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Slip is defined as _________ (Ns as the synchronous speed and Nr is the rotor speed)

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Slip is defined as _________ (Ns as the synchronous speed and Nr is the rotor speed)

(a) Ns-Nr/Ns

(b) Ns-Nr/Nr

(c) Nr-Ns/Ns

(d) Ns-Nr

The question was asked during a job interview.

Origin of the question is Rotor Frequency topic in division Induction Machines of Electrical Machines

1 Answer

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Best answer
Right choice is (a) Ns-Nr/Ns

Best explanation: Slip is the ratio of the relative speed of between the stator mmf and the rotor speed to the synchronous speed of the machine.

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