Internal Combustion Engines
Detonation is harmful due to

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

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Internal Combustion Engines
A hydraulic ram is a device used to

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

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