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ELE2I
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1992-01-26
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FCC NOVICE Exam Question Pool. Subelement 2I.
Antennas and Feedlines. 3 Questions.
---------------------------------------------------
2I 1.1 A
What is the approximate length (in feet) of a half-wavelength
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 (in feet) of a half-wavelength
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 (in feet) of a half-wavelength
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 (in feet) of a half-wavelength
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 (in feet) of a half-wavelength
dipole antenna calculated?
A. By substituting the desired operating frequency for f in
the formula: 150/f (in MHz)
B. By substituting the desired operating frequency for f in
the formula: 234/f (in MHz)
C. By substituting the desired operating frequency for f in
the formula: 300/f (in MHz)
D. By substituting the desired operating frequency for f in
the formula: 468/f (in MHz)
2I 2.1 D
What is the approximate length (in feet) of a quarter-wavelength
vertical antenna for 3725 kHz?
A. 20 ft
B. 32 ft
C. 40 ft
D. 63 ft
2I 2.2 D
What is the approximate length (in feet) of a quarter-wavelength
vertical antenna for 7125 kHz?
A. 11 ft
B. 16 ft
C. 21 ft
D. 33 ft
2I 2.3 B
What is the approximate length (in feet) of a quarter-wavelength
vertical antenna for 21,125 kHz?
A. 7ft
B. 11 ft
C. 14 ft
D. 22 ft
2I 2.4 B
What is the approximate length (in feet) of a quarter-wavelength
vertical antenna for 28,150 kHz?
A. 5 ft
B. 8 ft
C. 11 ft
D. 17 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 3.1 B
Why do many amateurs use a 5/8-wavelength vertical antenna
rather than a 1/4-wavelength vertical antenna for their VHF
or 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
2I 3.2 C
What type of radiation pattern is produced by a 5/8-wavelength
vertical antenna?
A. A pattern with most of the transmitted signal concentrated
in two opposite directions
B. A pattern with the transmitted signal going equally in all
compass directions, with most of the radiation going high
above the horizon
C. A pattern with the transmitted signal going equally in all
compass directions, with most of the radiation going close
to the horizon
D. A pattern with more of the transmitted signal concentrated
in one direction than in other directions
2I 4-1.1 D
What type of antenna produces a radiation pattern with more of
the transmitted signal concentrated in a particular direction
than in other directions?
A. A dipole antenna
B. A vertical antenna
C. An isotropic antenna
D. A beam antenna
2I 4-1.2 B
What type of radiation pattern is produced by a Yagi antenna?
A. A pattern with the transmitted signal spread out equally in
all compass directions
B. A pattern with more of the transmitted 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 4-1.3 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
2I 4-2.1 D
On the Yagi antenna shown in Figure 2I-4, what is the name of
section B?
A. Director
B. Reflector
C. Boom
D. Driven element
2I 4-2.2 A
On the Yagi antenna shown in Figure 2I-4, what is the name of
section C?
A. Director
B. Reflector
C. Boom
D. Driven element
2I 4-2.3 B
On the Yagi antenna shown in Figure 2I-4, what is the name of
section A?
A. Director
B. Reflector
C. Boom
D. Driven element
2I 4-2.4 A
What are the names of the elements in a 3-element
Yagi antenna?
A. Reflector, driven element and director
B. Boom, mast and reflector
C. Reflector, base and radiator
D. Driven element, trap and feed line
2I 5.1 A
How should the antenna on a hand-held transceiver be positioned
while you are transmitting?
A. Away from your head and away from others standing nearby
B. Pointed in the general direction of the repeater or other
station you are transmitting to
C. Pointed in a general direction 90 degrees away from the
repeater or other station you are transmitting to
D. With the top of the antenna angled down slightly to take
the most advantage of ground reflections
2I 5.2 B
Why should you always locate your antennas so that no one
can come in contact with them while you are transmitting?
A. Such contact can detune the antenna, causing television
interference
B. To prevent RF burns and excessive exposure to RF energy
C. The antenna is more likely to radiate harmonics when it
is touched
D. Such contact may reflect the transmitted signal back to
the transmitter, damaging the final amplifier
2I 5.3 C
You are going to purchase a new antenna for your VHF or UHF
hand-held radio. Which type of antenna is the best choice to
produce a radiation pattern that will be least hazardous to
your face and eyes?
A. A 1/8-wavelength whip
B. A 7/8-wavelength whip
C. A 1/2-wavelength whip
D. A short, helically wound, flexible antenna
2I 6.1 D
What is a 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
2I 6.2 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. Wave guide
2I 6.3 B
What are some advantages of 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 it
is weatherproof
D. It is unaffected by nearby metallic objects, and has a
characteristic impedance that is higher than twin lead
2I 6.4 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 6.5 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 7.1 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 7.2 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 ensure self resonance
B. TV-type twin lead cannot be used in an Amateur
Radio station
C. By installing an impedance-matching network between
the transmitter and feed line
D. By using a high-power amplifier and installing a power
attenuator between the transmitter and feed line
2I 7.3 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 higher SWR than coaxial cable and it has
less loss than coaxial cable
2I 7.4 A
What are some disadvantages of 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 difficult to make at home than coaxial cable and it
cannot be operated at a high SWR
C. It is affected by nearby metallic objects, and it cannot handle
the power output of a typical amateur transmitter
D. It has a characteristic impedance that is too high for direct
connection to most amateur transmitters, and it will operate at
a high SWR
2I 7.5 B
What kind of antenna feed line is constructed of two 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
2I 8.1 C
A certain antenna has a feed-point impedance of 35 ohms.
You want to use a 50-ohm-impedance coaxial cable to feed
this antenna. What type of device will you need to connect
between the antenna and the feed line?
A. A balun
B. An SWR bridge
C. An impedance-matching device
D. A low-pass filter
2I 8.2 C
A certain antenna system has an impedance of 1000 ohms
on one band. What must you use to connect this antenna
system to the 50-ohm output on your transmitter?
A. A balun
B. An SWR bridge
C. An impedance-matching device
D. A low-pass filter
2I 9.1 D
The word balun is a contraction for what phrase?
A. Balanced-antenna-lobe use network
B. Broadband-amplifier linearly unregulated
C. Balanced unmodulator
D. Balanced to unbalanced
2I 9.2 A
Where would you install a balun if you wanted to feed your
dipole antenna with 450-ohm parallel-conductor feed line?
A. At the transmitter end of the feed line
B. At the antenna feed point
C. In only one conductor of the feed line
D. From one conductor of the feed line to ground
2I 9.3 A
Where might you install a balun if you wanted to feed
your dipole antenna with 50-ohm coaxial cable?
A. You might install a balun at the antenna feedpoint
B. You might install a balun at the transmitter
output
C. You might install a balun 1/2 wavelength from the
transmitter
D. You might install baluns in the middle of each side
of the dipole
2I 10-1. C
A four-element Yagi antenna is mounted with its elements
parallel to the ground. A signal produced by this antenna
will have what type of polarization?
A. Broadside polarization
B. Circular polarization
C. Horizontal polarization
D. Vertical polarization
2I 11-1. D
A four-element Yagi antenna is mounted with its elements
perpendicular to the ground. A signal produced by this
antenna will have what type of polarization?
A. Broadside polarization
B. Circular polarization
C. Horizontal polarization
D. Vertical polarization
--------------------------------------------------
End of Subelement 2I.