Ham Radio - Technician Class - Question Pool 2023 with
answers
T0A01 Which is a commonly accepted value for the lowest voltage that can cause
a dangerous electric shock? A. 12 volts B. 30 volts C. 120 volts D. 300 volts
(B)
T0A02 How does current flowing through the body cause a health hazard? A. By
heating tissue B. It disrupts the electrical functions of cells C. It causes
involuntary muscle contractions D. All of these choices are correct
(D)
T0A03 What is connected to the green wire in a three-wire electrical AC plug? A.
Neutral B. Hot C. Safety ground D. The white wire
(C)
T0A04 What is the purpose of a fuse in an electrical circuit? A. To prevent power
supply ripple from damaging a circuit B. To interrupt power in case of overload C.
To limit current to prevent shocks D. All of these choices are correct
(B)
T0A05 Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere
fuse? A. The larger fuse would be likely to blow because it is rated for higher
current B. The power supply ripple would greatly increase C. Excessive current
could cause a fire D. All of these choices are correct
(C)
T0A06 What is a good way to guard against electrical shock at your station? A.
Use three-wire cords and plugs for all AC powered equipment B. Connect all AC
powered station equipment to a common safety ground C. Use a circuit protected
by a ground-fault interrupter D. All of these choices are correct
(D)
T0A07 Which of these precautions should be taken when installing devices for
lightning protection in a coaxial cable feedline? A. Include a parallel bypass
switch for each protector so that it can be switched out of the circuit when
running high power B. Include a series switch in the ground line of each protector
to prevent RF overload from inadvertently damaging the protector C. Keep the
ground wires from each protector separate and connected to station ground D.
Ground all of the protectors to a common plate which is in turn connected to an
external ground
(D)
T0A08 What is one way to recharge a 12-volt lead-acid station battery if the
commercial power is out? A. Cool the battery in ice for several hours B. Add acid
to the battery C. Connect the battery to a car's battery and run the engine D. All of
these choices are correct
(C)
T0A09 What kind of hazard is presented by a conventional 12-volt storage
battery? A. It emits ozone which can be harmful to the atmosphere B. Shock
hazard due to high voltage C. Explosive gas can collect if not properly vented D.
All of these choices are correct
,(C)
T0A10 What can happen if a lead-acid storage battery is charged or discharged
too quickly? A. The battery could overheat and give off flammable gas or explode
B. The voltage can become reversed C. The "memory effect" will reduce the
capacity of the battery D. All of these choices are correct
(A)
T0A11 Which of the following is good practice when installing ground wires on a
tower for lightning protection? A. Put a loop in the ground connection to prevent
water damage to the ground system B. Make sure that all bends in the ground
wires are clean, right angle bends C. Ensure that connections are short and direct
D. All of these choices are correct
(C)
T0A12 What kind of hazard might exist in a power supply when it is turned off and
disconnected? A. Static electricity could damage the grounding system B.
Circulating currents inside the transformer might cause damage C. The fuse
might blow if you remove the cover D. You might receive an electric shock from
stored charge in large capacitors
(D)
T0A13 What safety equipment should always be included in home-built
equipment that is powered from 120V AC power circuits? A. A fuse or circuit
breaker in series with the AC "hot" conductor B. An AC voltmeter across the
incoming power source C. An inductor in series with the AC power source D. A
capacitor across the AC power source
(A)
T0B01 When should members of a tower work team wear a hard hat and safety
glasses? A. At all times except when climbing the tower B. At all times except
when belted firmly to the tower C. At all times when any work is being done on
the tower D. Only when the tower exceeds 30 feet in height
(C)
T0B02 What is a good precaution to observe before climbing an antenna tower?
A. Make sure that you wear a grounded wrist strap B. Remove all tower grounding
connections C. Put on a climbing harness and safety glasses D. All of the these
choices are correct
(C)
T0B03 Under what circumstances is it safe to climb a tower without a helper or
observer? A. When no electrical work is being performed B. When no mechanical
work is being performed C. When the work being done is not more than 20 feet
above the ground D. Never
(D)
T0B04 Which of the following is an important safety precaution to observe when
putting up an antenna tower? A. Wear a ground strap connected to your wrist at
all times B. Insulate the base of the tower to avoid lightning strikes C. Look for
and stay clear of any overhead electrical wires D. All of these choices are correct
(C)
,T0B05 What is the purpose of a gin pole? A. To temporarily replace guy wires B.
