Theory of Machine
When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a

Flywheel
Meyer's expansion valve
Governor
D-slide valve

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Theory of Machine
In a single slider crank chain

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

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