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Calculate the De-rating factor if the string efficiency is 20 %.(a) .8(b) .4(c) .5(d) .6The question was posed to me in an interview.My question is taken from Solid-State Devices topic in section Introduction to Solid-State Devices of Electric Drives |
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Answer» RIGHT choice is (a) .8 To EXPLAIN: De-rating factor is used to MEASURE the reliability of a STRING. The value of the De-rating factor is 1-(string efficiency) = 1-.2 = .8. |
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