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Calculate the string efficiency if the de-rating factor is .50.

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Calculate the string efficiency if the de-rating factor is .50.

(a) 28 %

(b) 42 %

(c) 80 %

(d) 50 %

The question was asked in final exam.

I want to ask this question from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives

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Correct answer is (d) 50 %

Explanation: The string efficiency is calculated for series and parallel connection of SCRs. The value of string efficiency is 1-(De-rating factor)=1-.50=50 %.

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