In cruise performance the fuel mass flow determines the rate

in-cruise-performance-the-fuel-mass-flow-determines-the-rate

In cruise performance the fuel mass flow determines the rate of change of mass of the aircraft.

A. True

B. False

I had been asked this question in a national level competition.

This interesting question is from Cruising Performance in chapter Cruising Performance of Aircraft Performance

Right option is A. True

For explanation I would say: In cruise performance the fuel mass flow determines the rate of change of mass of the aircraft. It is expressed by the formula Qf=\(\frac{-dm}{dt}\) where dm is mass rate and dt is time rate. The fuel mass is always negative as mass of the aircraft always decreases.