Sub Element GO: Electrical and RF Safety Flashcards
What is one way that RF energy can affect human body tissue?
It heats body tissue
Which of the following properties is important in estimating whether an RF signal exceeds the maximum permissible exposure (MPE)?
Its duty cycle
Its frequency
Its power density
All these choices are correct
How can you determine that your station complies with FCC RF exposure regulations?
By calculation based on FCC OET Bulletin 65
By calculation based on computer modeling
By measurement of field strength using calibrated equipment
All these choices are correct
What does “time averaging” mean in reference to RF radiation exposure?
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?
Take action to prevent human exposure to the excessive RF fields
What precaution should be taken when installing a ground-mounted antenna?
It should be installed such that it is protected against unauthorized access
What effect does transmitter duty cycle have when evaluating RF exposure?
A lower transmitter duty cycle permits greater short-term exposure levels
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?
Perform a routine RF exposure evaluation
What type of instrument can be used to accurately measure an RF field?
A calibrated field strength meter with a calibrated antenna
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?
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?
Make sure that MPE limits are not exceeded in occupied areas
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?
Only the two wires carrying voltage
According the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20 ampere circuit breaker?
AWG number 12
Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?
15 amperes
Which of the following is a primary reason for not placing a gasoline-fueled generator inside an occupied area?
Danger of carbon monoxide poisoning
