General Class Exam Question Pool- Subelement G-0

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SUBELEMENT G0 – ELECTRICAL AND RF SAFETY [2 Exam Questions – 2 Groups]



G0A – RF safety principles, rules and guidelines; routine station evaluation



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

A. It heats body tissue

B. It causes radiation poisoning

C. It causes the blood count to reach a dangerously low level

D. It cools body tissue





Which of the following properties is important in estimating whether an RF signal exceeds the maximum permissible exposure (MPE)?

A. Its duty cycle

B. Its frequency

C. Its power density

D. All these choices are correct




G0A03  [97.13(c)(1)]

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

A. By calculation based on FCC OET Bulletin 65

B. By calculation based on computer modeling

C. By measurement of field strength using calibrated equipment

D. All these choices are correct





What does “time averaging” mean in reference to RF radiation exposure?

A. The average amount of power developed by the transmitter over a specific 24-hour period

B. The average time it takes RF radiation to have any long-term effect on the body

C. The total time of the exposure

D. The total RF exposure averaged over a certain time





What must you do if an evaluation of your station shows RF energy radiated from your station exceeds permissible limits?

A. Take action to prevent human exposure to the excessive RF fields

B. File an Environmental Impact Statement (EIS-97) with the FCC

C. Secure written permission from your neighbors to operate above the controlled MPE limits

D. All these choices are correct





What precaution should be taken when installing a ground-mounted antenna?

A. It should not be installed higher than you can reach

B. It should not be installed in a wet area

C. It should be limited to 10 feet in height

D. It should be installed such that it is protected against unauthorized access





What effect does transmitter duty cycle have when evaluating RF exposure?

A. A lower transmitter duty cycle permits greater short-term exposure levels

B. A higher transmitter duty cycle permits greater short-term exposure levels

C. Low duty cycle transmitters are exempt from RF exposure evaluation requirements

D. High duty cycle transmitters are exempt from RF exposure requirements





Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations when transmitter power exceeds levels specified in FCC Part 97.13?

A. Post a copy of FCC Part 97.13 in the station

B. Post a copy of OET Bulletin 65 in the station

C. Perform a routine RF exposure evaluation

D. Contact the FCC for a visit to conduct a station evaluation





What type of instrument can be used to accurately measure an RF field?

A. A receiver with an S meter

B. A calibrated field strength meter with a calibrated antenna

C. An SWR meter with a peak-reading function

D. An oscilloscope with a high-stability crystal marker generator





What is one thing that can be done if evaluation shows that a neighbor might receive more than the allowable limit of RF exposure from the main lobe of a directional antenna?

A. Change to a non-polarized antenna with higher gain

B. Post a warning sign that is clearly visible to the neighbor

C. Use an antenna with a higher front-to-back ratio

D. Take precautions to ensure that the antenna cannot be pointed in their direction





What precaution should you take if you install an indoor transmitting antenna?

A. Locate the antenna close to your operating position to minimize feed-line radiation

B. Position the antenna along the edge of a wall to reduce parasitic radiation

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

D. Make sure the antenna is properly shielded




G0B – Station safety: electrical shock, safety grounding, fusing, interlocks, wiring, antenna and tower safety



Which wire or wires in a four-conductor connection should be attached to fuses or circuit breakers in a device operated from a 240 VAC single phase source?

A. Only the two wires carrying voltage

B. Only the neutral wire

C. Only the ground wire

D. All wires





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

A. AWG number 20

B. AWG number 16

C. AWG number 12

D. AWG number 8





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

A. 100 amperes

B. 60 amperes

C. 30 amperes

D. 15 amperes





Which of the following is a primary reason for not placing a gasoline-fueled generator inside an occupied area?

A. Danger of carbon monoxide poisoning

B. Danger of engine over torque

C. Lack of oxygen for adequate combustion

D. Lack of nitrogen for adequate combustion





Which of the following conditions will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a device?

A. Current flowing from one or more of the voltage-carrying wires to the neutral wire

B. Current flowing from one or more of the voltage-carrying wires directly to ground

C. Overvoltage on the voltage-carrying wires

D. All these choices are correct





Which of the following is covered by the National Electrical Code?

A. Acceptable bandwidth limits

B. Acceptable modulation limits

C. Electrical safety inside the ham shack

D. RF exposure limits of the human body





Which of these choices should be observed when climbing a tower using a safety belt or harness?

A. Never lean back and rely on the belt alone to support your weight

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

C. Ensure that all heavy tools are securely fastened to the belt D-ring

D. All these choices are correct





What should be done by any person preparing to climb a tower that supports electrically powered devices?

A. Notify the electric company that a person will be working on the tower

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

C. Unground the base of the tower

D. All these choices are correct





Which of the following is true of an emergency generator installation?

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

B. The generator must be insulated from ground

C. Fuel should be stored near the generator for rapid refueling in case of an emergency

D. All these choices are correct





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

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

B. High voltages can cause lead-tin solder to disintegrate suddenly

C. Tin in the solder can “cold flow,” causing shorts in the circuit

D. RF energy can convert the lead into a poisonous gas





Which of the following is good practice for lightning protection grounds?

A. They must be bonded to all buried water and gas lines

B. Bends in ground wires must be made as close as possible to a right angle

C. Lightning grounds must be connected to all ungrounded wiring

D. They must be bonded together with all other grounds





What is the purpose of a power supply interlock?

A. To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty

B. To shut down the unit if it becomes too hot

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

D. To shut off the power supply if too much voltage is produced





What must you do when powering your house from an emergency generator?

A. Disconnect the incoming utility power feed

B. Insure that the generator is not grounded

C. Insure that all lightning grounds are disconnected

D. All these choices are correct





What precaution should you take whenever you adjust or repair an antenna?

A. Ensure that you and the antenna structure are grounded

B. Turn off the transmitter and disconnect the feed line

C. Wear a radiation badge

D. All these choices are correct


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Subelement G-6           Subelement G-7          Subelement G-8          Subbelement G-9          Subelement G-0