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Microwaves are generated by __________ and the power level is adjusted with the ________

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Microwaves are generated by __________ and the power level is adjusted with the ________

(a) Triode, rectifier

(b) Pentode, attenuator

(c) Klystron tube, attenuator

(d) Diode, rectifier

This question was posed to me in class test.

I would like to ask this question from Basic ESR Spectrometer topic in division Electron Spin Resonance Spectrometers of Analytical Instrumentation

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Correct option is (c) Klystron tube, attenuator

To explain I would say: Microwaves are generated by klystron tube and the power level is adjusted with the attenuator. Klystron tube is a low power device.

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