To be used in place of a safety harness C. To lift tower sections or antennas D. To
provide a temporary ground
(C)
T0B06 What is the minimum safe distance from a power line to allow when
installing an antenna? A. Half the width of your property B. The height of the
power line above ground C. 1/2 wavelength at the operating frequency D. So that
if the antenna falls unexpectedly, no part of it can come closer than 10 feet to the
power wires
(D)
T0B07 Which of the following is an important safety rule to remember when using
a crank-up tower? A. This type of tower must never be painted B. This type of
tower must never be grounded C. This type of tower must never be climbed
unless it is in the fully retracted position D. All of these choices are correct
(C)
T0B08 What is considered to be a proper grounding method for a tower? A. A
single four-foot ground rod, driven into the ground no more than 12 inches from
the base B. A ferrite-core RF choke connected between the tower and ground C.
Separate eight-foot long ground rods for each tower leg, bonded to the tower and
each other D. A connection between the tower base and a cold water pipe
(C)
T0B09 Why should you avoid attaching an antenna to a utility pole? A. The
antenna will not work properly because of induced voltages B. The utility
company will charge you an extra monthly fee C. The antenna could contact high-
voltage power wires D. All of these choices are correct
(C)
T0B10 Which of the following is true concerning grounding conductors used for
lightning protection? A. Only non-insulated wire must be used B. Wires must be
carefully routed with precise right-angle bends C. Sharp bends must be avoided
D. Common grounds must be avoided
(C)
T0B11 Which of the following establishes grounding requirements for an amateur
radio tower or antenna? A. FCC Part 97 Rules B. Local electrical codes C. FAA
tower lighting regulations D. Underwriters Laboratories' recommended practices
(B)
T0C01 What type of radiation are VHF and UHF radio signals? A. Gamma
radiation B. Ionizing radiation C. Alpha radiation D. Non-ionizing radiation
(D)
T0C02 Which of the following frequencies has the lowest Maximum Permissible
Exposure limit? A. 3.5 MHz B. 50 MHz C. 440 MHz D. 1296 MHz
(B)
T0C03 What is the maximum power level that an amateur radio station may use at
VHF frequencies before an RF exposure evaluation is required? A. 1500 watts
PEP transmitter output B. 1 watt forward power C. 50 watts PEP at the antenna D.
50 watts PEP reflected power
(C)
, T0C04 What factors affect the RF exposure of people near an amateur station
antenna? A. Frequency and power level of the RF field B. Distance from the
antenna to a person C. Radiation pattern of the antenna D. All of these choices
are correct
(D)
T0C05 Why do exposure limits vary with frequency? A. Lower frequency RF fields
have more energy than higher frequency fields B. Lower frequency RF fields do
not penetrate the human body C. Higher frequency RF fields are transient in
nature D. The human body absorbs more RF energy at some frequencies than at
others
(D)
T0C06 Which of the following is an acceptable method to determine that your
station complies with FCC RF exposure regulations? A. By calculation based on
FCC OET Bulletin 65 B. By calculation based on computer modeling C. By
measurement of field strength using calibrated equipment D. All of these choices
are correct
(D)
T0C07 What could happen if a person accidentally touched your antenna while
you were transmitting? A. Touching the antenna could cause television
interference B. They might receive a painful RF burn C. They might develop
radiation poisoning D. All of these choices are correct
(B)
T0C08 Which of the following actions might amateur operators take to prevent
exposure to RF radiation in excess of FCC-supplied limits? A. Relocate antennas
B. Relocate the transmitter C. Increase the duty cycle D. All of these choices are
correct
(A)
T0C09 How can you make sure your station stays in compliance with RF safety
regulations? A. By informing the FCC of any changes made in your station B. By
re-evaluating the station whenever an item of equipment is changed C. By making
sure your antennas have low SWR D. All of these choices are correct
(B)
T0C10 Why is duty cycle one of the factors used to determine safe RF radiation
exposure levels? A. It affects the average exposure of people to radiation B. It
affects the peak exposure of people to radiation C. It takes into account the
antenna feedline loss D. It takes into account the thermal effects of the final
amplifier
(A)
T0C11 What is meant by "duty cycle" when referring to RF exposure? A. The
difference between lowest usable output and maximum rated output power of a
transmitter B. The difference between PEP and average power of an SSB signal C.
