Theory of Machine
Which of the following is a turning pair?

Piston and cylinder of a reciprocating steam engine
Lead screw of a lathe with nut
Ball and a socket joint
Shaft with collars at both ends fitted into a circular hole

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Theory of Machine
Crowning on pulleys helps

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

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