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(A) transistor oscillator is a circuit that produces a continuous periodic waveform. $(i)$ An oscillator uses an amplifier with positive feedback to s

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All $(i), (ii)$ and $(iii)$ are correct

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(A) transistor oscillator is a circuit that produces a continuous periodic waveform. $(i)$ An oscillator uses an amplifier with positive feedback to sustain oscillations. This is correct. $(ii)$ An oscillator does not necessarily have reduced gain; in fact,the Barkhausen criterion requires the loop gain to be at least $1$ for sustained oscillations. This statement is incorrect. $(iii)$ An oscillator converts $dc$ energy from a power supply into $ac$ output energy at a specific frequency. This is correct. Therefore,statements $(i)$ and $(iii)$ are correct. However,looking at the provided options,if we assume the question implies the definition of an oscillator,$(i)$ and $(iii)$ are the defining characteristics. Since no option matches $(i)$ and $(iii)$,and $(ii)$ is definitely false,we must re-evaluate. Given the standard textbook context,$(i)$ and $(iii)$ are the correct statements. If the options are fixed,$(i)$ and $(iii)$ are the intended correct components.

$A$ transistor oscillator is $(i)$ an amplifier with positive feedback,$(ii)$ an amplifier with reduced gain,$(iii)$ the one in which $dc$ supply energy is converted into an output energy. Then

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