a) state four methods of varying the speed of a three phase induction
b) A three phase induction motor has four pole star, connected star winding and runs on 220V, 5oHz supply. The motor rotor resistance per phase is 0.1ohms and reactance 0.9ohms the full load slip id 5%, calculate the load torque and starting Torque.
c) Explain the term armature reaction
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