The induced emf of a dc machine running at 750 rpm is 220 V. The perce – McqOptions

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1.	The induced emf of a dc machine running at 750 rpm is 220 V. The percentage increase in field flux for generating an induced emf of 250 V at 700 rpm would be:
A.	7%
B.	11.25%
C.	21.7%
D.	42.4%
Answer» D. 42.4%

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