Theory of Machine
The example of spherical pair is

Ball bearing and roller bearing
Bolt and nut
Lead screw of a lathe
Ball and socket joint

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Theory of Machine
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

Cause withdrawing or throttling of steam
All of these
Reduce length of effective stroke of piston
Reduce maximum opening of port to steam

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