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1 某分激式直流電動機之無載轉速1300rpm,已知其速率調整率為5%,則滿載轉速約為多少rpm?
A 1220rpm
B 1238rpm
C 1254rpm
D 1267rpm

速率調整率S.R.%= n0-nfnf×100%

(1300-nf)/nf=5%

1300-nf=0.05nf

nf = 1300/1.05

nf= 1238 rpm