The positive feedback is required by an amplifier to act an oscillator. The feedback here means: (a) External input is necessary to sustain ac signal in output. (b) A portion of the output power is returned back to the input. (c) Feedback can be achieved by LR network. (d) The base-collector junction must be forward biased.

Answer: (b). In feedback, part of the output is fed back to the input circuit; positive feedback means it is in phase with the input. This replaces losses so oscillations continue without any external input. So the answer is (b) A portion of the output power is returned back to the input.

The positive feedback is required by an amplifier to act an… | JEE Main 2022 (26 Jun, Shift 2)

Q53JEE Main 2022 · 26 JUN · SHIFT 2Easy

Junction Transistor

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

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Answer: (b)

In feedback, part of the output is fed back to the input circuit; positive feedback means it is in phase with the input.
This replaces losses so oscillations continue without any external input.
So the answer is (b) A portion of the output power is returned back to the input.

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