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1990-10-14
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FCC Novice Exam Question Pool. Subelement 2I.
Antennas and Feed Lines. 3 Questions.
One (1) question must be from the following:
------------------------------------------------
2I 1.1 A
What is the approximate length of a Half-Wave Dipole
antenna for 3725 kHz?
A. 126 ft.
B. 81 ft.
C. 63 ft.
D. 40 ft.
2I 1.2 D
What is the approximate length of a Half-Wave Dipole
antenna for 7125 kHz?
A. 84 ft.
B. 42 ft.
C. 33 ft.
D. 66 ft.
2I 1.3 C
What is the approximate length of a Half-Wave Dipole
antenna for 21,125 kHz?
A. 44 ft.
B. 28 ft.
C. 22 ft.
D. 14 ft.
2I 1.4 C
What is the approximate length of a Half-Wave Dipole
antenna for 28,150 kHz?
A. 22 ft.
B. 11 ft.
C. 17 ft.
D. 34 ft.
2I 1.5 D
How is the approximate length of a Half-Wave Dipole
antenna calculated?
A. By substituting the desired operating frequency
for f in the formula : 150/f (MHz.)
B. By substituting the desired operating frequency
for f in the formula : 234/f (MHz.)
C. By substituting the desired operating frequency
for f in the formula : 300/f (MHz.)
D. By substituting the desired operating frequency
for f in the formula : 468/f (MHz.)
2I 2.1 D
What is the approximate length of a Quarter-Wave Vertical
antenna adjusted to resonate at 3725 kHz.?
A. 20 ft.
B. 32 ft.
C. 40 ft.
D. 63 ft.
2I 2.2 D
What is the approximate length of a Quarter-Wave Vertical
antenna adjusted to resonate at 7125 kHz.?
A. 11 ft.
B. 16 ft.
C. 21 ft.
D. 33 ft.
2I 2.3 B
What is the approximate length of a Quarter-Wave Vertical
antenna adjusted to resonate at 21,125 kHz.?
A. 7 ft.
B. 11 ft.
C. 14 ft.
D. 22 ft.
2I 2.4 B
What is the approximate length of a Quarter-Wave Vertical
antenna adjusted to resonate at 28,150 kHz.?
A. 5 ft.
B. 8 ft.
C. 11 ft.
D. 16 ft.
2I 2.5 A
When a vertical antenna is lengthened,
what happens to its resonant frequency?
A. It decreases.
B. It increases.
C. It stays the same.
D. It doubles.
2I 2.6 C
What is the approximate length (in inches) of a
5/8 Wavelength Vertical antenna for the 220 MHz. band?
A. 19.5 Inches.
B. 22 Inches.
C. 28.5 Inches
D. 32 Inches.
2I 2.7 B
Why do many Amateurs use a 5/8 Wavelength Vertical
Antenna rather that a 1/4 Wavelength Antenna
for their VHF of UHF mobile stations?
A. A 5/8 Wavelength Antenna can handle more
power than a 1/4 Wavelength antenna.
B. A 5/8 Wavelength Antenna has more
gain than a 1/4 Wavelength antenna.
C. A 5/8 Wavelength Antenna exhibits less
corona loss than a 1/4 Wavelength antenna.
D. A 5/8 Wavelength Antenna looks more like
a CB Antenna, so it does not attract as
much attention as a 1/4 Wavelength Antenna.
One (1) question must be from the following:
------------------------------------------------
2I 3.1 D
What is COAXIAL CABLE?
A. Two parallel conductors encased along the
edges of a flat plastic ribbon.
B. Two parallel conductors held at a fixed distance
from each other by insulating rods.
C. Two conductors twisted around each other
in a double spiral.
D. A center conductor encased in insulating material
which is covered by a conducting sleeve or shield
and encased in a weatherproof jacket.
2I 3.2 B
What kind of antenna feed line is constructed of a center
conductor encased in insulation which is then covered
by an outer conducting shield and weatherproof jacket?
A. Twin Lead.
B. Coaxial Cable.
C. Open-Wire Feed Line.
D. Waveguide.
2I 3.3 B
What are some advantages in using Coaxial Cable
as an antenna feed line?
A. It is easy to make at home, and it has a characteristic
impedance in the range of most common amateur antennas.
B. It is weatherproof, and it has a characteristic
impedance in the range of most common amateur antennas.
