Q2. 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)
Q5. With reference to three phase induction motors:
a) Explain the phenomenon of crawling and cogging in these motors. (6)
b) The output of an induction motor running at 4% slip is 36.775 kW and the friction and windage losses are 1500W. find the rotor copper loss and motor efficiency if stator losses are 3kW. (10)
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