Theory of Machine
A governor is said to be stable, if the

Radius of rotation of balls decreases as the equilibrium speed decreases
Radius of rotation of balls increases as the equilibrium speed increases
Radius of rotation of balls increases as the equilibrium speed decreases
Radius of rotation of balls decreases as the equilibrium speed increases

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Theory of Machine
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

Because of loose contact of follower with cam surface
In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
Because of difficulty in manufacturing cam profile
Because the uniform velocity motion is a partial parabolic motion

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Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

None of the listed here
Vary with the configuration of the mechanism
Moves as the mechanism moves, but joints are of permanent nature
Remain in the same place for all configurations of the mechanism

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