Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

Perpendicular to line as per (A)
At 45° to line as per (A)
Not possible to determine with these data
Joining the corresponding points

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Theory of Machine
Angle of descent of cam is defined as the angle

Of rotation of the cam for a definite displacement of the follower
Through which the cam rotates during the period in which the follower remains in the highest position
Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
During which the follower returns to its initial position

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

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

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