C. It can be operated at a higher SWR than
twin lead, and is weatherproof.
D. It is unaffected by nearby metallic objects, and has a
characteristic impedance that is higher than twin lead.
2I 3.4 B
What commonly available antenna feed line can be buried
directly in the ground for some distance
without adverse effects?
A. Twin Lead.
B. Coaxial Cable.
C. Parallel Conductor.
D. Twisted Pair.
2I 3.5 C
When an antenna feed line must be located near grounded
metal objects, which commonly available feed line
should be used?
A. Twisted Pair.
B. Twin Lead.
C. Coaxial Cable.
D. Ladder Line.
2I 4.1 B
What is Parallel Conductor Feed Line?
A. Two conductors twisted around each other
in a double spiral.
B. Two parallel conductors held a uniform distance
apart by insulating material.
C. A conductor encased in insulating material which is then
covered by a conducting shield and a weatherproof jacket.
D. A metallic pipe whose diameter is equal to or slightly
greater than the wavelength of the signal being carried.
2I 4.2 C
How can TV TYPE TWIN LEAD be used as a feed line?
A. By carefully running the feed line parallel to a
metal post to insure self resonance.
B. TV Type Twin Lead can not be used
in an Amateur Radio Station.
C. By installing an impedance matching network between
the transmitter and the feed line.
D. By using a high power amplifier and installing a power
attenuator between the transmitter ad feed line.
2I 4.3 D
What are some advantages of using Parallel Conductor Feed Line?
A. It has a lower characteristic impedance than coaxial cable
and will operate at a higher SWR than coaxial cable.
B. It will operate at a higher SWR than coaxial cable
and it is unaffected by nearby metal objects.
C. It has a lower characteristic impedance than coaxial cable
and has less loss than coaxial cable.
D. It will operate at a higher SWR than coaxial cable
and has less loss than coaxial cable.
2I 4.4 A
What are some disadvantages in using parallel
conductor feed line?
A. It is affected by nearby metallic objects and it has a
characteristic impedance that is too high for direct
connection to most Amateur transmitters.
B. It is more dificult to make at home than Coaxial Cable
and it can not be operated at high SWR.
C. It is affected by nearby metallic objects and it can not
handle the power output of typical Amateur transmitters.
D. It has a characteristic impedance that is too high for
direct connection to most Amateur transmitters and
it will operate at high SWR.
2I 4.5 B
What kind of antenna feed line is constructed of two
parallel conductors maintained a uniform distance
apart by insulated spreaders?
A. Coaxial Cable.
B. Ladder Line open conductor line.
C. Twin Lead in a plastic ribbon.
D. Twisted Pair.
One (1) question must be from the following:
------------------------------------------------
2I 5.1 A
What type of pattern is produced by
a 5/8 Wavelength Vertical Antenna?
A. A pattern with the transmitted signal
spread out equally in all directions.
B. A pattern with more of the signal concentrated
in one direction than in other directions.
C. A pattern with most of the transmitted signal
concentrated in two opposite directions.
D. A pattern with most of the transmitted signal
concentrated at high radiation angles.
2I 6.1 B
What type of pattern is produced by a YAGI Antenna?
A. A pattern with the transmitted signal
spread out equally in all directions.
B. A pattern with more of the signal concentrated
in one direction than in other directions.
C. A pattern with most of the transmitted signal
concentrated in two opposite directions.
D. A pattern with most of the transmitted signal
concentrated at high radiation angles.
2I 6.2 D
On the Yagi Antenna show in Figure 2I-6,
what is the name of section B ?
A. Director.
B. Reflector.
C. Boom.
D. Driven Element.
2I 6.3 A
On the Yagi Antenna show in Figure 2I-6,
what is the name of section C ?
A. Director.
B. Reflector.
C. Boom.
D. Driven Element.
2I 6.4 B
On the Yagi Antenna show in Figure 2I-6,
what is the name of section A ?
A. Director.
B. Reflector.
C. Boom.
D. Driven Element.
2I 6.5 C
Approximately how long (in wavelengths)
is the driven element of a YAGI Antenna?
A. 1/4 Wavelength.
B 1/3 Wavelength.
C. 1/2 Wavelength.
D. 1 Wavelength.
------------------------------------------------
End of Subelement 2I.