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

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

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Theory of Machine
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

Because of difficulty in manufacturing cam profile
In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
Because of loose contact of follower with cam surface
Because the uniform velocity motion is a partial parabolic motion

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