Internal Combustion Engines
Pour point of fuel oil is the

Temperature at which it solidifies or congeals
It catches fire without external aid
Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

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

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Internal Combustion Engines
For the same compression ratio

Otto cycle is more efficient than the Diesel
Compression ratio has nothing to do with efficiency
Diesel cycle is more efficient than Otto
Both Otto and Diesel cycles are, equally efficient

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