Question

Distinguish between octane number and cetane number.

Answer 1

• Octane Number:

1. Octane rating is used for petrol
2. It measures the amount of octane present in petrol
3. Octane's number of petrol can be increased by adding benzene or toluene.
4. The fuel with high octane number has a low cetane number

• Cetane Number:

1. Cetane rating is used for diesel
2. It measures the ignition delay of the fuel in a diesel engine.
3. The cetane number of diesel can be increased by adding acetone.
4. The fuel with a high cetane number has a low octane number