Question

The residual energy is converted into __________

(a) power

(b) thrust

(c) lift

(d) drag

The question was posed to me in an online quiz.

The doubt is from Cruising Performance topic in chapter Cruising Performance of Aircraft Performance

Answer 1

The correct answer is (b) thrust

For explanation I would say: The residual energy in the exhaust is converted into thrust by the exhaust nozzle. The shaft power is converted into thrust through the propeller. This way the cruise performance characteristics of an aircraft wiith mixed power-plants lies between that of aircraft with pure thrust or pure power-producing plants.