Q. Ignition quality of a petrol engine fuel is expressed in
Solution:
- Octane rating is the measure of a fuel’s ability to resist knocking, values above 87.
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Diesel fuel is rated by its Cetane number which is usually 40 to 50.
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API gravity is thus an inverse measure of a petroleum liquid’s specific gravity.
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It is used to compare densities of petroleum liquids.
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SAE number, code for specifying the viscosity of lubricating oil.
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