Class 2 (2nd Engineer) MEP 📅 Feb 2018

Exam Question

What are the routine maintenance carried out to an A.C. motor and

(a) Explain the meaning of single phasing in A.C. machinery.

(b) State the dangers associated with single phasing and enumerate the protective devices normally fitted to counteract such dangers.

Reference Answer

Routine Maintenance of an AC Motor:
Thoroughly clean the motor's interior and exterior surfaces, removing dirt, grease, and oil using dry air and cleaning solvents.
Maintain a uniform air gap between the stator and rotor as specified by the manufacturer. An uneven air gap can lead to vibration and premature wear.
Lubricate bearings according to the manufacturer's recommended schedule and using the specified lubricant type and quantity.

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