T0 – SAFETY – [3 Exam Questions - 3 Groups] Flashcards
“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