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.