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Calculate the heating time constant of the machine if the thermal capacity (c) of the machine is 16 watts/℃ and heat dissipation constant value (D) is 4 watts/℃.

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Calculate the heating time constant of the machine if the thermal capacity (c) of the machine is 16 watts/℃ and heat dissipation constant value (D) is 4 watts/℃.

(a) 6 sec

(b) 7 sec

(c) 4 sec

(d) 9 sec

This question was posed to me during an interview for a job.

Origin of the question is Motors Rating and Heating topic in chapter Rating and Heating of Motors of Electric Drives

1 Answer

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Best answer
Correct option is (c) 4 sec

Best 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 = 16÷4 = 4 sec.

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