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Calculate the De-rating factor if the string efficiency is 5 %.

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Calculate the De-rating factor if the string efficiency is 5 %.

(a) .95

(b) .55

(c) .65

(d) .85

The question was posed to me during an online interview.

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Correct option is (a) .95

For explanation I would say: De-rating factor is used to measure the reliability of a string. The value of the De-rating factor is 1-(string efficiency)=1-.05=.95.

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