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General exam G0: Electrical and RF Safety

All 25 questions in subelement G0. The exam asks 2 of them, one from each group (G0A, G0B). Answers are hidden until you open them.

Drill these 25 questions Full practice exam

G0A

  1. G0A01 What is one way that RF energy can affect human body tissue?

    1. It heats body tissue
    2. It causes radiation poisoning
    3. It causes the blood count to reach a dangerously low level
    4. It cools body tissue
    Show answer

    A. It heats body tissue

  2. G0A02 Which of the following is used to determine RF exposure from a transmitted signal?

    1. Its duty cycle
    2. Its frequency
    3. Its power density
    4. All these choices are correct
    Show answer

    D. All these choices are correct

  3. G0A03 How can you determine that your station complies with FCC RF exposure regulations?

    1. By calculation based on FCC OET Bulletin 65
    2. By calculation based on computer modeling
    3. By measurement of field strength using calibrated equipment
    4. All these choices are correct
    Show answer

    D. All these choices are correct (97.13(c)(1))

  4. G0A04 What does “time averaging” mean when evaluating RF radiation exposure?

    1. The average amount of power developed by the transmitter over a specific 24-hour period
    2. The average time it takes RF radiation to have any long-term effect on the body
    3. The total time of the exposure
    4. The total RF exposure averaged over a certain period
    Show answer

    D. The total RF exposure averaged over a certain period

  5. G0A05 What must you do if an evaluation of your station shows that the RF energy radiated by your station exceeds permissible limits for possible human absorption?

    1. Take action to prevent human exposure to the excessive RF fields
    2. File an Environmental Impact Statement (EIS-97) with the FCC
    3. Secure written permission from your neighbors to operate above the controlled MPE limits
    4. All these choices are correct
    Show answer

    A. Take action to prevent human exposure to the excessive RF fields (97.13(c)(2), 1.1307(b))

  6. G0A06 What must you do if your station fails to meet the FCC RF exposure exemption criteria?

    1. Perform an RF exposure evaluation in accordance with FCC OET Bulletin 65
    2. Contact the FCC for permission to transmit
    3. Perform an RF exposure evaluation in accordance with World Meteorological Organization guidelines
    4. Use an FCC-approved band-pass filter
    Show answer

    A. Perform an RF exposure evaluation in accordance with FCC OET Bulletin 65 (97.13(c)(2), 1.1307(1)(b)(3)(i))

  7. G0A07 What is the effect of modulation duty cycle on RF exposure?

    1. A lower duty cycle permits greater power levels to be transmitted
    2. A higher duty cycle permits greater power levels to be transmitted
    3. Low duty cycle transmitters are exempt from RF exposure evaluation requirements
    4. High duty cycle transmitters are exempt from RF exposure requirements
    Show answer

    A. A lower duty cycle permits greater power levels to be transmitted

  8. G0A08 Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations?

    1. Post a copy of FCC Part 97.13 in the station
    2. Notify neighbors within a 100-foot radius of the antenna of the existence of the station and power levels
    3. Perform a routine RF exposure evaluation and prevent access to any identified high exposure areas
    4. All these choices are correct
    Show answer

    C. Perform a routine RF exposure evaluation and prevent access to any identified high exposure areas (97.13(c)(2))

  9. G0A09 What type of instrument can be used to accurately measure an RF field strength?

    1. A receiver with digital signal processing (DSP) noise reduction
    2. A calibrated field strength meter with a calibrated antenna
    3. An SWR meter with a peak-reading function
    4. An oscilloscope with a high-stability crystal marker generator
    Show answer

    B. A calibrated field strength meter with a calibrated antenna

  10. G0A10 What should be done if evaluation shows that a neighbor might experience more than the allowable limit of RF exposure from the main lobe of a directional antenna?

