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MHT CET 2020 (16 Oct, Shift 2) · Junction Transistor

Junction Transistor question from MHT CET 2020 (16 Oct, Shift 2)

Q81MHT CET 2020 · 16 OCT · SHIFT 2Medium

Junction Transistor

$A$ transistor has a voltage gain $A$ . If the amount $\beta A$ of its output is applied to the input of the transistor, then the transistor becomes oscillator, when

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Answer: (b)

Barkhausen criterion: sustained oscillations need loop gain $\beta A = 1$ (positive feedback, zero net phase shift).
So the answer is (b) $\beta A = 1$ .

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