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Calculate mark to space ratio if the system is on for 4 sec and off time is 9 sec.

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Calculate mark to space ratio if the system is on for 4 sec and off time is 9 sec.

(a) .54

(b) .44

(c) .45

(d) .46

This question was posed to me by my college professor while I was bunking the class.

My enquiry is from Solid State Controlled Drives in division Introduction to Solid State Controlled Drives of Electric Drives

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The correct option is (b) .44

Explanation: Mark to space 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 = 4÷(9) = .44.

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