Theory of Machine
Which of the following statement is correct for involute gears?

A convex flank is always in contact with concave flank.
The variation in centre distance of shafts increases radial force.
The pressure angle is constant throughout the teeth engagement.
The interference is inherently absent.

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Theory of Machine
Pitch point on a cam is

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

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