Discussion
TWT is sometimes preferred to the multicavity Klystron amplifier because the former
Answer: B
A TWT is sometimes preferred to a multicavity klystron because the former has a greater bandwidth.
A klystron works with resonant cavities, so it has a narrow bandwidth. The travelling wave tube uses a non-resonant slow-wave helix, and amplifies over a wide band, often an octave or more.
The multicavity klystron is generally the more efficient and the higher power tube, so (A) and (D) are wrong. Having more modes is not an advantage, which rules out (C).
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