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
D-slide valve
Meyer's expansion valve
Governor

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

The drive is recommended depending upon the torque transmitted
Both open belt drive and crossed belt drive is recommended
Crossed belt drive is recommended
Open belt drive is recommended

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