Discussion
On which of the following principles does Klystron operate ?
Answer: D
The klystron operates on velocity modulation.
In a klystron, the electron beam passes through the gap of an input (buncher) cavity, where the RF field speeds up some electrons and slows down others. Over the drift space the fast electrons catch up with the slow ones, so the beam forms bunches: velocity modulation is turned into current (density) modulation. The bunched beam then gives energy to the RF field in the output (catcher) cavity, producing amplification, or in a reflex klystron, oscillation.
Amplitude, frequency and pulse modulation are ways of impressing information on a carrier, not the mechanism by which a klystron works.
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