Theory of Machine
A spring controlled governor is found unstable. It can be made stable by

Decreasing the spring stiffness
Increasing the spring stiffness
Decreasing the ball mass
Increasing the ball mass

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
The Ackerman steering gear is most economical
Both (A) and (B)
The Ackerman steering gear consists of turning pairs

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