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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What should be checked if a new MOV (Metal Oxide Varistor) burns out quickly?

Circuit breaker
Voltage rating of the MOV
Fuse rating
Insulation resistance

The correct answer is: Circuit breaker

The correct choice to focus on is the voltage rating of the MOV. If a new MOV burns out quickly, it is critical to assess whether the voltage rating of the MOV is appropriate for the application. MOVs are designed to protect circuits by clamping voltage spikes, but if the applied voltage exceeds their rated capacity, the MOV may fail prematurely. Understanding the voltage rating is essential because each MOV has a specific maximum voltage it can withstand. If the circuit experiences voltage surges or spikes that exceed this rating, it can lead to damage or complete failure of the MOV. This is particularly important in systems where voltage can fluctuate or in environments with potential electrical disturbances. The other factors, while important in their own right, do not address the immediate concern of MOV failure due to voltage problems. Checking the circuit breaker, fuse rating, and insulation resistance could provide valuable insight into the overall health of the electrical system, but they do not directly determine whether the MOV is being subjected to voltages that exceed its specifications.