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Approximately the efficiency of the rotor of the induction motor depends on the _________

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Approximately the efficiency of the rotor of the induction motor depends on the _________

(a) rotor speed

(b) synchronous speed

(c) rotor speed and synchronous speed

(d) magnetic field speed

The question was posed to me during a job interview.

This intriguing question originated from Induction Motor Phasor Diagram in section Induction Machines of Electrical Machines

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Best answer
The correct option is (c) rotor speed and synchronous speed

Best explanation: Efficiency of the rotor is approximately equal to ratio of speed of rotor to synchronous speed.

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