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Calculate the value of the short circuit ratio if Voc=78 V, Isc=15 A with field current = 5 A.

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Calculate the value of the short circuit ratio if Voc=78 V, Isc=15 A with field current = 5 A.

(a) 5.2

(b) 4.8

(c) 3.2

(d) 1.8

I had been asked this question by my college director while I was bunking the class.

Query is from Induction Motors topic in chapter Speed Control of Direct Current Motors & Induction Motors of Electric Drives

1 Answer

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Correct option is (a) 5.2

Easiest explanation: The value of the short circuit ratio is the ratio of open circuit voltage to the short circuit current with same field current. SCR=Voc÷Isc=78÷15=5.2.

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