Question

How can we increase the octane rating of gasoline?

(a) By addition of fuel of low anti-knock value

(b) By addition of fuel of high anti-knock value

(c) By adding a product of high cetane rating

(d) By heating of the fuel

I had been asked this question in class test.

Question is from Anti Knocking Agents in chapter Fuels and Combustion of Engineering Chemistry II

Answer 1

Right option is (b) By addition of fuel of high anti-knock value

For explanation I would say: Compounds such as casing-head gasoline, cracked and reformed gasoline, benzol and alcohol are added to increase the octane rating of the fuel. The more will be the octane rating, the less will be the knocking in the engine.