The T0 section of the Technician test contains information on AC power circuits, antenna installation, RF hazards.


The T0A section covers AC power circuits; hazardous voltages, fuses and circuit breakers, grounding, lightning protection, battery safety, electrical code.
Click "Expand" to reveal the questions.


Which is a commonly accepted value for the lowest voltage that can cause a dangerous electric shock?
30 volts


How does current flowing through the body cause a health hazard?
By heating tissue
It disrupts the electrical functions of cells
It causes involuntary muscle contractions
All of these choices are correct


What is connected to the green wire in a three-wire electrical AC plug?
Safety ground


What is the purpose of a fuse in an electrical circuit?
To interrupt power in case of overload


Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse?
Excessive current could cause a fire


What is a good way to guard against electrical shock at your station?
Use three-wire cords and plugs for all AC powered equipment
Connect all AC powered station equipment to a common safety ground
Use a circuit protected by a ground-fault interrupter
All of these choices are correct


Which of these precautions should be taken when installing devices for lightning protection in a coaxial cable feedline?
Ground all of the protectors to a common plate which is in turn connected to an external ground


What is one way to recharge a 12-volt lead-acid station battery if the commercial power is out?
Connect the battery to a car's battery and run the engine


What kind of hazard is presented by a conventional 12-volt storage battery?
Explosive gas can collect if not properly vented


What can happen if a lead-acid storage battery is charged or discharged too quickly?
The battery could overheat and give off flammable gas or explode


Which of the following is good practice when installing ground wires on a tower for lightning protection?
Ensure that connections are short and direct


What kind of hazard might exist in a power supply when it is turned off and disconnected?
You might receive an electric shock from stored charge in large capacitors


What safety equipment should always be included in home-built equipment that is powered from 120V AC power circuits?
A fuse or circuit breaker in series with the AC "hot" conductor


The T0B section covers antenna installation; tower safety, overhead power lines.
Click "Expand" to reveal the questions.


When should members of a tower work team wear a hard hat and safety glasses?
At all times when any work is being done on the tower


What is a good precaution to observe before climbing an antenna tower?
Put on a climbing harness and safety glasses


Under what circumstances is it safe to climb a tower without a helper or observer?


Which of the following is an important safety precaution to observe when putting up an antenna tower?
Look for and stay clear of any overhead electrical wires


What is the purpose of a gin pole?
To lift tower sections or antennas


What is the minimum safe distance from a power line to allow when installing an antenna?
So that if the antenna falls unexpectedly, no part of it can come closer than 10 feet to the power wires


Which of the following is an important safety rule to remember when using a crank-up tower?
This type of tower must never be climbed unless it is in the fully retracted position


What is considered to be a proper grounding method for a tower?
Separate eight-foot long ground rods for each tower leg, bonded to the tower and each other


Why should you avoid attaching an antenna to a utility pole?
The antenna could contact high-voltage power wires


Which of the following is true concerning grounding conductors used for lightning protection?
Sharp bends must be avoided


Which of the following establishes grounding requirements for an amateur radio tower or antenna?
Local electrical codes


The T0C section covers RF hazards; radiation exposure, proximity to antennas, recognized safe power levels, exposure to others.
Click "Expand" to reveal the questions.


What type of radiation are VHF and UHF radio signals?
Non-ionizing radiation


Which of the following frequencies has the lowest Maximum Permissible Exposure limit?
50 MHz


What is the maximum power level that an amateur radio station may use at VHF frequencies before an RF exposure evaluation is required?
50 watts PEP at the antenna


What factors affect the RF exposure of people near an amateur station antenna?
Frequency and power level of the RF field
Distance from the antenna to a person
Radiation pattern of the antenna
All of these choices are correct


Why do exposure limits vary with frequency?
The human body absorbs more RF energy at some frequencies than at others


Which of the following is an acceptable method to 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 of these choices are correct


What could happen if a person accidentally touched your antenna while you were transmitting?
They might receive a painful RF burn


Which of the following actions might amateur operators take to prevent exposure to RF radiation in excess of FCC-supplied limits?
Relocate antennas


How can you make sure your station stays in compliance with RF safety regulations?
By re-evaluating the station whenever an item of equipment is changed


Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?
It affects the average exposure of people to radiation


What is meant by "duty cycle" when referring to RF exposure?
The ratio of on-air time to total operating time of a transmitted signal

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