Machine Design
The contact ratio is the ratio of

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

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

All of these
The effect of curvature of the cylinder wall is neglected
The tensile stresses are uniformly distributed over the section of the walls
The effect of the restraining action of the heads at the end of the pressure vessel is neglected

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Machine Design
In case of V belt drive

The belt should not touch the bottom of groove in the pulley
The belt should touch the bottom of groove in the pulley
The belt should not touch the sides of groove in the pulley
None of these

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