The contact ratio is given by

1.	The contact ratio is given by
A.	(Length of the path of approach)/(Circular pitch)
B.	(Length of path of recess)/(Circular pitch)
C.	(Length of the arc of contact)/(Circular pitch)
D.	(Length of the arc of approach)/cosφ
Answer» D. (Length of the arc of approach)/cosφ

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The contact ratio is given by

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