Theory of Machine
Which of the following is an example of a higher pair?

Ball and roller bearing
All of the listed here
Toothed gearing
Belt and rope drive

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

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Moved by the cam from beginning of ascent to the termination of descent
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

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