Machine Design
The contact ratio is the ratio of

Length of arc of recess to the circular pitch
Length of arc of contact to the circular pitch
Length of path of contact to the circular pitch
Length of arc of approach to the circular pitch

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Machine Design
Which is correct statement?

A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Both will be equally rigid
Which one is rigid will depend on several other factors

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