Theory of Machine
Which of the following disciplines provides study of relative motion between the parts of a machine?

Applied mechanics
Theory of machines
Mechanisms
Kinematics

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

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

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