Discussion
Assertion (A) : An oscillator is basically multivibrator with feedback.
Reason (R) : R-C combination is used for low or high pass filtering.
Answer: D
The answer is (A) is false and (R) is true.
A sinusoidal oscillator is basically an amplifier with positive feedback, satisfying the Barkhausen criterion: loop gain of at least one and total phase shift of 0° or 360° at the oscillation frequency. A multivibrator is itself a relaxation oscillator that produces square waves; an oscillator is not a multivibrator with feedback added, so the Assertion is false.
The Reason is true: a series R with a shunt C forms a low-pass filter, and a series C with a shunt R a high-pass filter. Such R-C sections are used in RC phase-shift and Wien bridge oscillators, but that fact does not rescue the Assertion.
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