Oilers/Plant Tenders (HHC) Civil Service Practice Exam

What occurs in electric motors that do not have a lubrication system?

1. Bearings must be replaced regularly

2. They operate at higher temperatures

3. They must be disassembled for periodic maintenance

4. They automatically lubricate themselves

The correct answer is: They must be disassembled for periodic maintenance

The most accurate answer reflects that electric motors without a lubrication system require disassembly for periodic maintenance. In these motors, the absence of an effective lubrication mechanism leads to wear and tear on the internal components, particularly the bearings. Without lubrication, friction increases, which can cause parts to overheat and wear out more quickly. Disassembling the motor allows for inspection, cleaning, and the manual application of lubrication to ensure its functioning is maintained and to prevent premature failure. Regular replacement of bearings is indeed necessary in motors lacking lubrication systems, but this action is not adequate alone for maintenance; regular disassembly and inspection are needed to avoid complete failure. While it's true that motors operate at higher temperatures due to increased friction, this result is more of a symptom rather than a separate occurrence tied to the lubrication absence. The notion that a motor would automatically lubricate itself is inaccurate for those without a designated system designed for such a purpose. Therefore, the answer regarding the need for periodic disassembly and maintenance captures the essence of the challenges faced by electric motors lacking lubrication.