Question

Maximum economy of engine, is obtained at the air fuel ratio of _________

(a) 13.5:1 to 15:1

(b) 13.5:1 to 15:1

(c) 8:1 to 15:1

(d) 7:1 to 10:1

The question was asked in a national level competition.

I'd like to ask this question from Working Principle of Battery Ignition System topic in division Ignition and Power Transmission of Farm Machinery

Answer 1

Right option is (a) 13.5:1 to 15:1

To explain: Air-fuel ratio (AFR) is the ratio of mass of air to a solid or liquid or a gaseous fuel which is present during combustion. This combustion shall take place in a controller environment such as inside an IC engine or an industrial furnace. Maximum economy of engine, is obtained at the air fuel ratio is 13.5:1 to 15:1.