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)
Q1. a) Briefly explain the principle of operation of Induction Motors (4)
b) What is slip for an induction motor? (4)
c) Draw a simple ladder logic diagram of star delta starting of an induction motor. (8)
Q1. Direct online starting for large induction motors such as those for bow thrust units, may not be viable.
a) State the reasons for this. (5)
b) Sketch a starting system that may be used for such motors. (6)
c) Describe the starting method sketched in (a, b). (6)
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