Question

During which of the following the mixture tends to become richer in a single jet carburetor?

(a) During winter

(b) At low altitude

(c) At high altitude

(d) During idling

This question was addressed to me in an internship interview.

Origin of the question is Petrol Engine Fuel Supply System topic in chapter Petrol Engine Fuel Supply System of Automotive Engine Design

Answer 1

Correct choice is (c) At high altitude

To explain I would say: At high altitudes, the mixture tends to become richer in a single jet carburetor as there is no supply of air at higher altitudes due to which the engine will have more fuel consumption when compared to an engine at sea level.