Industrial Maintenance Technician Practice Test 2025 - Free Maintenance Technician Practice Questions and Study Guide

To determine why the selection of checking the breaker, light bulb, and then the switch is the correct approach for a non-working ceiling light fixture, it's important to understand the logical flow of troubleshooting electrical issues.

Starting with the breaker is crucial because it ensures that power is being supplied to the fixture. If the circuit breaker has tripped, all subsequent checks are irrelevant since there would be no power reaching the ceiling light fixture. By resetting the breaker first, you immediately assess if power is the issue.

Once you've confirmed that the breaker is functioning properly, the next step involves checking the light bulb. This is a common failure point, as bulbs can burn out over time. A simple visual inspection or a quick replacement with a known good bulb can confirm whether the light socket is receiving power.

Finally, checking the switch ensures that it's functioning correctly. If the switch is faulty (for example, it may have internal wear or damage), it could prevent the fixture from being operational, even if the breaker and bulb are fine.

By following this order—confirming the power source first, then examining the load, and lastly verifying control—technicians can efficiently identify and resolve the issue with the ceiling light fixture.