AMT Turbine Engine Principles Questions and Answers

Question 1

The operation of a gas turbine engine is described by the Brayton cycle. Which of the following represents the correct sequence of the four events in an ideal Brayton cycle?

Accepted Answer

Compression, Combustion, Expansion, Exhaust

Answer

Intake, Compression, Combustion, Exhaust

Answer

Compression, Power, Intake, Exhaust

Answer

Intake, Power, Combustion, Compression

Question 2

In a gas turbine engine, what is the primary function of the diffuser section located between the compressor and the combustion chamber?

Accepted Answer

To decrease the velocity and increase the pressure of the air.

Answer

To increase the velocity and decrease the pressure of the air.

Answer

To mix the compressed air with fuel before combustion.

Answer

To add swirl to the airflow for better combustion stability.

Question 3

Which of the following is a primary advantage of an axial-flow compressor compared to a centrifugal-flow compressor in large, high-performance turbine engines?

Accepted Answer

Greater efficiency and ability to handle high mass airflow.

Answer

Simpler and more rugged construction.

Answer

Higher pressure rise per stage.

Answer

Wider range of stable operational speeds.

Question 4

A modern commercial airliner is typically powered by high-bypass turbofan engines. What is the main benefit of having a high bypass ratio?

Accepted Answer

Improved fuel efficiency and reduced engine noise.

Answer

Higher exhaust gas temperature for increased thrust.

Answer

Increased core engine speed for faster acceleration.

Answer

Simplified engine design with fewer moving parts.

Question 5

While a gas turbine engine's ultimate purpose is to produce thrust, what is the primary role of the turbine section within the engine?

Accepted Answer

To extract energy from the hot gases to drive the compressor and accessories.

Answer

To ignite the fuel-air mixture.

Answer

To create the final high-velocity exhaust stream.

Answer

To reduce the pressure of the exhaust gases to ambient levels.

Question 6

The production of thrust in a turbine engine is best explained by which physical principle?

Accepted Answer

Newton's Third Law of Motion

Answer

Bernoulli's Principle

Answer

Pascal's Law

Answer

The Venturi Effect