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 clockwiseI have been asked this question in final exam.I want to ask this question from Induction Motor as a Transformer topic in section Induction Machines of Electrical Machines

The rotor of 3-phase slip ring induction motor is fed from a 3-phase s

1.	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 clockwiseI have been asked this question in final exam.I want to ask this question from Induction Motor as a Transformer topic in section Induction Machines of Electrical Machines
Answer» Correct option is (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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