a) 13.5:1 to 15:1
b) 15.5:1 to 18:1
c) 8:1 to 15:1
d) 7:1 to 10:1
Answer: a
Explanation: 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.
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