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25 V rated n SCRs are connected in series. The operation voltage of the string is 300 V and the string efficiency is 40 %. Calculate the value of n.

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25 V rated n SCRs are connected in series. The operation voltage of the string is 300 V and the string efficiency is 40 %. Calculate the value of n.

(a) 27

(b) 30

(c) 34

(d) 36

This question was posed to me in an online quiz.

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

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Correct choice is (b) 30

For explanation I would say: The string efficiency can be calculated using the formula operation voltage÷(Number of SCRs×Rated voltage). The value of n is 300÷(25×.4)=30.

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