What type of burner uses mechanical principles to atomize fuel oil?

The mechanical atomizing burner is the correct choice because it specifically uses mechanical principles to break down fuel oil into fine droplets, enhancing the efficiency of fuel combustion. This type of burner typically employs a mechanical device, such as a rotating element or a nozzle system, which generates high-speed turbulence to atomize the fuel. The mechanical action creates a finer mist of fuel, allowing for better mixing with air and more complete combustion, ultimately leading to improved efficiency and reduced emissions.

In comparison, electric atomizing burners rely on electrical energy to atomize the fuel, while pneumatic atomizing burners utilize compressed air for atomization. Gravity feed burners rely on gravity to supply fuel to the burner but do not have a mechanism for atomization like the mechanical type. This differentiation makes the mechanical atomizing burner unique in its operation and effectiveness in fuel oil atomization.