BJT Amplifiers and Oscillators MCQs

Question 1

An electronic oscillator is

Accepted Answer

an amplifier with feedback

Answer

a converter of A.C. to D.C. energy

Answer

just like an alternator

Answer

nothing but an amplifier

Question 2

The fundamental requirement for oscillations in an amplifier is

Accepted Answer

positive feedback from output to intput

Answer

negative feedback from output to intput

Answer

ample power gain of the amplifier

Question 3

___ oscillator is the most stable oscillator.

Accepted Answer

Crystal controlled

Answer

Weinbridge

Answer

Colpitts

Answer

Hartley

Question 4

The tuned circuit for good stability should have

Accepted Answer

high Q

Answer

low C

Answer

low R

Answer

low L

Question 5

By varying which of the following the RF feedback oscillator are usually tuned?

Accepted Answer

L or C

Answer

Load impedance

Answer

Bias

Answer

Supply voltage

Question 6

_____ oscillator has the best frequency stability and accuracy.

Accepted Answer

Crystal controlled

Answer

Tickler feedback

Answer

Colpitts

Answer

Hartley

Question 7

Surface Acoustic wave oscillators are suitable for

Accepted Answer

I-C applications

Answer

low power oscillations

Answer

low frequency oscillations

Answer

non-sinusoidal wave forms

Question 8

Oscillators have ____ feedback

Accepted Answer

positive

Answer

negative

Answer

no

Answer

either positive or negative

Question 9

From generating 1 kHz frequency which of the following oscillators will be suitable?

Accepted Answer

Weinbridge oscillator

Answer

Hartley oscillator

Answer

Colpitts oscillator

Answer

Tuned collector oscillator