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Calculate mark to space ratio if the system is on for 4.3 sec and off for 78.2 sec.

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in Electric Drives by (99.8k points)
Calculate mark to space ratio if the system is on for 4.3 sec and off for 78.2 sec.

(a) .054

(b) .047

(c) .039

(d) .018

The question was asked during an interview.

Question is from Induction Motors Speed Control in portion Speed Control of Direct Current Motors & Induction Motors of Electric Drives

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Right answer is (a) .054

The 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 = 4.3÷78.2 = .054.

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