3-52.
For a waveguide to be
terminated with a resistive
load, that load must be matched
to which of the following
properties of the waveguide?
1.
The bandwidth
2.
The frequency
3.
The inductance
4.
The characteristic
impedance
3-53.
A resistive device with the
sole purpose of absorbing all
the energy in a waveguide
without causing reflections is
a/an
1.
iris
2.
horn
3.
antenna
4.
dummy load
3-54.
A resistive load most often
dissipates energy in which of
the following forms?
1.
Heat
2.
Light
3.
Magnetic
4.
Electrical
3-55.
Reflections will be caused by
an abrupt change in which of
the following waveguide’s
physical
characteristics?
1.
Size and shape only
2.
Size and dielectric
material only
3.
Dielectric material and
shape only
4.
Size,
shape,
and dielectric
material
3-56.
A waveguide bend that in the E
and H plane must be greater
than two wavelengths to prevent
1.
cracking
2.
reflections
3.
energy gaps
4.
electrolysis
3-57.
A flexible waveguide is used in
short sections because of the
power-loss disadvantages.
What
is the cause of this power
loss?
1.
Walls are not smooth
2.
E and H fields are not
perpendicular
3.
Cannot be terminated in its
characteristic
impedance
4.
Wall size cannot be kept
consistent
3-58.
The choke joint is used for
what purpose in a waveguide?
1.
To reduce standing waves
2.
To restrict the volume of
electron flow
3.
To prevent the field from
rotating
4.
To provide a joint that can
be disassembled during
maintenance
3-59.
A circular waveguide is
normally used in a rotating
joint because rotating a
rectangular waveguide would
cause which of the following
unwanted conditions?
1.
Oscillation
2.
Large power loss
3.
Decrease in bandwidth
4.
Field–pattern distortion
3-60.
In your waveguide inspection,
you should be alert for which
of the following problems?
1.
Corrosion
2.
Damaged surfaces
3.
Improperly sealed joints
4.
Each of the above
3–61.
What type of corrosion occurs
when dissimilar metals are in
contact with each other?
1.
Contact
2.
Metallic
3.
Electrical
4.
Electrolytic
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