2-12.
A transmitting antenna at
2-18.
An antenna that radiates
ground level should be
energy more strongly in one
polarized in what manner to
direction than another is said
achieve best signal strength?
to have what type of radiation
pattern?
1.
Horizontally
2.
Vertically
1.
Isotropic
3.
Circularly
2.
Anisotropic
4.
Linearly
3.
Bysotropic
4.
Circumstropic
2-13.
What term describes the
distance a wave travels during
the
1.
2.
3.
4.
period of one cycle?
Wavelength
Frequency
Travel time
Radiation rate
IN ANSWERING QUESTIONS 2-14 AND 2-15,
REFER TO FIGURE 24 OF THE TEXT.
2-14.
The points of high current and
voltage are best described by
which of the following terms?
1.
Peaks
2.
Crescents
3.
Loops
4.
Highs
2-15.
The points of minimum voltage
and minimum current are
represented by which of the
following terms?
1.
Lows
2.
Valleys
3.
Descents
4.
Nodes
2-16.
An antenna at resonance will
transmit at maximum
efficiency;
an antenna that is
not at resonance will lose
power in which of the
following ways?
1.
Skin effect loss
2.
Heat loss
3.
Ground absorption
4.
Wave scattering
2-17.
An antenna that radiates
energy in all directions is
said to have what type of
radiation pattern?
1.
Isotropic
2.
Anisotropic
3.
Bysotropic
4.
Circumstropic
2-19.
When viewing a radiation
pattern graph, you can expect
the areas of maximum and
minimum radiation be
identified by which of the
following terms?
1.
High and low probes
2.
Maximum and minimum
points
3.
Major and minor lobes
4.
Positive and negative
lobes
2-20.
If an antenna is too short for
the wavelength being used,
what electrical compensation
must be introduced for the
antenna to achieve resonance?
1.
Lumped resistance
2.
Lumped capacitive
reactance
3.
Lumped inductive
reactance
4.
More power
2-21.
If an antenna is too long for
the wavelength being used,
what electrical compensation
must be introduced for the
antenna to achieve resonance?
1.
Lumped resistance
2.
Lumped capacitive
reactance
3.
Lumped inductive
reactance
4.
Less power
2-22.
A ground screen is a series of
conductors buried 1 or 2 feet
below the surface in a radial
pattern and is usually of what
length in comparison to the
wavelength being used?
1.
One-quarter
wavelength
2.
Onehalf wavelength
3.
Three-quarter
wavelength
4.
Full wavelength
7