7.
The purpose of the magnetic field in a klystron tube is to
a.
control the output of the electron gun.
b.
provide additional velocity for the electrons.
c.
cause the electrons to spiral into a closer beam.
d.
cause the electrons to strike the walls of the drift tube.
8.
The strength of the electric field in the klystron's drift tube is established by the potential on the
a.
focusing electrode.
c.
repeller.
b.
resonant cavities.
d.
cathode.
9.
The diameter of the klystron's drift tube affects the focusing of the electron beam. For satisfactory
coupling and focusing, the drift tube's diameter should be approximately
a.
one-half wavelength of the operating frequency at the first cavity, and tapered to one-quarter
wavelength at the final cavity.
b.
one-quarter wavelength of the operating frequency.
c.
one-half wavelength of the operating frequency.
d.
the same as the gap across the resonant cavity.
10.
The velocity of the electrons entering the first cavity of a klystron power amplifier is controlled by the
a.
intensity of the magnetic field which controls the electrons in the drift tube.
b.
potential between the cathode and the focusing anode.
c.
amplitude of the RF signal to be amplified.
d.
density of the beam current.
11.
One of the effects of cavity loading in a klystron power amplifier is an increase in
a.
overall bandwidth.
c.
efficiency.
b.
power output.
d.
gain.
12.
The magnetic field which controls the diameter of the electron beam in the drift tube of the power-
amplifier klystron is created by the
a.
repeller plate potential.
c.
collector coil.
b.
prefocusing coil.
d.
body coils.
344 L1
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