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RFC choke present in Collpitts oscillatory circuit is for _________

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RFC choke present in Collpitts oscillatory circuit is for _________

(a) High reactance to oscillation

(b) Low reactance to oscillation

(c) Variable reactance to oscillation

(d) Biasing to oscillation

This question was posed to me in an internship interview.

This interesting question is from Colpitts Oscillator-1 in portion Oscillators of Analog Circuits

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The correct answer is (a) High reactance to oscillation

For explanation: RFC choke present in Colpitts oscillator is to provide high reactance to AC oscillation and low reactance to DC supply to improve performance.

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