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| Q. |
The quality of petrol is expressed in terms of – |
| A. | Cetane number |
| B. | Gold number |
| C. | Octane number |
| D. | Added unlead compounds |
| Answer» C. Octane number | |
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Explanation: Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine. |
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