Machine Design
Auto frettage is the method of

Pre-stressing thick cylinders
Joining thick cylinders
Calculating stresses in thick cylinders
Increasing the life of thick cylinders

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Machine Design
Pitch point of a cam is

A point on the pitch curve having minimum pressure angle
A point on the pitch curve having maximum pressure angle
Any point on the pitch curve
Any point on the pitch circle

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Machine Design
The contact ratio is the ratio of

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

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