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The short circuit test on a 3-φ induction motor is conducted at a rotor speed of _______

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The short circuit test on a 3-φ induction motor is conducted at a rotor speed of _______

(a) Zero

(b) < Ns

(c) > Ns

(d) Ns

This question was addressed to me in a national level competition.

Enquiry is from Speed Control of Shunt or Separately Excited Motors in chapter Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Right answer is (a) Zero

Explanation: Short-circuit test in an induction motor is also called a Blocked rotor test so it is conducted at zero speed. Net input power taken is equal to the variable losses.

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