Question

What do you mean by overall pressure ratio?

(a) Ratio of pressure at engine exhaust and inlet front face

(b) Ratio of dynamic to normal pressure

(c) Total pressure divided by stagnation pressure

(d) Stagnation pressure divided by dynamic pressure

I have been asked this question in a job interview.

My doubt is from Propulsion topic in division Propulsion of Aircraft Design

Answer 1

Correct answer is (a) Ratio of pressure at engine exhaust and inlet front face

Easiest explanation: Overall pressure ratio is defined as ratio of pressure at engine exhaust and inlet front face. The overall pressure ratio or opr is used to measure the ability of an engine to accelerate the exhaust. It has direct impact on thrust and propulsive efficiency of the engine.