Question

Which of the following Jet Propulsion System does not contain compressor and turbine?

• A. Turbo-jet
• B. Turbo-Prop
• C. Screw Propeller
• D. Ram-Jet

Hint:

To remember this, think of the name: Ram-Jet. It rams the air in using speed instead of using a mechanical compressor. No moving parts = No compressor = No turbine.

Answer 1

The Correct Option is D

Jet propulsion systems are classified based on how they compress incoming air and extract energy to power that compression. Most conventional jet engines rely on mechanical components (compressors and turbines), but certain high-speed designs utilize different principles. 1. Conventional Jet Engines (Turbo-series): Engines like the

Turbo-jet and

Turbo-Prop are part of the gas turbine family.

• Compressor: They use a mechanical compressor (axial or centrifugal) to increase the pressure of incoming air before combustion.

• Turbine: They use a turbine to extract energy from the hot exhaust gases to drive that compressor.

2. The Mechanism of a Ram-Jet: The

Ram-Jet is often referred to as a "flying stovepipe" because it has no moving parts.

• Compression: It relies entirely on the vehicle's high forward speed to "ram" air into the inlet, where the air is compressed by its own dynamic pressure (ram effect).

• Absence of Moving Parts: Because the compression is achieved purely through aerodynamics, there is no need for a mechanical

compressor. Consequently, there is no need for a

turbine to drive such a compressor.

3. Limitation: A major drawback of the Ram-Jet is that it cannot produce static thrust; the aircraft must already be moving at high speeds (typically supersonic) for the engine to function.