Theory of Machine
When the axes of the first and last wheels are coaxial, then the train is known as

Reverted gear train
Simple train of wheels
Compound train of wheels
Epicyclic gear train

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

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
Resultant couple is equal to zero

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