NFI Exam Review Questions And Complete Answers Graded A+ 2024.

Combustion Requirements (3) - Answer Air, Fuel, Heat Complete Combustion Produces (4) - Answer Water vapor, carbon dioxide, heat, and non combustible ashes incomplete combustion produces (3) - Answer carbon monoxide, hydrocarbons, and other gases rate at which fuel burns is controlled by - Answer the amount of available air air to fuel ratio is a - Answer critical factor in obtaining optimum fuel combustion BTU - Answer British Thermal Unit, The amount of energy needed to heat one pound of water one degree Fahrenheit wood ignites at - Answer 450-550 F natural gas ignites at - Answer 1,150 F propane ignites at - Answer 920-1120 F electric spark temp - Answer 1,700 F hot surface igniter temp - Answer 2,400 F