WALMART MAINTENANCE Electrical Systems 3

Question 1

What does GFCI stand for in electrical safety?

Accepted Answer

Ground Fault Circuit Interrupter

Answer

GFCI stands for Ground Fault Circuit Interrupter, a device that protects against electrical shock by detecting ground faults.

Question 2

In a 3-phase electrical system used in large retail facilities, what is the phase angle between each phase?

Accepted Answer

120 degrees

Answer

In a 3-phase system, each phase is separated by 120 degrees, providing balanced power distribution.

Question 3

When checking a motor's insulation resistance with a megohmmeter, what reading generally indicates acceptable insulation?

Accepted Answer

At least 1 megohm

Answer

Acceptable motor insulation resistance is typically at least 1 megohm, with higher values indicating better insulation condition.

Question 4

What color is the grounding conductor in standard US electrical wiring?

Accepted Answer

Green or bare copper

Answer

The grounding conductor in US wiring is green or bare copper, distinguishing it from neutral (white) and hot (black/red) conductors.

Question 5

Which device is used to measure electrical current without breaking the circuit?

Accepted Answer

Clamp meter

Answer

A clamp meter measures current by clamping around a conductor, using the magnetic field to calculate amperage without breaking the circuit.

WALMART MAINTENANCE Practice Test