Q2. a) Explain the construction and working principle of three-phase induction motor used on ships. How is the direction of rotation of the motor reversed? (8)
b) Discuss the maintenance procedures for an electric propulsion motor on a ship. What common faults can occur in the motor, and how would you diagnose and repair them? (8)
Q5. a) What is single phasing of a 3 ph induction motor? (6)
b) What are the causes of single phasing? (6)
c) Explain any method of protection against single phasing? (4)
Q1. (a) Compare methods of obtaining speed regulation of three-phase induction motor generally used in tankers by means of: (16) i. Rotor resistance. ii. Cascade system. iii. Pole-changing.
Give examples where each system may be employed with advantage.
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