Theory of Machine
The danger of breakage and vibration is maximum

Above the critical speed
None of these
Below the critical speed
Near the critical speed

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Theory of Machine
The contact ratio is given by

(Length of the arc of approach)/cosφ
(Length of the arc of contact)/(Circular pitch)
(Length of path of recess)/(Circular pitch)
(Length of the path of approach)/(Circular pitch)

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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
Cause withdrawing or throttling of steam
Reduce maximum opening of port to steam
Reduce length of effective stroke of piston

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