Theory of Machine
The example of lower pair is

All of these
Straight line motion mechanisms
Shaft revolving in a bearing
Automobile steering gear

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Theory of Machine
Cam angle is defined as the angle

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

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Theory of Machine
Oldham's coupling is the

Third inversion of double slider crank chain
Second inversion of single slider crank chain
Second inversion of double slider crank chain
Third inversion of slider crank chain

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Theory of Machine
Crowning on pulleys helps

For automatic adjustment of belt position so that belt runs centrally
In decreasing the slip of the belt
In increasing velocity ratio
Increase belt and pulley life

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