HAM Technician Question Pool 2022 - 2026 with correct
answers
Which of the following is a safety hazard of a 12-volt storage battery?
A. Touching both terminals with the hands can cause electrical shock
B. Shorting the terminals can cause burns, fire, or an explosion
C. RF emissions from a nearby transmitter can cause the electrolyte to emit
poison gas
D. All these choices are correct
B. Shorting the terminals can cause burns, fire, or an explosion
What health hazard is presented by electrical current flowing through the body?
A. It may cause injury by heating tissue
B. It may disrupt the electrical functions of cells
C. It may cause involuntary muscle contractions
D. All these choices are correct
D. All these choices are correct
In the United States, what circuit does black wire insulation indicate in a three-
wire 120 V cable?
A. Neutral
B. Hot
C. Equipment ground
D. Black insulation is never used
B. Hot
What is the purpose of a fuse in an electrical circuit?
A. To prevent power supply ripple from damaging a component
B. To remove power in case of overload
C. To limit current to prevent shocks
D. All these choices are correct
B. To remove power in case of overload
Why should a 5-ampere fuse never be replaced with a 20-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 these choices are correct
C. Excessive current could cause a fire
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. Install mechanical interlocks in high-voltage circuits
D. All these choices are correct
D. All these choices are correct
Where should a lightning arrester be installed in a coaxial feed line?
A. At the output connector of a transceiver
B. At the antenna feed point
,C. At the ac power service panel
D. On a grounded panel near where feed lines enter the building
D. On a grounded panel near where feed lines enter the building
Where should a fuse or circuit breaker be installed in a 120V AC power circuit?
A. In series with the hot conductor only
B. In series with the hot and neutral conductors
C. In parallel with the hot conductor only
D. In parallel with the hot and neutral conductors
A. In series with the hot conductor only
What should be done to all external ground rods or earth connections?
A. Waterproof them with silicone caulk or electrical tape
B. Keep them as far apart as possible
C. Bond them together with heavy wire or conductive strap
D. Tune them for resonance on the lowest frequency of operation
C. Bond them together with heavy wire or conductive strap
What hazard is caused by charging or discharging a battery too quickly?
A. Overheating or out-gassing
B. Excess output ripple
C. Half-wave rectification
D. Inverse memory effect
A. Overheating or out-gassing
What hazard exists in a power supply immediately after turning it off?
A. Circulating currents in the dc filter
B. Leakage flux in the power transformer
C. Voltage transients from kickback diodes
D. Charge stored in filter capacitors
D. Charge stored in filter capacitors
Which of the following precautions should be taken when measuring high
voltages with a voltmeter?
A. Ensure that the voltmeter has very low impedance
B. Ensure that the voltmeter and leads are rated for use at the voltages to be
measured
C. Ensure that the circuit is grounded through the voltmeter
D. Ensure that the voltmeter is set to the correct frequency
B. Ensure that the voltmeter and leads are rated for use at the voltages to be measured
Which of the following is good practice when installing ground wires on a tower
for lightning protection?
A. Put a drip loop in the ground connection to prevent water damage to the
ground system
B. Make sure all ground wire bends are right angles
C. Ensure that connections are short and direct
D. All these choices are correct
C. Ensure that connections are short and direct
What is required when climbing an antenna tower?
A. Have sufficient training on safe tower climbing techniques
B. Use appropriate tie-off to the tower at all times
,C. Always wear an approved climbing harness
D. All these choices are correct
D. All these choices are correct
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. Never
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 these choices are correct
C. Look for and stay clear of any overhead electrical wires
What is the purpose of a safety wire through a turnbuckle used to tension guy
lines?
A. Secure the guy line if the turnbuckle breaks
B. Prevent loosening of the turnbuckle from vibration
C. Provide a ground path for lightning strikes
D. Provide an ability to measure for proper tensioning
B. Prevent loosening of the turnbuckle from vibration
What is the minimum safe distance from a power line to allow when installing an
antenna?
