Question

What is the significance of first fuel flow law?

(a) Specific fuel consumption is not considered

(b) Considers temperature and effects of mach number

(c) Assumptions are taken for empirical fuel flow data

(d) Specific fuel consumption is constant

I have been asked this question in final exam.

This key question is from Range and Endurance for Aircraft with Thrust Producing Engines topic in portion Cruising Performance of Aircraft Performance

Answer 1

The correct choice is (d) Specific fuel consumption is constant

The explanation: The significance of first fuel flow law is that the specific fuel consumption is constant. The significance of second fuel flow law is that it considers temperature and effects of mach number. The significance of third fuel flow law is that assumptions are taken for empirical fuel flow data.