Question Statement:
An aircraft with a turbojet engine is flying at 250 m/s. The uninstalled thrust
produced by the engine is 60000 N. The heating value of the fuel is 44 × 10 6 J/kg.
The engine has a thermal efficiency of 35% while burning the fuel at a rate of
3 kg/s. Assume the engine exit pressure to be equal to the ambient pressure. What
is the propulsion efficiency of the engine under these conditions (in percentage)?
Options:
- (A) 32.5
- (B) 35.0
- (C) 11.4
- (D) 92.4