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If one of the phases of the supply breaks down, then the connected three phase induction motor _________

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If one of the phases of the supply breaks down, then the connected three phase induction motor _________

(a) continues to run as a single phase induction motor, provided load does does not increase beyond 57.7%

(b) stops operating after few seconds

(c) continues to run as single phase induction motor

(d) continues to run as two phase induction motor

I had been asked this question in a job interview.

The above asked question is from Losses and Efficiency topic in portion Rating and Loss Dissipation of Electrical Machines

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Correct answer is (a) continues to run as a single phase induction motor, provided load does does not increase beyond 57.7%

Easy explanation: When one of the phases breaks down then the other two phases will supply the rated current but the load should be reduced to 57.7%.

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