Theory of Machine
The gear train usually employed in clocks is a

Sun and planet gear
Simple gear train
Reverted gear train
Differential gear

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Theory of Machine
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

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

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