Amateur Extra exam E0: Safety

All 12 questions in subelement E0. The exam asks 1 of them, one from each group (E0A). Answers are hidden until you open them.

E0A

1. E0A01 What is the primary function of an external earth connection or ground rod?

   1. Prevent static build up on power lines
   2. Lightning charge dissipation
   3. Reduce RF current flow between pieces of equipment
   4. Protect breaker panel from power surges
   Show answer

   B. Lightning charge dissipation

2. E0A02 When evaluating RF exposure levels from your station at a neighbor’s home, what must you do?

   1. Ensure signals from your station are less than the controlled maximum permissible exposure (MPE) limits
   2. Ensure signals from your station are less than the uncontrolled maximum permissible exposure (MPE) limits
   3. Ensure signals from your station are less than the controlled maximum permissible emission (MPE) limits
   4. Ensure signals from your station are less than the uncontrolled maximum permissible emission (MPE) limits
   Show answer

   B. Ensure signals from your station are less than the uncontrolled maximum permissible exposure (MPE) limits

3. E0A03 Over what range of frequencies are the FCC human body RF exposure limits most restrictive?

   1. 300 kHz - 3 MHz
   2. 3 - 30 MHz
   3. 30 - 300 MHz
   4. 300 - 3000 MHz
   Show answer

   C. 30 - 300 MHz

4. E0A04 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?

   1. Each transmitter that produces 20 percent or more of its MPE limit in areas where the total MPE limit is exceeded
   2. Each transmitter operating with a duty cycle greater than 25 percent
   3. Each transmitter that produces 5 percent or more of its MPE limit in areas where the total MPE limit is exceeded
   4. Each transmitter operating with a duty cycle greater than 50 percent
   Show answer

   C. Each transmitter that produces 5 percent or more of its MPE limit in areas where the total MPE limit is exceeded

5. E0A05 What hazard is created by operating at microwave frequencies?

   1. Microwaves are ionizing radiation
   2. The high gain antennas commonly used can result in high exposure levels
   3. Microwaves are in the frequency range where wave velocity is higher
   4. The extremely high frequency energy can damage the joints of antenna structures
   Show answer

   B. The high gain antennas commonly used can result in high exposure levels

6. E0A06 Why are there separate electric (E) and magnetic (H) MPE limits at frequencies below 300 MHz?

   1. The body reacts to electromagnetic radiation from both the E and H fields
   2. Ground reflections and scattering cause the field strength to vary with location
   3. E field and H field radiation intensity peaks can occur at different locations
   4. All these choices are correct
   Show answer

   D. All these choices are correct

7. E0A07 What is meant by “100% tie-off” regarding tower safety?

   1. All loose ropes and guys secured to a fixed structure
   2. At least one lanyard attached to the tower at all times
   3. All tools secured to the climber’s harness
   4. All circuit breakers feeding power to the tower must be tied closed with tape, cable, or ties
   Show answer

   B. At least one lanyard attached to the tower at all times

8. E0A08 What does SAR measure?

   1. Signal attenuation ratio
   2. Signal amplification rating
   3. The rate at which RF energy is absorbed by the body
   4. The rate of RF energy reflected from stationary terrain
   Show answer

   C. The rate at which RF energy is absorbed by the body

9. E0A09 Which of the following types of equipment are exempt from RF exposure evaluations?

   1. Transceivers with less than 7 watts of RF output
   2. Antennas that radiate only in the near field
   3. Hand-held transceivers sold before May 3, 2021
   4. Dish antennas less than one meter in diameter
   Show answer

   C. Hand-held transceivers sold before May 3, 2021

10. E0A10 When must an RF exposure evaluation be performed on an amateur station operating on 80 meters?

    1. An evaluation must always be performed
    2. When the ERP of the station is less than 10 watts
    3. When the station’s operating mode is CW
    4. When the output power from the transmitter is less than 100 watts
    Show answer

    A. An evaluation must always be performed

11. E0A11 To what should lanyards be attached while climbing?

    1. Antenna mast
    2. Guy brackets
    3. Tower rungs
    4. Tower legs
    Show answer

    D. Tower legs

12. E0A12 Where should a shock-absorbing lanyard be attached to a tower when working above ground?

    1. Above the climber’s head level
    2. To the belt of the fall-arrest harness
    3. Even with the climber's waist
    4. To the next lowest set of guys
    Show answer

    A. Above the climber’s head level

Questions: NCVEC Question Pool Committee (public domain). Pool valid July 1, 2024 – June 30, 2028.