M

Mr. Dubey • 52.30K Points
Coach 

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
Correct : Option (A)

Explanation: 
 the air gap field of stator = - (ns-nr).

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