JEE Main 2022 · 26 Jun · Shift 2 · Physics Q49

PhysicsSingle correct+4 / -1Question 49 of 90

The positive feedback is required by an amplifier to act an oscillator. The feedback here means :

External input is necessary to sustain ac signal in output.

A portion of the output power is returned back to the input.

Feedback can be achieved by LR network.

The base-collector junction must be forward biased.

Answer and worked solution

Official answer: B

Feedback means returning part of the output to the input; in phase (positive) it sustains oscillation without external input.

(B)

Topics:Transistors

JEE Main 2022 · 26 Jun · Shift 2, Physics question 49