Question

If bypass ratio of subsonic non afterburning engine is 1.5 then, what will be the value of maximum thrust specific fuel consumption.

(a) 0.556

(b) 0.12

(c) 0.0789

(d) 0.092

This question was addressed to me in an interview for internship.

This intriguing question originated from Propulsion in division Propulsion and Fuel System Integration of Aircraft Design

Answer 1

Right choice is (a) 0.556

The best I can explain: Given, BPR =1.5

Maximum thrust SFC = 0.67*e^(-0.12*BPR) = 0.67* e^(-0.12*1.5) = 0.556.