BJT Amplifiers and Oscillators MCQs

Question 1

Conversion efficiency of an amplifier is

Accepted Answer

the same as plate circuit or collector circuit efficiency

Answer

90%

Answer

80%

Answer

10%

Question 2

Five point method for calculating harmonic distortion is used

Accepted Answer

for large signals

Answer

for small signals

Answer

when second order harmonic distortion is to be found out

Answer

none of these

Question 3

One of the following types of distortions may not be objectionable in audio amplifiers

Accepted Answer

phase distortion

Answer

ntermodulation distortion

Answer

frequency distortion

Answer

harmonic distortion

Question 4

In bipolar transistor amplifiers, input excitation may be

Accepted Answer

a current signal

Answer

a voltage signa

Answer

a current or voltage signal

Answer

none of these

Question 5

In FET amplifiers, input excitation is

Accepted Answer

a voltage signal

Answer

a current signal

Answer

either a current or voltage signal

Answer

none of these

Question 6

Harmonic distortion at higher power level is

Accepted Answer

higher

Answer

lower

Answer

is determined by 3?point method

Answer

none of these

Question 7

In high quality audio amplifiers, maximum acceptable total harmonic distortion is

Accepted Answer

0.70%

Answer

10%

Answer

90%

Answer

0.10%

Question 8

Total harmonic distortion (D) is given in terms of cmponent harmonic distortion as

Accepted Answer

none of these

Answer

D = V1)12 + D22 +

Answer

0= Di + D2 + D3

Answer

D = Di2 + D22 + D32

Question 9

A single stage amplifier is powered by a 6 V battery having a current drain of 20 mA. If the load voltage is 5 V at 12 mA, conversion efficiency is

Accepted Answer

50%

Answer

25%

Answer

100%