BJT Amplifiers and Oscillators MCQs

Question 1

Due to which of the following the crystal frequency is very stable?

Accepted Answer

High Q of crystal

Answer

Structure of crystal

Answer

Rigidity of crystal

Answer

Size of crystal

Question 2

___oscillator uses a tapped coil in the LC tuned circuit.

Accepted Answer

a Weinbridge

Answer

tube and RC network

Answer

a low Q inductor

Answer

a high Q inductor

Question 3

Parasitic oscillations can be suppressed by using which of the following?

Accepted Answer

Low value capacitor

Answer

Metal casing for oscillators

Answer

Earth connection for chassis

Answer

Separate tank circuit

Question 4

An oscillator circuit is mainly converter.

Accepted Answer

D.C. to A.C.

Answer

A.C. to A.C.

Answer

D.C. to D.C.

Answer

A.C. to D.C.

Question 5

Which of the following are the two main parts of a tank circuit?

Accepted Answer

L and C

Answer

R and L

Answer

R and C

Answer

None of the above

Question 6

An oscillator can stop oscillating under which of the following conditions?

Accepted Answer

Reduction in transistor gain

Answer

Elimination of triggered pulses

Answer

Increase in transistor gain

Answer

None of the above

Question 7

The frequency of oscillation in case of RC a phase-shift oscillator is given by

Accepted Answer

1/2n ri-C-

Answer

2/ic

Answer

2it .J

Answer

1/27c R

Question 8

Which of the following oscillators uses a capacitive voltage divider to provide feedback?

Accepted Answer

Colpitts

Answer

Armstrong

Answer

Hartley

Answer

Multivibrator

Question 9

For frequency stabilization of an oscillator which of the following steps will help?

Accepted Answer

Use of a tuned circuit

Answer

Controlling the gain

Answer

Use of automatic biasing

Answer

None of the above