Theory of Machine
Governor is used in automobile to

Limit the vehicle speed
Maintain constant engine speed
Decrease the variation of speed
Maximize the fuel economy

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

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

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