Discussion
Fuel flow indication on a turbine engine is normally given in
Answer: C
Correct answer: Mass per unit time
Turbine fuel flow is indicated as a mass flow, in kilograms or pounds per hour, because it is mass rather than volume that determines the energy delivered to the engine.
Fuel density falls appreciably as temperature rises, so a given volume carries different energy at different temperatures and a volumetric reading would mislead. Mass flow avoids that entirely, and it makes fuel used directly comparable with the fuel loaded, which is also weighed. Nozzle pressure and tank contents are different quantities and neither states a rate at all.
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