The ratio of on-air time to total operating time of a transmitted signal D. The
amount of time the operator spends transmitting
(C)
answers
T0A01 Which is a commonly accepted value for the lowest voltage that can cause
a dangerous electric shock? A. 12 volts B. 30 volts C. 120 volts D. 300 volts
(B)
T0A02 How does current flowing through the body cause a health hazard? A. By
heating tissue B. It disrupts the electrical functions of cells C. It causes
involuntary muscle contractions D. All of these choices are correct
(D)
T0A03 What is connected to the green wire in a three-wire electrical AC plug? A.
Neutral B. Hot C. Safety ground D. The white wire
(C)
T0A04 What is the purpose of a fuse in an electrical circuit? A. To prevent power
supply ripple from damaging a circuit B. To interrupt power in case of overload C.
To limit current to prevent shocks D. All of these choices are correct
(B)
T0A05 Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere
fuse? A. The larger fuse would be likely to blow because it is rated for higher
current B. The power supply ripple would greatly increase C. Excessive current
could cause a fire D. All of these choices are correct
(C)
T0A06 What is a good way to guard against electrical shock at your station? A.
Use three-wire cords and plugs for all AC powered equipment B. Connect all AC
powered station equipment to a common safety ground C. Use a circuit protected
by a ground-fault interrupter D. All of these choices are correct
(D)
T0A07 Which of these precautions should be taken when installing devices for
lightning protection in a coaxial cable feedline? A. Include a parallel bypass
switch for each protector so that it can be switched out of the circuit when
running high power B. Include a series switch in the ground line of each protector
to prevent RF overload from inadvertently damaging the protector C. Keep the
ground wires from each protector separate and connected to station ground D.
Ground all of the protectors to a common plate which is in turn connected to an
external ground
(D)
T0A08 What is one way to recharge a 12-volt lead-acid station battery if the
commercial power is out? A. Cool the battery in ice for several hours B. Add acid
to the battery C. Connect the battery to a car's battery and run the engine D. All of
these choices are correct
(C)
T0A09 What kind of hazard is presented by a conventional 12-volt storage
battery? A. It emits ozone which can be harmful to the atmosphere B. Shock
hazard due to high voltage C. Explosive gas can collect if not properly vented D.
All of these choices are correct
,(C)
T0A10 What can happen if a lead-acid storage battery is charged or discharged
too quickly? A. The battery could overheat and give off flammable gas or explode
B. The voltage can become reversed C. The "memory effect" will reduce the
capacity of the battery D. All of these choices are correct
(A)
T0A11 Which of the following is good practice when installing ground wires on a
tower for lightning protection? A. Put a loop in the ground connection to prevent
water damage to the ground system B. Make sure that all bends in the ground
wires are clean, right angle bends C. Ensure that connections are short and direct
D. All of these choices are correct
(C)
T0A12 What kind of hazard might exist in a power supply when it is turned off and
disconnected? A. Static electricity could damage the grounding system B.
Circulating currents inside the transformer might cause damage C. The fuse
might blow if you remove the cover D. You might receive an electric shock from
stored charge in large capacitors
(D)
T0A13 What safety equipment should always be included in home-built
equipment that is powered from 120V AC power circuits? A. A fuse or circuit
breaker in series with the AC "hot" conductor B. An AC voltmeter across the
incoming power source C. An inductor in series with the AC power source D. A
capacitor across the AC power source
(A)
T0B01 When should members of a tower work team wear a hard hat and safety
glasses? A. At all times except when climbing the tower B. At all times except
when belted firmly to the tower C. At all times when any work is being done on
the tower D. Only when the tower exceeds 30 feet in height
(C)
T0B02 What is a good precaution to observe before climbing an antenna tower?
A. Make sure that you wear a grounded wrist strap B. Remove all tower grounding
connections C. Put on a climbing harness and safety glasses D. All of the these
choices are correct
(C)
T0B03 Under what circumstances is it safe to climb a tower without a helper or
observer? A. When no electrical work is being performed B. When no mechanical
work is being performed C. When the work being done is not more than 20 feet
above the ground D. Never
(D)
T0B04 Which of the following is an important safety precaution to observe when
putting up an antenna tower? A. Wear a ground strap connected to your wrist at
all times B. Insulate the base of the tower to avoid lightning strikes C. Look for
and stay clear of any overhead electrical wires D. All of these choices are correct
(C)
,T0B05 What is the purpose of a gin pole? A. To temporarily replace guy wires B.
