Theory of Machine
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Second's pendulum
Torsional pendulum
Compound pendulum
Simple pendulum

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Theory of Machine
The steering of a ship means

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
None of these
Rolling of a complete ship sideways

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Theory of Machine
Crowning on pulleys helps

Increase belt and pulley life
For automatic adjustment of belt position so that belt runs centrally
In increasing velocity ratio
In decreasing the slip of the belt

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