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What is heating time constant of the machine?

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What is heating time constant of the machine?

(a) The ratio of the thermal capacity and heat dissipation constant value

(b) The ratio of the thermal capacity and heat dissipation constant value

(c) The ratio of the thermal capacity and heat dissipation constant value

(d) The ratio of the thermal capacity and heat dissipation constant value

I got this question in an interview for job.

Enquiry is from Motors in portion Rating and Heating of Motors of Electric Drives

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Correct choice is (a) The ratio of the thermal capacity and heat dissipation constant value

Easy explanation: The heating time constant of the machine is the ratio of the thermal capacity of the machine and heat dissipation constant value. Τ = c÷D. It has a unit of second.

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