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Calculate the heating time constant of the machine if the thermal capacity (c) of the machine is 24 watts/℃ and heat dissipation constant value (D) is 3 watts/℃.

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Calculate the heating time constant of the machine if the thermal capacity (c) of the machine is 24 watts/℃ and heat dissipation constant value (D) is 3 watts/℃.

(a) 8 sec

(b) 7 sec

(c) 6 sec

(d) 9 sec

This question was posed to me by my school principal while I was bunking the class.

I would like to ask this question from Motors topic in section Rating and Heating of Motors of Electric Drives

1 Answer

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Best answer
Correct choice is (a) 8 sec

Easiest 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=24÷3 = 8 sec.

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