Theory of Machine
The method of direct and reverse cranks is used in engines for

Kinematic analysis
The control of speed fluctuations
Balancing of forces and couples
Vibration analysis

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

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

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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

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

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