Theory of Machine
Torsional vibrations are said to occur when the particles of a body moves

None of these
Parallel to its axis
Perpendicular to its axis
In a circle about its axis

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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
Angle of descent of cam is defined as the angle

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Of rotation of the cam for a definite displacement of the follower
During which the follower returns to its initial position
Through which the cam rotates during the period in which the follower remains in the highest position

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