Question

Which duty cycle has on load and off-loads period?

(a) Intermittent duty

(b) Short time duty

(c) Continuous duty with constant load

(d) Continuous duty with variable load

The question was posed to me during an interview.

This is a very interesting question from Motors Rating and Heating in portion Rating and Heating of Motors of Electric Drives

Answer 1

The correct option is (a) Intermittent duty

To explain: Intermittent duty cycle has frequent on load and off-loads period. The on-load period and off-loads periods are too short to achieve steady-state thermal condition.