Question

What is power producing powerplant?

(a) Propulsive force that is directed by increasing momentum of the airflow

(b) Propulsive force that is obtained from shaft power by propeller

(c) Propulsive force that is directed by decreasing momentum of the airflow

(d) Propulsive force that is obtained from engine power by propeller

I have been asked this question by my school principal while I was bunking the class.

My doubt stems from Power Producing Power Plant topic in division Aircraft Force Systems and the Equations of Motion of Aircraft Performance

Answer 1

Right option is (b) Propulsive force that is obtained from shaft power by propeller

Easy explanation: The two forms of powerplant used in aircraft propulsion are thrust-producing and power producing. A power-producing powerplant is the one whose propulsive force is obtained from shaft power by propeller.