Discussion
The Reflex Klystron can be used as
Answer: B
The reflex klystron is used as an oscillator only, option (B). It has a single cavity and a repeller, and the electrons that are turned back by the repeller feed energy back into the same cavity, which sustains oscillations at microwave frequency.
It is not used as an amplifier, because it has no separate input and output cavity, so options A and C are wrong. Option D says it is neither an amplifier nor an oscillator, which is false since oscillation is its use. It is a low-power source, suited to use as a local oscillator.
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