Question 110General Subjects - QMED

The correct answer is B) Viscosity. The viscosity of the fuel oil is the most significant characteristic when determining the temperature to which the fuel oil must be heated for proper atomization. Fuel oil must be heated to a specific temperature in order to reduce its viscosity and allow for proper atomization during combustion. If the fuel oil is not heated to the appropriate temperature, it will not atomize correctly, leading to incomplete combustion and decreased engine efficiency. The other characteristics, such as flash point, pour point, and specific gravity, are also important factors in fuel oil selection and handling, but viscosity is the primary consideration for determining the necessary heating temperature.