SUBELEMENT G0 – ELECTRICAL AND RF SAFETY Flashcards
G0A01 (A)
What is one way that RF energy can affect human body tissue?
A. It heats body tissue
G0A02 (D)
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 of these choices are correct
G0A03 (D) [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 of these choices are correct
G0A04 (D)
What does “time averaging” mean in reference to RF radiation exposure?
D. The total RF exposure averaged over a certain time
G0A05 (A)
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
G0A06 (D)
What precaution should be taken when installing a ground-mounted antenna?
D. It should be installed such that it is protected against unauthorized access
G0A07 (A)
What effect does transmitter duty cycle have when evaluating RF exposure?
A. A lower transmitter duty cycle permits greater short-term exposure levels
G0A08 (C)
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?
C. Perform a routine RF exposure evaluation
G0A09 (B)
What type of instrument can be used to accurately measure an RF field?
B. A calibrated field strength meter with a calibrated antenna
G0A10 (D)
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?
D. Take precautions to ensure that the antenna cannot be pointed in their direction
G0A11 (C)
What precaution should you take if you install an indoor transmitting antenna?
C. Make sure that MPE limits are not exceeded in occupied areas
G0A12 (B)
What precaution should you take whenever you make adjustments or repairs to an antenna?
B. Turn off the transmitter and disconnect the feed line
G0B01 (A)
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
G0B02 (C)
What is the minimum wire size that may be safely used for a circuit that draws up to 20 amperes of continuous current?
C. AWG number 12
G0B03 (D)
Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?
D. 15 amperes
G0B04 (A)
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
G0B05 (B)
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?
B. Current flowing from one or more of the voltage-carrying wires directly to ground
G0B06 (D)
Why must the metal enclosure of every item of station equipment be grounded?
D. It ensures that hazardous voltages cannot appear on the chassis
G0B07 (B)
Which of these choices should be observed when climbing a tower using a safety belt or harness?
B. Confirm that the belt is rated for the weight of the climber and that it is within its allowable service life
G0B08 (B)
What should be done by any person preparing to climb a tower that supports electrically powered devices?
B. Make sure all circuits that supply power to the tower are locked out and tagged
G0B09 (D)
Why should soldered joints not be used with the wires that connect the base of a tower to a system of ground rods?
D. A soldered joint will likely be destroyed by the heat of a lightning strike
G0B10 (A)
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
G0B11 (D)
Which of the following is good practice for lightning protection grounds?
D. They must be bonded together with all other grounds
G0B12 (C)
What is the purpose of a power supply interlock?
C. To ensure that dangerous voltages are removed if the cabinet is opened
G0B13 (A)
What must you do when powering your house from an emergency generator?
A. Disconnect the incoming utility power feed
G0B14 (C)
Which of the following is covered by the National Electrical Code?
C. Electrical safety inside the ham shack
G0B15 (A)
Which of the following is true of an emergency generator installation?
A. The generator should be located in a well-ventilated area
