Internal Combustion Engines
A hydraulic ram is a device used to

Store the energy of water
Increase the pressure of water
To lift water from deep wells
To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height

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Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

May start and end anywhere
Starts at 40° before top dead center and ends at 40° after top dead center
Starts at 40° after bottom dead center and ends at 10° before top dead center
Starts at top dead center and ends at 40° before bottom dead center

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