Theory of Machine
Open pairs are those which have

Elements of pairs not held together mechanically
Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion
Two elements that permit relative motion

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Theory of Machine
The steering of a ship means

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

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