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

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

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Theory of Machine
Which is the false statement about the properties of instantaneous center?

The two rigid links have no linear velocities relative to each other at the instantaneous center
The double center can be denoted either by O2 or O12, but proper selection should be made
The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

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Theory of Machine
Effort of a governor is the

None of these
Mean force exerted at the sleeve for a given percentage change of speed
Work-done at the sleeve for maximum equilibrium speed
Mean force exerted at the sleeve for maximum equilibrium speed

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