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The starting method for a 3-phase squirrel-cage induction motor which is inferior in view of poor starting torque per ampere of line current drawn is?

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The starting method for a 3-phase squirrel-cage induction motor which is inferior in view of poor starting torque per ampere of line current drawn is?

(a) series-inductor method of starting

(b) direct-on-line starting

(c) auto-transformer method

(d) star-delta method

This question was posed to me at a job interview.

My question is taken from Principle of Operation in portion Induction Machines of Electrical Machines

1 Answer

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Right answer is (a) series-inductor method of starting

Easiest explanation: Due to inductor method, reactance increases and the starting torque decreases.

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