A turbo jet engine provides thrust by which of the following mechanisms?

Prepare for the EASA Gas Turbine Engine Test. Enhance your learning with multiple choice questions, hints, and in-depth explanations. Ace your exam!

Multiple Choice

A turbo jet engine provides thrust by which of the following mechanisms?

Explanation:
Thrust comes from changing the momentum of the air exiting the engine. In a turbojet, the air that actually gets accelerated through the engine is the mass flow through the intake and core, which is relatively small compared with the amount of air moved by a propeller. The combustion process adds energy to that air, producing a very high exit velocity. So the engine imparts a large velocity increase to a small mass of air, resulting in the thrust you feel. This contrasts with a propeller, which moves a large mass of air but with only a modest velocity change.

Thrust comes from changing the momentum of the air exiting the engine. In a turbojet, the air that actually gets accelerated through the engine is the mass flow through the intake and core, which is relatively small compared with the amount of air moved by a propeller. The combustion process adds energy to that air, producing a very high exit velocity. So the engine imparts a large velocity increase to a small mass of air, resulting in the thrust you feel. This contrasts with a propeller, which moves a large mass of air but with only a modest velocity change.

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