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General Class Exam Question Pool

effective 7/01/2015 thru 6/30/2019

    Unseen questions
    Weak questions
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    Incorrect answer choices  

2015-G0B: Safety in the ham shack: electrical shock and treatment, safety grounding, fusing, interlocks, wiring, antenna and tower safety

2015-G0B01: Which wire or wires in a four-conductor connection should be attached to fuses or circuit breakers in a device operated from a 240 VAC single phase source?

Only the two wires carrying voltage

Only the neutral wire

Only the ground wire

All wires

2015-G0B02: What is the minimum wire size that may be safely used for a circuit that draws up to 20 amperes of continuous current?

AWG number 12

AWG number 20

AWG number 16

AWG number 8

2015-G0B03: Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?

15 amperes

100 amperes

60 amperes

30 amperes

2015-G0B04: Which of the following is a primary reason for not placing a gasoline-fueled generator inside an occupied area?

Danger of carbon monoxide poisoning

Danger of engine over torque

Lack of oxygen for adequate combustion

Lack of nitrogen for adequate combustion

2015-G0B05: Which of the following conditions will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a device?

Current flowing from one or more of the voltage-carrying wires directly to ground

Current flowing from one or more of the voltage-carrying wires to the neutral wire

Overvoltage on the voltage-carrying wires

All of these choices are correct

2015-G0B06: Why must the metal enclosure of every item of station equipment be grounded?

It ensures that hazardous voltages cannot appear on the chassis

It prevents a blown fuse in the event of an internal short circuit

It prevents signal overload

It ensures that the neutral wire is grounded

2015-G0B07: Which of these choices should be observed when climbing a tower using a safety belt or harness?

Confirm that the belt is rated for the weight of the climber and that it is within its allowable service life

Never lean back and rely on the belt alone to support your weight

Ensure that all heavy tools are securely fastened to the belt D-ring

All of these choices are correct

2015-G0B08: What should be done by any person preparing to climb a tower that supports electrically powered devices?

Make sure all circuits that supply power to the tower are locked out and tagged

Notify the electric company that a person will be working on the tower

Unground the base of the tower

All of these choices are correct

2015-G0B09: Why should soldered joints not be used with the wires that connect the base of a tower to a system of ground rods?

A soldered joint will likely be destroyed by the heat of a lightning strike

The resistance of solder is too high

Solder flux will prevent a low conductivity connection

Solder has too high a dielectric constant to provide adequate lightning protection

2015-G0B10: Which of the following is a danger from lead-tin solder?

Lead can contaminate food if hands are not washed carefully after handling the solder

High voltages can cause lead-tin solder to disintegrate suddenly

Tin in the solder can "cold flow" causing shorts in the circuit

RF energy can convert the lead into a poisonous gas

2015-G0B11: Which of the following is good practice for lightning protection grounds?

They must be bonded together with all other grounds

They must be bonded to all buried water and gas lines

Bends in ground wires must be made as close as possible to a right angle

Lightning grounds must be connected to all ungrounded wiring

2015-G0B12: What is the purpose of a power supply interlock?

To ensure that dangerous voltages are removed if the cabinet is opened

To prevent unauthorized changes to the circuit that would void the manufacturer’s warranty

To shut down the unit if it becomes too hot

To shut off the power supply if too much voltage is produced

2015-G0B13: What must you do when powering your house from an emergency generator?

Disconnect the incoming utility power feed

Insure that the generator is not grounded

Insure that all lightning grounds are disconnected

All of these choices are correct

2015-G0B14: Which of the following is covered by the National Electrical Code?

Electrical safety inside the ham shack

Acceptable bandwidth limits

Acceptable modulation limits

RF exposure limits of the human body

2015-G0B15: Which of the following is true of an emergency generator installation?

The generator should be located in a well-ventilated area

The generator must be insulated from ground

Fuel should be stored near the generator for rapid refueling in case of an emergency

All of these choices are correct

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Previous group:
2015-G0A: RF safety principles, rules and guidelines; routine station evaluation
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