To be used in place of a safety harness C. To lift tower sections or antennas D. To
provide a temporary ground
(C)
T0B06 What is the minimum safe distance from a power line to allow when
installing an antenna? A. Half the width of your property B. The height of the
power line above ground C. 1/2 wavelength at the operating frequency D. So that
if the antenna falls unexpectedly, no part of it can come closer than 10 feet to the
power wires
(D)
T0B07 Which of the following is an important safety rule to remember when using
a crank-up tower? A. This type of tower must never be painted B. This type of
tower must never be grounded C. This type of tower must never be climbed
unless it is in the fully retracted position D. All of these choices are correct
(C)
T0B08 What is considered to be a proper grounding method for a tower? A. A
single four-foot ground rod, driven into the ground no more than 12 inches from
the base B. A ferrite-core RF choke connected between the tower and ground C.
Separate eight-foot long ground rods for each tower leg, bonded to the tower and
each other D. A connection between the tower base and a cold water pipe
(C)
T0B09 Why should you avoid attaching an antenna to a utility pole? A. The
antenna will not work properly because of induced voltages B. The utility
company will charge you an extra monthly fee C. The antenna could contact high-
voltage power wires D. All of these choices are correct
(C)
T0B10 Which of the following is true concerning grounding conductors used for
lightning protection? A. Only non-insulated wire must be used B. Wires must be
carefully routed with precise right-angle bends C. Sharp bends must be avoided
D. Common grounds must be avoided
(C)
T0B11 Which of the following establishes grounding requirements for an amateur
radio tower or antenna? A. FCC Part 97 Rules B. Local electrical codes C. FAA
tower lighting regulations D. Underwriters Laboratories' recommended practices
(B)
T0C01 What type of radiation are VHF and UHF radio signals? A. Gamma
radiation B. Ionizing radiation C. Alpha radiation D. Non-ionizing radiation
(D)
T0C02 Which of the following frequencies has the lowest Maximum Permissible
Exposure limit? A. 3.5 MHz B. 50 MHz C. 440 MHz D. 1296 MHz
(B)
T0C03 What is the maximum power level that an amateur radio station may use at
VHF frequencies before an RF exposure evaluation is required? A. 1500 watts
PEP transmitter output B. 1 watt forward power C. 50 watts PEP at the antenna D.
50 watts PEP reflected power
(C)
, T0C04 What factors affect the RF exposure of people near an amateur station
antenna? A. Frequency and power level of the RF field B. Distance from the
antenna to a person C. Radiation pattern of the antenna D. All of these choices
are correct
(D)
T0C05 Why do exposure limits vary with frequency? A. Lower frequency RF fields
have more energy than higher frequency fields B. Lower frequency RF fields do
not penetrate the human body C. Higher frequency RF fields are transient in
nature D. The human body absorbs more RF energy at some frequencies than at
others
(D)
T0C06 Which of the following is an acceptable method to determine that your
station complies with FCC RF exposure regulations? A. By calculation based on
FCC OET Bulletin 65 B. By calculation based on computer modeling C. By
measurement of field strength using calibrated equipment D. All of these choices
are correct
(D)
T0C07 What could happen if a person accidentally touched your antenna while
you were transmitting? A. Touching the antenna could cause television
interference B. They might receive a painful RF burn C. They might develop
radiation poisoning D. All of these choices are correct
(B)
T0C08 Which of the following actions might amateur operators take to prevent
exposure to RF radiation in excess of FCC-supplied limits? A. Relocate antennas
B. Relocate the transmitter C. Increase the duty cycle D. All of these choices are
correct
(A)
T0C09 How can you make sure your station stays in compliance with RF safety
regulations? A. By informing the FCC of any changes made in your station B. By
re-evaluating the station whenever an item of equipment is changed C. By making
sure your antennas have low SWR D. All of these choices are correct
(B)
T0C10 Why is duty cycle one of the factors used to determine safe RF radiation
exposure levels? A. It affects the average exposure of people to radiation B. It
affects the peak exposure of people to radiation C. It takes into account the
antenna feedline loss D. It takes into account the thermal effects of the final
amplifier
(A)
T0C11 What is meant by "duty cycle" when referring to RF exposure? A. The
difference between lowest usable output and maximum rated output power of a
transmitter B. The difference between PEP and average power of an SSB signal C.
The ratio of on-air time to total operating time of a transmitted signal D. The
amount of time the operator spends transmitting
(C)
