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The cavity resonators are used in the klystron amplifiers for

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The cavity resonators are used in the klystron amplifiers for

(a) Amplifying RF signals

(b) Amplifying microwave signals

(c) Attenuating RF signals

(d) Attenuating microwave signals

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

The question is from Waveguide Current and Excitation topic in section Waveguides of Electromagnetic Theory

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Right choice is (b) Amplifying microwave signals

The explanation: The cavity resonators are employed in the klystron amplifiers for amplifying the microwave signals.

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