Question:

A Reflex Klystron oscillator uses

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Reflex klystron = single cavity oscillator.
Updated On: Jul 2, 2026
  • one cavity resonator
  • two cavity resonator
  • three cavity resonator
  • four cavity resonator
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The Correct Option is A

Solution and Explanation

Concept: Klystron tubes are microwave devices that use cavity resonators for oscillation.

Step 1: Types of klystrons There are two main types: (i) Two-cavity klystron (amplifier) (ii) Reflex klystron (oscillator)

Step 2: Reflex klystron structure It consists of only one cavity resonator.

Step 3: Working principle Electrons are emitted, pass through the cavity, and are reflected back by a repeller electrode.

Step 4: Oscillation mechanism The same cavity is used for both bunching and energy extraction.

Step 5: Conclusion \[ \boxed{\text{One cavity resonator}} \]

Final Answer: \[ \boxed{(A)} \]
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