Technician › T0
T0 Safety
36 questions in the pool. Your exam will include 3, one from each group below.
T0A
Power circuits and hazards: hazardous voltages, fuses and circuit breakers, grounding, electrical code compliance; Lightning protection; Battery safety
- T0A01Which of the following is a safety hazard of a 12-volt storage battery that lacks internal protection circuitry?
- T0A02What health hazard is posed by electrical current flowing through the body?
- T0A03In the United States, what circuit does black wire insulation indicate in a three-wire 120 V AC cable?
- T0A04What is the purpose of a fuse in an electrical circuit?
- T0A05Why should a 5-ampere fuse never be replaced with a 20-ampere fuse?
- T0A06What is a good way to guard against electrical shock at your station?
- T0A07Where should a lightning arrester be installed in a coaxial feed line?
- T0A08Where should a fuse or circuit breaker be installed in a 120V AC power circuit?
- T0A09What should be done to all external ground rods or earth connections?
- T0A10What hazard exists when rapidly charging or discharging an unprotected battery?
- T0A11What hazard exists in a power supply immediately after turning it off?
- T0A12Which of the following precautions should be taken when measuring high voltages with a voltmeter?
T0B
Antenna safety: tower safety and grounding, installing antennas, antenna supports
- T0B01Which of the following is good practice when installing ground wires on a tower for lightning protection?
- T0B02What is required when climbing an antenna tower?
- T0B03Under what circumstances is it safe to climb a tower without a helper or observer?
- T0B04Which of the following is an important safety precaution to observe when putting up an antenna tower?
- T0B05What is the purpose of a safety wire through a turnbuckle used to tension guy lines?
- T0B06What is the minimum safe distance from a power line to allow when installing an antenna?
- T0B07Which of the following is an important safety rule to remember when using a crank-up tower?
- T0B08Which is a proper grounding method for a tower?
- T0B09Why should you avoid attaching an antenna to a utility pole?
- T0B10Which of the following is true when installing grounding conductors used for lightning protection?
- T0B11Which of the following establishes grounding requirements for an amateur radio tower or antenna?
T0C
RF hazards: radiation exposure, proximity to antennas, recognized safe power levels, radiation types, duty cycle
- T0C01What type of radiation are radio signals?
- T0C02Which of the following bands has the lowest maximum permissible exposure for RF safety?
- T0C03How does the allowable power density for RF safety change if duty cycle changes from 100 percent to 50 percent?
- T0C04What factors affect the RF exposure of people near an amateur station antenna?
- T0C05Why do exposure limits vary with frequency?
- T0C06Which of the following is an acceptable method to determine whether your station complies with FCC RF exposure regulations?
- T0C07What hazard is created by touching an antenna during a transmission?
- T0C08Which of the following actions can reduce exposure to RF radiation?
- T0C09How can you make sure your station stays in compliance with RF safety regulations?
- T0C10Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?
- T0C11What is the definition of duty cycle during the averaging time for RF exposure?
- T0C12How does RF radiation differ from ionizing radiation (radioactivity)?
- T0C13Who is responsible for ensuring that no person is exposed to RF energy above the FCC exposure limits?