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Class 4 (4th Engineer) MET 📅 Sep 2025

Exam Question

(a) Explain the term single phasing as applied to poly phase induction motors. (4)

(b) State the likely causes of single phasing and the consequences if motors are not adequately protected. (4)

(c) Describe with the aid of sketches THREE methods for motor protection should single phasing occur. (8)

Reference Answer

### (a) Explanation of Single Phasing (4 Marks)
**1. Definition:**
Single phasing is a fault condition in a polyphase (typically three-phase) electrical system where one of the supply lines to an induction motor is opened or disconnected. The motor, therefore, receives power from only two of the three phases.
**2. Principle of Operation (Normal vs. Single Phasing):**

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