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Calculate mark to space ratio if the system is on for 9 sec and time period is 11 sec.

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in Electric Drives by (99.6k points)
Calculate mark to space ratio if the system is on for 9 sec and time period is 11 sec.

(a) 4.6

(b) 4.8

(c) 4.5

(d) 4.9

This question was posed to me during an online interview.

Question is taken from Energy Relations During Starting topic in section Starting of Electric Drives

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The correct answer is (c) 4.5

Easiest 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=9÷(11-9) = 4.5.

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