Theory of Machine
The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at

The point of contact
An infinite distance on the plane surface
The point on the circumference situated vertically opposite to the contact point
The center of the disc

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Theory of Machine
Effort of a governor is the

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

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