What is propulsive efficiency?- Thermodynamics

Q.  The propulsive efficiency is the ratio of
- Published on 21 Aug 15

a. the propulsive power to the energy input rate
b. the exit velocity rate of exhaust gases to the energy input rate
c. the work done by the turbine to the energy input rate
d. velocity of aircraft to the energy input rate

ANSWER: the propulsive power to the energy input rate

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