Elevator Mechanic Practice Exam

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Prepare for the Elevator Mechanic Exam with comprehensive quizzes, flashcards, and multiple-choice questions. Each question includes hints and detailed explanations to ensure you are ready for your exam!

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A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage or resistance. What should you do?

Check the circuit breaker
Replace it with a smaller MOV
Replace it with a larger MOV
Try another MOV of the same size

The correct answer is: Check the circuit breaker

The correct choice is to check the circuit breaker. When a Metal Oxide Varistor (MOV) burns out, it may be indicative of an over-voltage event that could have also affected other components in the circuit, including the circuit breaker. If the circuit breaker has tripped or is faulty, it will prevent the MOV from operating correctly, and until this is resolved, further troubleshooting will be ineffective. Properly checking the circuit breaker allows you to determine if the issue is related to a power interruption or if there are underlying issues that need addressing before proceeding with other repairs. This ensures a comprehensive approach to diagnosing the problem, rather than simply replacing components without verifying the circuit's overall integrity and functionality.