increase in overall gain and reduction in overall bandwith

Question 3

The overall bandwidth of two identical voltage amplifiers connected in cascade will

Accepted Answer

be better than that of a single stage

Answer

remain the same as that of a single stage

Answer

be worse than that of a single stage

Answer

be better if stage gain is low and worse if stage gain is high

Question 4

RC coupling is popular in low-level audio ampliifers because it

Accepted Answer

is inexpensive and needs no adjustments

Answer

has better low frequency response

Answer

provides an output signal in phase with the input signal

Answer

needs low voltage battery for collector supply.

Question 5

A transformercoupled amplifier would give

Accepted Answer

impedance matching

Answer

maximum voltage gain

Answer

maximum current gain

Answer

larger bandwidth

Question 6

The outstanding characteristic of a directcoupled amplifier is its

Accepted Answer

ability to amplify direct current and low-frequency signals

Answer

utmost economy

Answer

temperature stability

Answer

avoidance of frequency-sensitive components

Question 7

A signal may have frequency components which lie in the range of 0.001 Hz to 10 Hz. Which one of the following types of couplings should be chosen in a multistage amplifier designed to amplify this signal?

Accepted Answer

direct coupling

Answer

RC coupling

Answer

transformer coupling

Answer

double-tuned transformer

Question 8

Darlington pairs are frequently used in linear ICs because they

Accepted Answer

can be readily formed from two adjacent transistors

Answer

do not require any capacitors or inductors

Answer

have enormous impedance transformation capability

Answer

resemble emitter followers.

Question 9

When same input signal is applied to both the inputs of an ideal diff-amp, the output

Accepted Answer

is zero

Answer

depends on its CMMR

Answer

depends on its voltage gain

Answer

is determined by its symmetry