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

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

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Theory of Machine
The steering of a ship means

None of these
Turning of a complete ship in a curve towards right or left, while it moves forward
Rolling of a complete ship sideways
Movement of a complete ship up and down in vertical plane about transverse axis

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