T0C: RF hazards, radiation exposure, RF heating hazards, proximity to antennas, recognized safe power levels, hand held safety, exposure to others
T0C01:
What type of radiation are VHF and UHF radio signals?
Non-ionizing radiation
Gamma radiation
Ionizing radiation
Alpha radiation
T0C02:
When can radio waves cause injury to the human body?
Only if the combination of signal strength and frequency cause excessive power to be absorbed
Only when the frequency is below 30 MHz
Only when the frequency is greater than 30 MHz
Only when transmitter power exceeds 50 watts
T0C03:
What is the maximum power level that an amateur radio station may use at frequencies above 30 MHz before an RF exposure evaluation is required?
50 watts PEP at the antenna
1500 watts PEP transmitter output
1 watt forward power
50 watts PEP reflected power
T0C04:
What factors affect the RF exposure of people near an amateur transmitter?
All of these answers are correct
Frequency and power level of the RF field
Distance from the antenna to a person
Radiation pattern of the antenna
T0C05:
Why must the frequency of an RF source be considered when evaluating RF radiation exposure?
The human body absorbs more RF energy at some frequencies than others
Lower frequency RF fields have more energy than higher frequency fields
Lower frequency RF fields do not penetrate the human body
Higher frequency RF fields are transient in nature and do not affect the human body
T0C06:
How can you determine that your station complies with FCC RF exposure regulations?
All of these choices are correct
By calculation based on FCC OET Bulletin 65
By calculation based on computer modeling
By measurement of field strength using calibrated equipment
T0C07:
What could happen if a person accidentally touched your antenna while you were transmitting?
They might receive a painful RF burn injury
Touching the antenna could cause television interference
They would be able to hear what you are saying
Nothing
T0C08:
What action might amateur operators take to prevent exposure to RF radiation in excess of FCC supplied limits?
All of these answers are correct
Alter antenna patterns
Relocate antennas
Change station parameters such as frequency or power
T0C09:
How can you make sure your station stays in compliance with RF safety regulations?
By re-evaluating the station whenever an item of equipment is changed
Compliance is not necessary
By making sure your antennas have a low SWR
By installing a low pass filter
T0C10:
Which of the following units of measurement is used to measure RF radiation exposure?
Milliwatts per square centimeter
Megohms per square meter
Microfarads per foot
Megahertz per second
T0C11:
Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?
It takes into account the amount of time the transmitter is operating
It takes into account the transmitter power supply rating
It takes into account the antenna feed line loss
It takes into account the thermal effects of the final amplifier
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