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A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. How a three phase induction motor operates when rotor frequency is less than stator frequency?

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A three phase induction motor is sometimes called a generalized transformer in so far as voltage and frequency transformation has been concerned. How a three phase induction motor operates when rotor frequency is less than stator frequency?

(a) It operates as induction motor

(b) Emf is induced in rotor

(c) Rmf will rotate at synchronous speed

(d) All of the mentioned

I had been asked this question in my homework.

My doubt stems from Principle of Operation in chapter Induction Machines of Electrical Machines

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The correct choice is (d) All of the mentioned

To elaborate: It will operate as induction motor.

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