Find the slip speed of motor

Q.  Slip speed of the motor decides the magnitude of the induced emf and the rotor current, which in turn decides the torque produced. If Ns is the synchronous speed and N is the motor speed in rpm, then the slip speed is given by
- Published on 23 Oct 15

a. Ns
b. Ns – N
c. Ns + N
d. N - Ns

ANSWER: Ns – N

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