Theory of Machine
Which of the following is an example of sliding pair?

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

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force and resultant couple are both equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force is equal to zero
Resultant couple is equal to zero

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