c.
magnetic field is along the length of the waveguide.
d.
magnetic field is perpendicular to the Z axis of the waveguide.
8.
What type of coupling method is most commonly used to couple energy into a waveguide?
a.
Iris
c.
Probe
b.
Loop
d.
Aperture
9.
How is the propagated energy in a waveguide affected if the energy encounters a sudden change in the
size of the waveguide?
a.
Reflections occur in the waveguide.
b.
Operation changes from a TE mode to a TM mode.
c.
All of the energy is dissipated in the form of heat.
d.
All of the energy traveling in the waveguide is blocked.
10.
Assume that a section of waveguide is manufactured with several tuning devices. The one tuning device
that can be adjusted to make the waveguide either capacitive or inductive is the
a.
movable plunger.
c.
tuning screw,
b.
reactive plate.
d.
reactive stub.
11.
It is sometimes necessary to change the polarization of the energy inside a waveguide. A device that is
commonly used for this alteration is a
a.
choke joint.
b.
tapered horn.
c.
directional coupler.
d.
twisted section of waveguide.
12.
Flexible sections of waveguide are seldom used in RF feed systems because they
a.
have poor insulation.
b.
change the polarity of the wave.
c.
absorb energy in their resistive surfaces.
d.
cause reflections that result in a loss of power.
13.
Care must be taken to protect the inside surface of a waveguide because any
344 L2
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