Internal Combustion Engines
The brake power of a diesel engine, keeping other parameters constant, can be increased by

Increasing the pressure of intake air
Increasing the temperature of intake air
Decreasing the pressure of intake air
Decreasing the density of intake air

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Internal Combustion Engines
A hydraulic ram is a device used to

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
Store the energy of water
Increase the pressure of water

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

Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at 30° before bottom dead centre and closes at 10° after top dead centre
May open and close anywhere
Opens at bottom dead centre and closes at top dead centre

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