A. Add the height of the antenna to the height of the power line and multiply by a
factor of 1.5
B. The height of the power line above ground
C. 1/2 wavelength at the operating frequency
D. Enough so that if the antenna falls, no part of it can come closer than 10 feet to
the power wires
D. Enough so that if the antenna falls, 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?
A. This type of tower must never be painted
B. This type of tower must never be grounded
C. This type of tower must not be climbed unless it is retracted, or mechanical
safety locking devices have been installed
D. All these choices are correct
C. This type of tower must not be climbed unless it is retracted, or mechanical safety
locking devices have been installed
Which is 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. A connection between the tower base and a cold water pipe
D. Separate eight-foot ground rods for each tower leg, bonded to the tower and
each other
D. Separate eight-foot ground rods for each tower leg, bonded to the tower and each
other
Why should you avoid attaching an antenna to a utility pole?
A. The antenna will not work properly because of induced voltages
B. The 60 Hz radiations from the feed line may increase the SWR
C. The antenna could contact high-voltage power lines
D. All these choices are correct
C. The antenna could contact high-voltage power lines
Which of the following is true when installing grounding conductors used for
lightning protection?
A. Use only non-insulated wire
B. Wires must be carefully routed with precise right-angle bends
C. Sharp bends must be avoided
D. Common grounds must be avoided
C. Sharp bends must be avoided
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. UL recommended practices
B. Local electrical codes
What type of radiation are radio signals?
A. Gamma radiation
B. Ionizing radiation
C. Alpha radiation
D. Non-ionizing radiation
D. Non-ionizing radiation
At which of the following frequencies does maximum permissible exposure have
the lowest value?
A. 3.5 MHz
B. 50 MHz
C. 440 MHz
D. 1296 MHz
B. 50 MHz
How does the allowable power density for RF safety change if duty cycle changes
from 100 percent to 50 percent?
A. It increases by a factor of 3
B. It decreases by 50 percent
C. It increases by a factor of 2
D. There is no adjustment allowed for lower duty cycle
C. It increases by a factor of 2
answers
Which of the following is a safety hazard of a 12-volt storage battery?
A. Touching both terminals with the hands can cause electrical shock
B. Shorting the terminals can cause burns, fire, or an explosion
C. RF emissions from a nearby transmitter can cause the electrolyte to emit
poison gas
D. All these choices are correct
B. Shorting the terminals can cause burns, fire, or an explosion
What health hazard is presented by electrical current flowing through the body?
A. It may cause injury by heating tissue
B. It may disrupt the electrical functions of cells
C. It may cause involuntary muscle contractions
D. All these choices are correct
D. All these choices are correct
In the United States, what circuit does black wire insulation indicate in a three-
wire 120 V cable?
A. Neutral
B. Hot
C. Equipment ground
D. Black insulation is never used
B. Hot
What is the purpose of a fuse in an electrical circuit?
A. To prevent power supply ripple from damaging a component
B. To remove power in case of overload
C. To limit current to prevent shocks
D. All these choices are correct
B. To remove power in case of overload
Why should a 5-ampere fuse never be replaced with a 20-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 these choices are correct
C. Excessive current could cause a fire
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. Install mechanical interlocks in high-voltage circuits
D. All these choices are correct
D. All these choices are correct
Where should a lightning arrester be installed in a coaxial feed line?
A. At the output connector of a transceiver
B. At the antenna feed point
,C. At the ac power service panel
D. On a grounded panel near where feed lines enter the building
D. On a grounded panel near where feed lines enter the building
Where should a fuse or circuit breaker be installed in a 120V AC power circuit?
A. In series with the hot conductor only
B. In series with the hot and neutral conductors
C. In parallel with the hot conductor only
D. In parallel with the hot and neutral conductors
A. In series with the hot conductor only
What should be done to all external ground rods or earth connections?
A. Waterproof them with silicone caulk or electrical tape
B. Keep them as far apart as possible
C. Bond them together with heavy wire or conductive strap
D. Tune them for resonance on the lowest frequency of operation
C. Bond them together with heavy wire or conductive strap
What hazard is caused by charging or discharging a battery too quickly?
