Question 48Motor Plants - Assistant Engineer

You are correct, the answer is A) the size of the holes in the fuel nozzle. The degree of fuel atomization in a diesel engine cylinder is primarily determined by the size of the holes in the fuel nozzle. Smaller nozzle holes create a finer fuel spray, which allows for more complete combustion by increasing the surface area of the fuel particles exposed to air. This results in better fuel efficiency and reduced emissions. The other options, B) timing of the pump, C) supply pressure to the pump, and D) shape of the combustion chamber, while also important factors, are secondary to the nozzle hole size in determining the degree of fuel atomization.