Q.

The rotor of 3-phase slip ring induction motor is fed from a 3-phase supply with its stator winding short circuited having rotor rotating clockwise at a speed of Nr, then the

A. speed of air gap field w.r.t. stator is ns-nr anticlockwise
B. speed of air gap field w.r.t. stator is ns-nr clockwise
C. speed of airgap field w.r.t rotor is ns clockwise
D. speed of airgap field w.r.t. stator is ns-nr clockwise
Answer» A. speed of air gap field w.r.t. stator is ns-nr anticlockwise
Explanation: the air gap field of stator = - (ns-nr).
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