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1 如圖所示a、b、c、d四皮帶輪,Da=150mm,Db=450mm,Dc=200mm,Dd=600mm,若不計滑動損失,則Na以1400rpm原動時,Nd=
A 156rpm
B 256rpm
C 356rpm
D 456rpm

Nb=1400×150/450=1400/3

b、c 同軸,轉速相同 Nc = Nb

Nd=1400/3×200/600=1400/9≒156rpm