Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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T0C01 What type of radiation are VHF and UHF radio
signals?
a. | Gamma radiation | c. | Alpha
radiation | b. | Ionizing radiation | d. | Non-ionizing
radiation |
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2.
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T0C02 Which of the following frequencies has the
lowest value for Maximum Permissible Exposure limit?
a. | 3.5 MHz | c. | 440
MHz | b. | 50 MHz | d. | 1296
MHz |
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3.
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T0C03 What is the maximum power level that an
amateur radio station may use at VHF frequencies before an RF exposure evaluation is
required?
a. | 1500 watts PEP transmitter output | c. | 50 watts PEP at the antenna
| b. | 1 watt forward power | d. | 50 watts PEP
reflected power
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4.
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T0C04 What factors
affect the RF exposure of people near an amateur station antenna? a. | Frequency and power level of the RF
field | c. | Radiation pattern of the
antenna
| b. | Distance from the
antenna to a person | d. | All of these choices are
correct |
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5.
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T0C05 Why do
exposure limits vary with frequency? a. | Lower frequency RF fields have more energy than higher
frequency fields | c. | Higher frequency RF fields are
transient in nature | b. | Lower frequency RF
fields do not penetrate the human body | d. | The human body
absorbs more RF energy at some frequencies than at others |
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6.
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T0C06 Which of the
following is an acceptable method to determine that your station complies with FCC RF exposure
regulations? a. | By calculation based on FCC OET Bulletin
65 | c. | By measurement of field strength using calibrated
equipment | b. | By calculation based on computer
modeling | d. | All of these choices are correct |
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7.
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T0C07 What could
happen if a person accidentally touched your antenna while you were transmitting? a. | Touching the antenna could cause television
interference | c. | They might develop radiation
poisoning | b. | They might receive a painful RF
burn | d. | All of these choices are correct |
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8.
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T0C08 Which of the following actions might amateur
operators take to prevent exposure to RF radiation in excess of FCC-supplied limits?
a. | Relocate antennas | c. | Increase the duty cycle | b. | Relocate the
transmitter | d. | All of these choices are correct |
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9.
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T0C09 How can you make sure your station stays in
compliance with RF safety regulations?
a. | By informing the FCC of any changes made in your
station | c. | By making sure your antennas have low
SWR | b. | By re-evaluating the station whenever an item of
equipment is changed | d. | All of these choices are
correct
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10.
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T0C10 Why is duty
cycle one of the factors used to determine safe RF radiation exposure levels? a. | It affects the average exposure of people to
radiation | c. | It takes into account the antenna feed line
loss | b. | It affects the peak exposure of people to
radiation | d. | It takes into account the thermal effects of the final
amplifier |
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11.
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TOC11 What is the
definition of duty cycle during the averaging time for RF exposure? a. | The difference between the lowest power output and the
highest power output of a transmitter | c. | The
percentage of time that a transmitter is transmitting | b. | The difference between the PEP and average power output of a
transmitter | d. | The percentage of time that a transmitter is not
transmitting |
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12.
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T0C12 How does RF
radiation differ from ionizing radiation (radioactivity)? a. | RF radiation does not have sufficient energy to cause
genetic damage | c. | RF radiation is limited in range to a
few feet | b. | RF radiation can only be detected with an RF
dosimeter | d. | RF radiation is perfectly safe
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13.
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T0C13 If the averaging time for exposure is 6
minutes, how much power density is permitted if the signal is present for 3 minutes and absent for 3
minutes rather than being present for the entire 6 minutes?
a. | 3 times as much | c. | 2
times as much | b. | 1/2 as
much | d. | There is no adjustment allowed for shorter exposure
times |
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