AME - Aircraft Maintenance Engineer Gas Turbine Engine Theory Questions and Answers

Question 1

Which of the following describes the primary function of the turbine section in a gas turbine engine?

Accepted Answer

To drive the compressor and accessories by extracting energy from the hot gas stream.

Answer

To increase the pressure of the air entering the combustion chamber.

Answer

To mix fuel with compressed air and ignite the mixture.

Answer

To decrease the velocity of the exhaust gases to prevent structural damage.

Question 2

A turbofan engine is operating at a constant high-altitude cruise. If the density of the air entering the engine decreases, what is the most likely effect on engine performance, assuming RPM remains constant?

Accepted Answer

Thrust will decrease due to reduced mass airflow.

Answer

Thrust will increase due to lower air resistance.

Answer

Fuel consumption will decrease significantly.

Answer

Exhaust gas temperature (EGT) will decrease.

Question 3

In the context of the Brayton cycle as it applies to a gas turbine engine, what process occurs within the combustion chamber?

Accepted Answer

Constant-pressure heat addition

Answer

Isentropic compression

Answer

Isentropic expansion

Answer

Constant-volume heat addition

Question 4

An aircraft's turboprop engine utilizes its gas turbine core primarily to do what?

Accepted Answer

Drive a propeller through a reduction gearbox.

Answer

Generate the majority of its thrust from the high-velocity exhaust gases.

Answer

Drive a large fan for high-bypass airflow.

Answer

Heat the air for a ramjet effect at high speeds.

Question 5

During engine operation, the airflow passages in the compressor section are designed to be divergent in shape between stages. What is the primary purpose of this design?

Accepted Answer

To convert the kinetic energy (velocity) of the airflow into potential energy (pressure).

Answer

To increase the velocity of the airflow for better combustion.

Answer

To decrease the pressure of the airflow while increasing its velocity.

Answer

To cool the compressed air before it enters the combustor.

Question 6

A maintenance technician is inspecting the combustion section of a gas turbine engine. Which of the following is a primary function of this section?

Accepted Answer

To add chemical energy to the compressed air by burning fuel at a constant pressure.

Answer

To extract mechanical energy to power the engine's accessories.

Answer

To increase the mass of air flowing through the engine using bypass ducts.

Answer

To reduce the temperature of the gas stream before it enters the turbine.