Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Higher pair
Self-closed pair
Force-closed pair
Lower pair

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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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Theory of Machine
In a four bar chain or quadric cycle chain

Each of the four pairs is a turning pair
Two are turning pairs and two are sliding pairs
One is a turning pair and three are sliding pairs
Three are turning pairs and one is a sliding pair

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