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

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

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Theory of Machine
Lower pairs are those which have

Two elements that permit relative motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically
Surface contact between the two elements when in motion

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