HAM Radio Exam 2025-Questions with 100%
Correct Answers
T0A01
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 the battery
D. All of these choices are correct - ✔✔B
T0A02
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 of these choices are correct - ✔✔D
T0A03
In the United States, what is connected to the green wire in a threewire electrical AC plug?
A. Neutral
B. Hot
C. Equipment 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 feed line?
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. Mount all of the protectors on a metal plate that is in turn connected to an external ground
rod - ✔✔D
,T0A08
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 parallel with the AC power source
D. A capacitor in series with the AC power source - ✔✔A
T0A09
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
T0A10
What can happen if a lead-acid storage battery is charged or discharged too quickly?
A. The battery could overheat, 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
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 the charge stored in large capacitors - ✔✔D
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 carefully inspected climbing harness(fall arrester)and safety glasses
D. All of 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?
Correct Answers
T0A01
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 the battery
D. All of these choices are correct - ✔✔B
T0A02
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 of these choices are correct - ✔✔D
T0A03
In the United States, what is connected to the green wire in a threewire electrical AC plug?
A. Neutral
B. Hot
C. Equipment 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 feed line?
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. Mount all of the protectors on a metal plate that is in turn connected to an external ground
rod - ✔✔D
,T0A08
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 parallel with the AC power source
D. A capacitor in series with the AC power source - ✔✔A
T0A09
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
T0A10
What can happen if a lead-acid storage battery is charged or discharged too quickly?
A. The battery could overheat, 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
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 the charge stored in large capacitors - ✔✔D
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 carefully inspected climbing harness(fall arrester)and safety glasses
D. All of 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?
