Why are heavy fuels not usually prone to the problems of microbiological infection?

Correct Answer: Option D — The necessary nutrients that the organisms feed on are in a more complex form and not available for microbial degradation.

Heavy Fuel Oil (HFO) must be preheated to achieve proper atomization viscosity (10-15 cSt) at the fuel injectors. Improper viscosity causes poor spray atomization, delayed ignition, and combustion chamber fouling.