Theory of Machine
Length of arc of contact is given by

Arc of approach × Arc of recess
Arc of approach + Arc of recess
Arc of approach - Arc of recess
Arc of approach / Arc of recess

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Theory of Machine
A body is said to be under forced vibrations, when

No external force acts on a body, after giving it an initial displacement
None of these
There is a reduction in amplitude after every cycle of vibration
A body vibrates under the influence of external force

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Theory of Machine
The steering of a ship means

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

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