Question

What is thrust 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

The question was asked by my school principal while I was bunking the class.

This intriguing question originated from Thrust Producing Power Plant topic in portion Aircraft Force Systems and the Equations of Motion of Aircraft Performance

Answer 1

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

Best explanation: The two forms of powerplant used in aircraft propulsion are thrust-producing and power producing. A thrust-producing powerplant is the one whose propulsive force is obtained by increasing momentum of the airflow through the engine.