Theory of Machine
The danger of breakage and vibration is maximum

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

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Theory of Machine
Higher pairs are those which have

Point or line contact between the two elements when in motion
Surface contact between the two elements when in motion
Two elements that permit relative motion
Elements of pairs not held together mechanically

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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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