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Calculate mark to space ratio if the system is on for 20 sec and off for 3 sec.

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Calculate mark to space ratio if the system is on for 20 sec and off for 3 sec.

(a) 6.66

(b) 4.48

(c) 8.2

(d) 5.6

This question was addressed to me during a job interview.

Asked question is from Power Rating Determination of Electric Motors for Different Applications topic in division Rating and Heating of Motors of Electric Drives

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The correct choice is (a) 6.66

Explanation: Mark to space ratio is Ton÷Toff. It is the ratio of time for which the system is active and the time for which is inactive. M = Ton÷Toff=20÷3=6.66.

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