Question

What can we say about the air-fuel mixture if the engine is stalling by itself?

(a) The extra weak mixture is supplied

(b) An extra rich mixture is supplied

(c) Combustion in muffler

(d) The color of the exhaust smoke is black

The question was asked in semester exam.

My question is from Petrol Engine Fuel Supply System in division Petrol Engine Fuel Supply System of Automotive Engine Design

Answer 1

Right choice is (a) The extra weak mixture is supplied

Best explanation: When the engine is supplied with the extra weak mixture the stalling of the engine by itself is the indication when the extra weak mixture is supplied. Whereas combustion in the muffler and black exhaust smoke represents an extra rich mixture.