Internal Combustion Engines
A hydraulic ram is a device used to

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

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Internal Combustion Engines
Detonation is harmful due to

Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
None of these
High intensity of knock causes crankshaft vibration and the engine runs rough
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine

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