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Calculate mark to space ratio if the system is on for 17 sec and time period is 30 sec.

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in Electric Drives by (99.8k points)
Calculate mark to space ratio if the system is on for 17 sec and time period is 30 sec.

(a) 1.307

(b) 1.457

(c) 1.478

(d) 1.146

This question was addressed to me in an online interview.

This intriguing question originated from Modified Speed Torque Characteristics of DC Shunt Motors topic in chapter Characteristics of DC & AC Motors of Electric Drives

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Right option is (a) 1.307

For explanation I would say: 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=17÷(30-17) = 1.307.

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