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400 V rated 5 SCRs are connected in series. The operation voltage of the string is 500. Calculate the string efficiency.

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400 V rated 5 SCRs are connected in series. The operation voltage of the string is 500. Calculate the string efficiency.

(a) 25 %

(b) 40 %

(c) 38 %

(d) 35 %

This question was posed to me during a job interview.

The origin of the question is Solid-State Devices in section Introduction to Solid-State Devices of Electric Drives

1 Answer

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Best answer
Right choice is (a) 25 %

Best explanation: The string efficiency can be calculated using the formula operation voltage÷(Number of SCRs×Rated voltage) = 500÷(400×5) = 25 %.

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