IBEW IBEW Aptitude Test Electrical Fundamentals Questions and Answers 2

Question 1

What color is the neutral wire in a standard US household electrical circuit?

Accepted Answer

White

Answer

In US residential wiring, the white wire is neutral, black is hot, and green or bare copper is the ground.

Question 2

A GFCI outlet is designed primarily to protect against:

Accepted Answer

Ground faults

Answer

A Ground Fault Circuit Interrupter (GFCI) detects small ground fault currents and trips within milliseconds to prevent electrocution.

Question 3

What does AWG stand for in electrical wiring?

Accepted Answer

American Wire Gauge

Answer

American Wire Gauge (AWG) is the standardized system used in the US to indicate the diameter and current-carrying capacity of wire.

Question 4

In a parallel circuit with two 10Ω resistors, what is the total resistance?

Accepted Answer

5Ω

Answer

For two equal resistors in parallel, total resistance = R/2, so 10Ω ÷ 2 = 5Ω.

Question 5

The standard single-phase outlet voltage in a US residential building is:

Accepted Answer

120V

Answer

Standard US residential outlets supply 120V at 60Hz, provided by a single hot wire and a neutral wire.

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