The mechanical power developed by a 3-phase induction motor running at 2% slip having 1000 W input is

(A) 30 W

(B) 950 W

(C) 500 W

(D) 970 W

Ans: (D) 970 W

Explanation: 

Mechanical power developed by motor

= (1-5) * Power input to rotor

= (1-0.03)*1000 = 970 W