Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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T9A01 What is a beam antenna?
a. | An antenna built from aluminum
I-beams | c. | An antenna that concentrates signals in one
direction | b. | An omnidirectional antenna invented by Clarence
Beam | d. | An antenna that reverses the phase of received
signals |
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2.
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T9A02 Which of the following describes a type
of antenna loading?
a. | Inserting an Inductor in the radiating portion of the
antenna to make it electrically longer | c. | Installing a spring in the base of a mobile vertical antenna to make it more
flexible | b. | Inserting a resistor in the radiating portion of the
antenna to make it resonant | d. | Strengthening the radiating elements of a beam antenna
to better resist wind damage |
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3.
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T9A03 Which of the following describes a
simple dipole oriented parallel to the Earth's surface?
a. | A ground-wave antenna | c. | A rhombic antenna | b. | A horizontally
polarized antenna | d. | A vertically polarized
antenna |
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4.
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T9A04 What is a disadvantage of the
"rubber duck" antenna supplied with most handheld radio transceivers when compared to a
full-sized quarter-wave antenna?
a. | It does not transmit or receive as
effectively | c. | If the rubber end cap is lost, it will unravel very
easily | b. | It transmits only circularly polarized
signals | d. | All of these choices are correct |
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5.
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T9A05 How would you change a dipole antenna
to make it resonant on a higher frequency?
a. | Lengthen it | c. | Shorten it | b. | Insert coils in
series with radiating wires | d. | Add capacitive loading to the ends of the radiating
wires |
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6.
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T9A06 What type of antennas are the quad,
Yagi, and dish?
a. | Non-resonant antennas | c. | Directional antennas | b. | Log periodic
antennas | d. | Isotropic antennas |
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7.
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T9A07 What is a disadvantage of using a
handheld VHF transceiver, with its integral antenna, inside a vehicle?
a. | Signals might not propagate well due to the shielding
effect of the vehicle | c. | The SWR might decrease, decreasing the
signal strength | b. | It might cause the
transceiver to overheat | d. | All of these choices are
correct |
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8.
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T9A08 What is the approximate length, in
inches, of a quarter-wavelength vertical antenna for 146 MHz?
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9.
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T9A09 What is the approximate length, in
inches, of a half-wavelength 6 meter dipole antenna?
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10.
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T9A10 In which direction does a half-wave
dipole antenna radiate the strongest signal?
a. | Equally in all directions | c. | Broadside to the antenna | b. | Off the ends of
the antenna | d. | In the direction of the feed line |
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11.
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T9A11 What is the gain of an antenna?
a. | The additional power that is added to the transmitter
power | c. | The increase in signal strength in a specified direction
compared to a reference antenna | b. | The additional
power that is lost in the antenna when transmitting on a higher frequency | d. | The increase in
impedance on receive or transmit compared to a reference
antenna |
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12.
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T9A12 What is an advantage of using a
properly mounted 5/8 wavelength antenna for VHF or UHF mobile service?
a. | It has a lower radiation angle and more gain than a 1/4
wavelength antenna | c. | It eliminates distortion caused by
reflected signals | b. | It has very high
angle radiation for better communicating through a repeater | d. | It has 10 times
the power gain of a 1/4 wavelength design |
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