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What does the inability of the motor to dissipate the heat cause?

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in Design of Electrical Machines by (687k points)
What does the inability of the motor to dissipate the heat cause?

(a) causes high starting current

(b) insulation failure

(c) causes low starting current

(d) causes high starting current

I got this question during an interview for a job.

My question is from Design Steps and Considerations topic in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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Right option is (b) insulation failure

Explanation: The inability of the motor to dissipate the heat is one of the causes of thermal failure. The inability of the motor to dissipate heat causes insulation failure.

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