Theory of Machine
In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, this method will

Reduce length of effective stroke of piston
Cause withdrawing or throttling of steam
Reduce maximum opening of port to steam
All of the listed here

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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
The algebraic sum of the primary forces must be equal to zero
Both (A) and (B)
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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