2.
The electron beam in a reflex klystron is best described as
a.
an amplitude-modulated beam.
b.
a frequency-modulated beam.
c.
a velocity-modulated beam.
d.
an unmodulated beam.
3.
The purpose of the repeller plate in the reflex klystron is to
a.
collect the electrons and return them to the cathode.
b.
accelerate the electrons that are moving toward it.
c.
reverse the direction of the electron stream.
d.
couple the output to the adjacent circuit.
4.
The mode of operation in a reflex klystron is determined by the
a.
number of electrons in the stream.
b.
frequency of the input signal.
c.
electron transit time.
d.
size of the cavity.
5.
Modes other than the most powerful modes are used in a reflex klystron oscillator to provide
a.
a broader tuning range.
b.
a narrower tuning Lange.
c.
electrical tuning of the tube.
d.
mechanical tuning of the tube.
6.
Mechanical tuning is sometimes used in reflex klystrons because
a.
electrical tuning would involve interference between the oscillator and the local oscillator.
b.
small frequency changes can be made conveniently while the set is in operation.
c.
the mechanical tuning range is broader than the electrical tuning range.
d.
the electrical tuning range would involve changes in operating mode.
344 L1
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