Internal Combustion Engines
By higher octane number of spark ignition fuel, it is meant that the fuel has

Higher flash point
Lower volatility
Higher heating value
Longer ignition delay

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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
Store the energy of water
To lift water from deep wells
Increase the pressure of water

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