    1. Change to a non-polarized antenna with higher gain
    2. Use an antenna with a higher front-to-back ratio
    3. Take precautions to ensure that the antenna cannot be pointed in their direction when they are present
    4. All these choices are correct
    Show answer

    C. Take precautions to ensure that the antenna cannot be pointed in their direction when they are present

  11. G0A11 What precaution should be taken if you install an indoor transmitting antenna?

    1. Locate the antenna close to your operating position to minimize feed-line radiation
    2. Position the antenna along the edge of a wall to reduce parasitic radiation
    3. Make sure that MPE limits are not exceeded in occupied areas
    4. Make sure the antenna is properly shielded
    Show answer

    C. Make sure that MPE limits are not exceeded in occupied areas

  12. G0A12 What stations are subject to the FCC rules on RF exposure?

    1. All commercial stations; amateur radio stations are exempt
    2. Only stations with antennas lower than one wavelength above the ground
    3. Only stations transmitting more than 500 watts PEP
    4. All stations with a time-averaged transmission of more than one milliwatt
    Show answer

    D. All stations with a time-averaged transmission of more than one milliwatt (1.1307(1)(b)(3)(i)(A))

G0B

  1. G0B01 Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers?

    1. Only the hot wires
    2. Only the neutral wire
    3. Only the ground wire
    4. All wires
    Show answer

    A. Only the hot wires

  2. G0B02 According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?

    1. AWG number 20
    2. AWG number 16
    3. AWG number 12
    4. AWG number 8
    Show answer

    C. AWG number 12

  3. G0B03 Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?

    1. 30 amperes
    2. 25 amperes
    3. 20 amperes
    4. 15 amperes
    Show answer

    D. 15 amperes

  4. G0B04 Where should the station’s lightning protection ground system be located?

    1. As close to the station equipment as possible
    2. Outside the building
    3. Next to the closest power pole
    4. Parallel to the water supply line
    Show answer

    B. Outside the building

  5. G0B05 Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?

    1. Current flowing from one or more of the hot wires to the neutral wire
    2. Current flowing from one or more of the hot wires directly to ground
    3. Overvoltage on the hot wires
    4. All these choices are correct
    Show answer

    B. Current flowing from one or more of the hot wires directly to ground

  6. G0B06 Which of the following is covered by the National Electrical Code?

    1. Acceptable bandwidth limits
    2. Acceptable modulation limits
    3. Electrical safety of the station
    4. RF exposure limits of the human body
    Show answer

    C. Electrical safety of the station

  7. G0B07 Which of these choices should be observed when climbing a tower using a safety harness?

    1. Always hold on to the tower with one hand
    2. Confirm that the harness is rated for the weight of the climber and that it is within its allowable service life
    3. Ensure that all heavy tools are securely fastened to the harness
    4. All these choices are correct
    Show answer

    B. Confirm that the harness is rated for the weight of the climber and that it is within its allowable service life

  8. G0B08 What should be done before climbing a tower that supports electrically powered devices?

    1. Notify the electric company that a person will be working on the tower
    2. Make sure all circuits that supply power to the tower are locked out and tagged
    3. Unground the base of the tower
    4. All these choices are correct
    Show answer

    B. Make sure all circuits that supply power to the tower are locked out and tagged

  9. G0B09 Which of the following is true of an emergency generator installation?

    1. The generator should be operated in a well-ventilated area
    2. The generator must be insulated from ground
    3. Fuel should be stored near the generator for rapid refueling in case of an emergency
    4. All these choices are correct
    Show answer

    A. The generator should be operated in a well-ventilated area

  10. G0B10 Which of the following is a danger from lead-tin solder?

    1. Lead can contaminate food if hands are not washed carefully after handling the solder
    2. High voltages can cause lead-tin solder to disintegrate suddenly
    3. Tin in the solder can “cold flow,” causing shorts in the circuit
    4. RF energy can convert the lead into a poisonous gas
    Show answer

    A. Lead can contaminate food if hands are not washed carefully after handling the solder

  11. G0B11 Which of the following is required for lightning protection ground rods?

    1. They must be bonded to all buried water and gas lines
    2. Bends in ground wires must be made as close as possible to a right angle
    3. Lightning grounds must be connected to all ungrounded wiring
    4. They must be bonded together with all other grounds
    Show answer

    D. They must be bonded together with all other grounds

  12. G0B12 What is the purpose of a power supply interlock?

    1. To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty
    2. To shut down the unit if it becomes too hot
    3. To ensure that dangerous voltages are removed if the cabinet is opened
    4. To shut off the power supply if too much voltage is produced
    Show answer

    C. To ensure that dangerous voltages are removed if the cabinet is opened

  13. G0B13 Where should lightning arrestors be located?

    1. Where the feed lines enter the building
    2. On the antenna, opposite the feed point
    3. In series with each ground lead
    4. At the closest power pole ground electrode
    Show answer

    A. Where the feed lines enter the building

Questions: NCVEC Question Pool Committee (public domain). Pool valid July 1, 2023 – June 30, 2027.