Technician Class License Exam Questions

Subelement T0

Electrical safety: AC and DC power circuits; antenna installation; RF hazards

Question Display Options:
Group T0A Power circuits and hazards: hazardous voltages; fuses and circuit breakers; grounding; lightning protection; battery safety; electrical code compliance
T0A01 Which of the following is a safety hazard of a 12-volt storage battery?
T0A02 How does current flowing through the body cause a health hazard?
T0A03 What is connected to the green wire in a three-wire electrical AC plug?
T0A04 What is the purpose of a fuse in an electrical circuit?
T0A05 Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse?
T0A06 What is a good way to guard against electrical shock at your station?
T0A07 Which of these precautions should be taken when installing devices for lightning protection in a coaxial cable feed line?
T0A08 What safety equipment should always be included in home-built equipment that is powered from 120V AC power circuits?
T0A09 What kind of hazard is presented by a conventional 12-volt storage battery?
T0A10 What can happen if a lead-acid storage battery is charged or discharged too quickly?
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Group T0B Antenna safety: tower safety; erecting an antenna support; overhead power lines; installing an antenna
T0B01 When should members of a tower work team wear a hard hat and safety glasses?
T0B02 What is a good precaution to observe before climbing an antenna tower?
T0B03 Under what circumstances is it safe to climb a tower without a helper or observer?
T0B04 Which of the following is an important safety precaution to observe when putting up an antenna tower?
T0B05 What is the purpose of a gin pole?
T0B06 What is the minimum safe distance from a power line to allow when installing an antenna?
T0B07 Which of the following is an important safety rule to remember when using a crank-up tower?
T0B08 What is considered to be a proper grounding method for a tower?
T0B09 Why should you avoid attaching an antenna to a utility pole?
T0B10 Which of the following is true concerning grounding conductors used for lightning protection?
T0B11 Which of the following establishes grounding requirements for an amateur radio tower or antenna?
T0B12 Which of the following is good practice when installing ground wires on a tower for lightning protection?
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Group T0C RF hazards: radiation exposure; proximity to antennas; recognized safe power levels; exposure to others; radiation types; duty cycle
T0C01 What type of radiation are VHF and UHF radio signals?
T0C02 Which of the following frequencies has the lowest value for Maximum Permissible Exposure limit?
T0C03 What is the maximum power level that an amateur radio station may use at VHF frequencies before an RF exposure evaluation is required?
T0C04 What factors affect the RF exposure of people near an amateur station antenna?
T0C05 Why do exposure limits vary with frequency?
T0C06 Which of the following is an acceptable method to determine that your station complies with FCC RF exposure regulations?
T0C07 What could happen if a person accidentally touched your antenna while you were transmitting?
T0C08 Which of the following actions might amateur operators take to prevent exposure to RF radiation in excess of FCC-supplied limits?
T0C09 How can you make sure your station stays in compliance with RF safety regulations?
T0C10 Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?
T0C11 What is the definition of duty cycle during the averaging time for RF exposure?
T0C12 How does RF radiation differ from ionizing radiation (radioactivity)?
T0C13 If the averaging time for exposure is 6 minutes, how much power density is permitted if the signal is present for 3 minutes and absent for 3 minutes rather than being present for the entire 6 minutes?
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