Question

Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The maximum value occurs in the region of ____________

(a) lean mixture

(b) chemically correct mixture

(c) rich mixture

(d) none of the mentioned

The question was asked during a job interview.

I'd like to ask this question from Air Fuel Mixtures topic in chapter Carburetion of IC Engine

Answer 1

Correct answer is (b) chemically correct mixture

For explanation I would say: The maximum value occurs in the region of chemically correct mixture.