Theory of Machine
Which one of the following can completely balance several masses revolving in different planes on a shaft?

Two equal masses in any two planes
Two masses in any two planes
A single mass in different planes
A single mass in one of the planes of the revolving masses

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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
No external force acts on a body, after giving it an initial displacement
None of these

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