Discussion
The correct sequence of sub-systems of Klystron amplifiers as they appear in the direction of flow of electron beam is
Answer: C
The sequence is cathode, buncher cavity, catcher cavity, collector. In a klystron amplifier the electron gun at the cathode launches the beam. The beam first passes the buncher cavity, where the RF input velocity-modulates it, then drifts and forms bunches, which give up energy to the catcher cavity, and the spent beam ends at the collector.
The options that start with the buncher before the cathode, or place the collector before the catcher, reverse the direction of the beam.
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