Microwave Communication
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?

To slow down the signal on the helix
To accelerate the electron
To velocity modulate the electron beam
To keep the electrons from spreading out

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Microwave Communication
When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.

Which may be used to tune the radar receiver
To the tone of the pulse repetition
Which may be used to tune the radar synchronizer
Tune the magnetron to the correct frequency

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