16.
The straps in a magnetron are designed to be one-half wavelength long
and will ensure that the magnetron operates properly. The rising sun
type magnetron does not require strapping because
a.
the magnetic field ensures that the RF energy in each slot is 180
degrees out of phase with the energy in the adjoining slot.
b.
it is not pulled off frequency by reflections in the waveguide.
c.
every other vane is larger than the one in between.
d.
it does not operate in the pi mode.
17.
The filament starting voltage for a QK324 magnetron is 4.8 volts and
the filament running voltage is zero. The reason for using zero volts
for the filament running voltage is that the
a.
magnetron's frequency is fixed.
b.
modulator pulse provides filament voltage.
c.
filament is heated by degenerative electrons.
d.
pulse width of the modulator pulse is very narrow.
18.
For proper operation in a magnetron, the electrons emitted by the
cathode must excite the cavities and also provide regeneration for the
cavities.
Regeneration is provided by electrons in the magnetron
shown in Figure 104, sketch labeled
a.
A.
b.
B.
c.
C.
d.
D.
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