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.
Q2. Tank liquid level sensors are an integral part of ships. Describe with the aid of suitable sketches the working principle of: (a) Capacitive type level sensor (6) (b) Ultrasonic level sensor (5) (c) Float (5)
Q3. With reference to squirrel cage, induction, electric motors:
A. Describe the construction of such a motor. (6)
B. Sketch the torque against speed curve of such a motor. (5)
C. Describe a method employed by a retrofitted device used to improve the part load performance of an induction motor. (5)
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