Theory of Machine
The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as

Structure
Machine
Compound mechanism
Inversion

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Theory of Machine
A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant couple is equal to zero
Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Resultant force is equal to zero
Resultant force and resultant couple are both equal to zero

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