A. Overheating or out-gassing
B. Excess output ripple
C. Half-wave rectification
D. Inverse memory effect
A. Overheating or out-gassing
What hazard exists in a power supply immediately after turning it off?
A. Circulating currents in the dc filter
B. Leakage flux in the power transformer
C. Voltage transients from kickback diodes
D. Charge stored in filter capacitors
D. Charge stored in filter capacitors
Which of the following precautions should be taken when measuring high
voltages with a voltmeter?
A. Ensure that the voltmeter has very low impedance
B. Ensure that the voltmeter and leads are rated for use at the voltages to be
measured
C. Ensure that the circuit is grounded through the voltmeter
D. Ensure that the voltmeter is set to the correct frequency
B. Ensure that the voltmeter and leads are rated for use at the voltages to be measured
Which of the following is good practice when installing ground wires on a tower
for lightning protection?
A. Put a drip loop in the ground connection to prevent water damage to the
ground system
B. Make sure all ground wire bends are right angles
C. Ensure that connections are short and direct
D. All these choices are correct
C. Ensure that connections are short and direct
What is required when climbing an antenna tower?
A. Have sufficient training on safe tower climbing techniques
B. Use appropriate tie-off to the tower at all times
,C. Always wear an approved climbing harness
D. All these choices are correct
D. All these choices are correct
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. Never
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 these choices are correct
C. Look for and stay clear of any overhead electrical wires
What is the purpose of a safety wire through a turnbuckle used to tension guy
lines?
A. Secure the guy line if the turnbuckle breaks
B. Prevent loosening of the turnbuckle from vibration
C. Provide a ground path for lightning strikes
D. Provide an ability to measure for proper tensioning
B. Prevent loosening of the turnbuckle from vibration
What is the minimum safe distance from a power line to allow when installing an
antenna?
A. Add the height of the antenna to the height of the power line and multiply by a
factor of 1.5
B. The height of the power line above ground
C. 1/2 wavelength at the operating frequency
D. Enough so that if the antenna falls, no part of it can come closer than 10 feet to
the power wires
D. Enough so that if the antenna falls, 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?
A. This type of tower must never be painted
B. This type of tower must never be grounded
C. This type of tower must not be climbed unless it is retracted, or mechanical
safety locking devices have been installed
D. All these choices are correct
C. This type of tower must not be climbed unless it is retracted, or mechanical safety
locking devices have been installed
Which is 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. A connection between the tower base and a cold water pipe
D. Separate eight-foot ground rods for each tower leg, bonded to the tower and
each other
D. Separate eight-foot ground rods for each tower leg, bonded to the tower and each
other
Why should you avoid attaching an antenna to a utility pole?
A. The antenna will not work properly because of induced voltages
B. The 60 Hz radiations from the feed line may increase the SWR
C. The antenna could contact high-voltage power lines
D. All these choices are correct
C. The antenna could contact high-voltage power lines
Which of the following is true when installing grounding conductors used for
lightning protection?
A. Use only non-insulated wire
B. Wires must be carefully routed with precise right-angle bends
C. Sharp bends must be avoided
D. Common grounds must be avoided
C. Sharp bends must be avoided
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. UL recommended practices
B. Local electrical codes
What type of radiation are radio signals?
A. Gamma radiation
B. Ionizing radiation
C. Alpha radiation
D. Non-ionizing radiation
D. Non-ionizing radiation
At which of the following frequencies does maximum permissible exposure have
the lowest value?
A. 3.5 MHz
B. 50 MHz
C. 440 MHz
D. 1296 MHz
B. 50 MHz
How does the allowable power density for RF safety change if duty cycle changes
from 100 percent to 50 percent?
A. It increases by a factor of 3
B. It decreases by 50 percent
C. It increases by a factor of 2
D. There is no adjustment allowed for lower duty cycle
C. It increases by a factor of 2
