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) 36This 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

25 V rated n SCRs are connected in series. The operation voltage of th

1.	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) 36This 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
Answer» 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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