Theory of Machine
The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as

Machine
Compound mechanism
Inversion
Structure

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Theory of Machine
Higher pairs are those which have

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

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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
All of the listed here
Cause withdrawing or throttling of steam
Reduce length of effective stroke of piston

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