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Class 4 (4th Engineer) MET 📅 Jul 2022

Exam Question

(a) Describe how you would overhaul an electric motor that has been flooded with sea water (5)

(b) Explain how to check the insulation resistance of the motor, stating the minimum acceptable value (6)

(c) Principle of rotation of rotor and how to reverse the direction of a three-phase induction motor (5)

Reference Answer

### (a) Overhaul of an Electric Motor Flooded with Seawater
A systematic procedure must be followed to restore a seawater-flooded motor to a safe and operational condition. The primary goals are to remove all conductive and corrosive salt deposits, thoroughly dry the insulation, and verify its integrity.
**1. Safety and Isolation:**
* **Permit to Work (PTW):** A PTW must be issued and a comprehensive risk assessment conducted.

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