Theory of Machine
To obviate axial thrust, following gear drive is used

Mutter gears
Double helical gears having identical teeth
Single helical gear in which one of the teeth of helix angle a is more
Double helical gears having opposite teeth

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Theory of Machine
The steering of a ship means

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

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