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

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

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Theory of Machine
Which of the following is false statement in respect of differences between machine and structure?

Machines transmit mechanical work, whereas structures transmit forces
Machines modify movement and work, whereas structures modify forces
Efficiency of machines as well as structures is below 100 %
In machines, relative motion exists between its members, whereas same does not exist in case of structures

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Theory of Machine
Angle of descent of cam is defined as the angle

During which the follower returns to its initial position
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
Through which the cam rotates during the period in which the follower remains in the highest position

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