Electrical Troubleshooting Practice

Troubleshooting questions are different from simple recall questions. You need to decide what the evidence means and what to test next. This free mini-practice focuses on safe diagnostic reasoning for motors, control circuits, branch circuits, and drives.

A strong diagnostic process gathers evidence before reaching a conclusion: verify the symptom, check the supply and control circuit, use protective-device operation as evidence, compare measurements with expected values, and consider the connected load or mechanical condition.

• Use voltage and current measurements to narrow a motor or feeder fault.
• Separate control-circuit symptoms from power-circuit symptoms.
• Do not bypass protection to make a fault disappear.
• Connect drive faults with mechanical load, programmed acceleration, and measured current.
• Avoid replacing parts before the fault has been isolated.