SUBELEMENT T0 – Electrical and RF Safety – 3 exam questions – 3 groups
T0A AC power circuits, hazardous voltages, fuses and circuit breakers, grounding, lightning protection, battery safety, electrical code compliance.
What is a commonly accepted value for the lowest voltage that can cause a dangerous electric shock?
What is the lowest amount of electrical current flowing through the human body that is likely to cause death?
What is connected to the green wire in a three-wire electrical plug?
What is the purpose of a fuse in an electrical circuit?
What might happen if you install a 20-ampere fuse in your transceiver in the place of a 5-ampere fuse?
What is a good way to guard against electrical shock at your station?
What is the most important thing to consider when installing an emergency disconnect switch at your station?
What precautions should be taken when a lightning storm is expected?
What is one way to recharge a 12-volt battery if the commercial power is out?
What kind of hazard is presented by a conventional 12-volt storage battery?
What can happen if a storage battery is charged or discharged too quickly?
What is the most important reason to have a lightning protection system for your amateur radio station?
What kind of hazard might exist in a power supply when it is turned off and disconnected?
T0B Antenna installation, tower safety, overhead power lines.
Why should you wear a hard hat and safety glasses if you are on the ground helping someone work on an antenna tower?
What is a good precaution to observe before climbing an antenna tower?
What should you do before you climb a tower?
What is an important consideration when putting up an antenna?
What must be considered when erecting an antenna near an airport?
What is the most important safety precaution to observe when putting up an antenna tower?
How should the guy wires for an antenna tower be installed?
What is a safe distance from a power line to allow when installing an antenna?
What is the most important safety rule to remember when using a crank-up tower?
Why is stainless steel hardware used on many antennas instead of other metals?
What is considered to be an adequate ground for a tower?
T0C RF hazards, radiation exposure, RF heating hazards, proximity to antennas, recognized safe power levels, hand held safety, exposure to others.
What type of radiation are VHF and UHF radio signals?
When can radio waves cause injury to the human body?
What is the maximum power level that an amateur radio station may use at frequencies above 30 MHz before an RF exposure evaluation is required?
What factors affect the RF exposure of people near an amateur transmitter?
Why must the frequency of an RF source be considered when evaluating RF radiation exposure?
How can you determine that your station complies with FCC RF exposure regulations?
What could happen if a person accidentally touched your antenna while you were transmitting?
What action might amateur operators take to prevent exposure to RF radiation in excess of FCC supplied limits?
How can you make sure your station stays in compliance with RF safety regulations?
Which of the following units of measurement is used to measure RF radiation exposure?
Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?