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What does AFC stand for?

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What does AFC stand for?

(a) Auto frequency correct

(b) Automated frequency correct

(c) Automatic frequency control

(d) Automatic frequency circuit

The question was asked by my school principal while I was bunking the class.

I want to ask this question from Instrumentation of ESR Spectrometer in section Electron Spin Resonance Spectrometers of Analytical Instrumentation

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Correct choice is (c) Automatic frequency control

To explain: AFC stands for automatic frequency control. A 70 kHz AFC is used.

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