FREE AMT Turbine Engine Principles Questions and Answers

Question 1

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

Accepted Answer

To increase the pressure and reduce the velocity of the air leaving the compressor.

Answer

To mix fuel and air and ignite the mixture.

Answer

To expand the hot gases and drive the turbine wheel.

Answer

To increase the velocity and decrease the pressure of the exhaust gases.

Question 2

A turbofan engine has a bypass ratio of 5:1. What does this indicate?

Accepted Answer

For every 1 part of air that goes through the engine core, 5 parts of air are bypassed around the core.

Answer

The fan is five times larger in diameter than the turbine.

Answer

The engine produces five times more thrust than a comparable turbojet.

Answer

Five parts of the exhaust gas are used for thrust, while one part is used for cooling.

Question 3

During a routine inspection of a turbine engine, a technician finds minor pitting and small nicks on the leading edges of the first-stage compressor blades. According to typical maintenance standards, what is the most likely cause?

Accepted Answer

Foreign Object Damage (FOD)

Answer

Compressor stall

Answer

Turbine blade failure

Answer

Normal operational wear

Question 4

What is the primary thermodynamic cycle upon which all gas turbine engines operate?

Accepted Answer

The Brayton cycle

Answer

The Otto cycle

Answer

The Carnot cycle

Answer

The Rankine cycle

Question 5

In a dual-spool, axial-flow compressor, how is the low-pressure compressor (N1) typically connected to its corresponding turbine?

Accepted Answer

Via a concentric shaft that passes through the hollow high-pressure (N2) shaft.

Answer

Through a reduction gearbox to the high-pressure turbine.

Answer

It is mechanically independent and driven by bleed air.

Answer

Directly to the accessory gearbox.

Question 6

A technician is performing an engine trim on a turbine engine. The Exhaust Gas Temperature (EGT) is found to be exceeding the maximum limit at takeoff power, while other engine parameters like RPM and fuel flow are within their normal ranges. Which of the following is a plausible cause?

Accepted Answer

An obstruction in the engine's exhaust nozzle.

Answer

A malfunctioning fuel control unit (FCU) delivering excessive fuel.

Answer

Damage to the low-pressure compressor (N1) blades.

Answer

A malfunctioning EGT indication system, such as a faulty thermocouple.