Question: 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 _________
Options
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
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