Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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T9B01 Why is it important to have low SWR when
using coaxial cable feed line?
a. | To reduce television interference | c. | To prolong antenna life | b. | To reduce signal
loss | d. | All of these choices are correct |
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2.
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T9B02 What is the impedance of most coaxial cables
used in amateur radio installations?
a. | 8 ohms | c. | 600
ohms | b. | 50 ohms | d. | 12
ohms |
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3.
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T9B03 Why is
coaxial cable the most common feed line selected for amateur radio antenna
systems?
a. | It is easy to use and requires few special installation
considerations | c. | It can handle more power than any
other type of feed line | b. | It has less loss
than any other type of feed line | d. | It is less expensive than any other type of feed
line |
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4.
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T9B04 What is the major function of an
antenna tuner (antenna coupler)?
a. | It matches the antenna system impedance to the
transceiver's output impedance | c. | It
allows an antenna to be used on both transmit and receive | b. | It helps a receiver automatically tune in weak
stations | d. | It automatically selects the proper antenna for the frequency band
being used |
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5.
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T9B05 In general, what happens as the
frequency of a signal passing through coaxial cable is
increased?
a. | The characteristic impedance
decreases | c. | The characteristic impedance
increases | b. | The loss decreases | d. | The loss
increases |
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6.
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T9B06 Which of the following connectors is most
suitable for frequencies above 400 MHz?
a. | A UHF (PL-259/SO-239) connector | c. | An RS-213 connector | b. | A Type N
connector | d. | A DB-25 connector |
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7.
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T9B07 Which of the following is true of
PL-259 type coax connectors?
a. | They are preferred for microwave
operation | c. | They are commonly used at HF
frequencies | b. | They are
watertight | d. | They are a bayonet type connector |
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8.
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T9B08 Why should coax connectors exposed to
the weather be sealed against water intrusion?
a. | To prevent an increase in feed line
loss | c. | To keep the Jacket from becoming
loose | b. | To prevent interference to
telephones | d. | All of these choices are correct |
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9.
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T9B09 What can cause erratic changes in SWR
readings?
a. | The transmitter is being modulated | c. | The transmitter is being over-modulated | b. | A loose connection in an antenna or a feed line | d. | Interference from
other stations is distorting your signal |
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10.
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T9B10 What is the electrical difference between
RG-58 and RG-8 coaxial cable?
a. | There is no significant difference between the two
types | c. | RG-8 cable has less loss at a given
frequency | b. | RG-58 cable has two shields | d. | RG-58 cable can
handle higher power levels |
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11.
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T9B11 Which of the following types of feed line has
the lowest loss at VHF and UHF?
a. | 50-ohm flexible coax | c. | Air-Insulated hard line | b. | Multi-conductor
unbalanced cable | d. | 75-ohm flexible
coax |
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