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Technician Class Exam Question Pool

effective 7/01/2014 thru 6/30/2018

    Unseen questions
    Weak questions
    Review questions
    Learned questions
    Incorrect answer choices  

T0C-2014: RF hazards: radiation exposure; proximity to antennas; recognized safe power levels; exposure to others; radiation types; duty cycle

T0C01-2014: What type of radiation are VHF and UHF radio signals?

Non-ionizing radiation

Gamma radiation

Ionizing radiation

Alpha radiation

T0C02-2014: Which of the following frequencies has the lowest value for Maximum Permissible Exposure limit?

50 MHz

3.5 MHz

440 MHz

1296 MHz

T0C03-2014: What is the maximum power level that an amateur radio station may use at VHF frequencies 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

T0C04-2014: What factors affect the RF exposure of people near an amateur station antenna?

All of these choices are correct

Frequency and power level of the RF field

Distance from the antenna to a person

Radiation pattern of the antenna

T0C05-2014: Why do exposure limits vary with frequency?

The human body absorbs more RF energy at some frequencies than at 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

T0C06-2014: Which of the following is an acceptable method to 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

T0C07-2014: What could happen if a person accidentally touched your antenna while you were transmitting?

They might receive a painful RF burn

Touching the antenna could cause television interference

They might develop radiation poisoning

All of these choices are correct

T0C08-2014: Which of the following actions might amateur operators take to prevent exposure to RF radiation in excess of FCC-supplied limits?

Relocate antennas

Relocate the transmitter

Increase the duty cycle

All of these choices are correct

T0C09-2014: 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

By informing the FCC of any changes made in your station

By making sure your antennas have low SWR

All of these choices are correct

T0C10-2014: Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?

It affects the average exposure of people to radiation

It affects the peak exposure of people to radiation

It takes into account the antenna feed line loss

It takes into account the thermal effects of the final amplifier

T0C11-2014: What is the definition of duty cycle during the averaging time for RF exposure?

The percentage of time that a transmitter is transmitting

The difference between the lowest power output and the highest power output of a transmitter

The difference between the PEP and average power output of a transmitter

The percentage of time that a transmitter is not transmitting

T0C12-2014: How does RF radiation differ from ionizing radiation (radioactivity)?

RF radiation does not have sufficient energy to cause genetic damage

RF radiation can only be detected with an RF dosimeter

RF radiation is limited in range to a few feet

RF radiation is perfectly safe

T0C13-2014: 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?

2 times as much

3 times as much

1/2 as much

There is no adjustment allowed for shorter exposure times

Color key:
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● = Incorrect answer
Previous group:
T0B-2014: Antenna safety: tower safety; erecting an antenna support; overhead power lines; installing an antenna
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