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Q.

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

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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 is B.

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Detailed Solution

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When the amplifier connects with positive feedback, it acts as the oscillator the feedback here is positive feedback which means some amount of voltage is given to the input.

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