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1800 second rated motors are used for __________

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1800 second rated motors are used for __________

(a) Heavy duty cranes

(b) Light duty cranes

(c) Medium duty cranes

(d) Intermittent duty cranes

I got this question during an online interview.

This key question is from Motors Rating and Heating in section Rating and Heating of Motors of Electric Drives

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Correct answer is (c) Medium duty cranes

To explain: Medium duty crane motor is used to develop high starting torque. They provide the output for a specified interval of time without exceeding a specified temperature.

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