A pair of spur gears with module 5 mm and a center distance of 450 mm is used for a speed reduction of 5 : 1. The number of teeth on pinion is ______ .

A pair of spur gears with module 5 mm and a center distance of 450 mm

1.	A pair of spur gears with module 5 mm and a center distance of 450 mm is used for a speed reduction of 5 : 1. The number of teeth on pinion is ______ .
A.	32
B.	30
C.	31.5
D.	32.4
Answer» C. 31.5

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A pair of spur gears with module 5 mm and a center distance of 450 mm is used for a speed reduction of 5 : 1. The number of teeth on pinion is ______ .

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