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The no-load circuit test on a 3-Φ induction motor is conducted at a rotor speed of _______

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The no-load circuit test on a 3-Φ induction motor is conducted at a rotor speed of _______

(a) Zero

(b) < Ns

(c) > Ns

(d) Ns

I had been asked this question by my college director while I was bunking the class.

My doubt stems from Induction Motors Speed Control in section Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Correct choice is (d) Ns

The explanation is: No-load circuit test in an induction motor is also called an open circuit test so it is conducted at synchronous speed. Net input power taken is equal to the no-load rotational losses.

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