Theory of Machine
Two systems shall be dynamically equivalent when

G. of two coincides
The mass of two are same
M.I. of two about an axis through e.g. is equal
All of these

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
Both (A) and (B)
None of these
The algebraic sum of the secondary forces must be equal to zero

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