E0 Questions
11 questions in this subelement. Click any question ID for more details.
Answer: B
When evaluating RF exposure levels from your station at a neighbor’s home, what must you do?
AEnsure signals from your station are less than the controlled maximum permissible exposure (MPE) limits
BEnsure signals from your station are less than the uncontrolled maximum permissible exposure (MPE) limits
CEnsure signals from your station are less than the controlled maximum permissible emission (MPE) limits
DEnsure signals from your station are less than the uncontrolled maximum permissible emission (MPE) limits
Answer: C
Over what range of frequencies are the FCC human body RF exposure limits most restrictive?
A300 kHz - 3 MHz
B3 - 30 MHz
C30 - 300 MHz
D300 - 3000 MHz
Answer: C
When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?
AEach transmitter that produces 20 percent or more of its MPE limit in areas where the total MPE limit is exceeded
BEach transmitter operating with a duty cycle greater than 25 percent
CEach transmitter that produces 5 percent or more of its MPE limit in areas where the total MPE limit is exceeded
DEach transmitter operating with a duty cycle greater than 50 percent
Answer: B
What hazard is created by operating at microwave frequencies?
AMicrowaves are ionizing radiation
BThe high gain antennas commonly used can result in high exposure levels
CMicrowaves are in the frequency range where wave velocity is higher
DThe extremely high frequency energy can damage the joints of antenna structures
Answer: D
Why are there separate electric (E) and magnetic (H) MPE limits at frequencies below 300 MHz?
AThe body reacts to electromagnetic radiation from both the E and H fields
BGround reflections and scattering cause the field strength to vary with location
CE field and H field radiation intensity peaks can occur at different locations
DAll these choices are correct
Answer: B
What is meant by “100% tie-off” regarding tower safety?
AAll loose ropes and guys secured to a fixed structure
BAt least one lanyard attached to the tower at all times
CAll tools secured to the climber’s harness
DAll circuit breakers feeding power to the tower must be tied closed with tape, cable, or ties
Answer: C
What does SAR measure?
ASignal attenuation ratio
BSignal amplification rating
CThe rate at which RF energy is absorbed by the body
DThe rate of RF energy reflected from stationary terrain
Answer: C
Which of the following types of equipment are exempt from RF exposure evaluations?
ATransceivers with less than 7 watts of RF output
BAntennas that radiate only in the near field
CHand-held transceivers sold before May 3, 2021
DDish antennas less than one meter in diameter
Answer: A
When must an RF exposure evaluation be performed on an amateur station operating on 80 meters?
AAn evaluation must always be performed
BWhen the ERP of the station is less than 10 watts
CWhen the station’s operating mode is CW
DWhen the output power from the transmitter is less than 100 watts
Answer: D
To what should lanyards be attached while climbing?
AAntenna mast
BGuy brackets
CTower rungs
DTower legs
Answer: A
Where should a shock-absorbing lanyard be attached to a tower when working above ground?
AAbove the climber’s head level
BTo the belt of the fall-arrest harness
CEven with the climber's waist
DTo the next lowest set of guys