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) 5.6This 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

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

1.	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) 5.6This 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
Answer» 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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