Theory of Machine
In a radial cam, the follower moves

In any direction irrespective of the cam axis
In a direction perpendicular to the cam axis
In a direction parallel to the cam axis
Along the cam axis

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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

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

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