General class license question pool with answers

T0A01 (B)

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

T0A02 (D)

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

T0A03 (B)

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

T0A04 (B)

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

T0A05 (C)

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

T0A06 (D)

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

T0A07 (D)

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

T0A08 (A)

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

T0A09 (C)

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

T0A10 (A)

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

T0A11 (D)

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

T0A12 (B)

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