Free AMT Powerplant Operations & Maintenance Questions and Answers

Question 1

What is the function of a turbine in a jet engine?

Accepted Answer

Drive the compressor

Answer

In a jet engine, the primary function of the turbine is to drive the compressor. Located downstream of the combustor, the turbine extracts energy from the hot, high-pressure exhaust gases. This energy is then used to turn a shaft that powers the compressor at the front of the engine, sustaining the continuous flow of air necessary for combustion.

Question 2

Which part mixes air and fuel in a piston engine?

Accepted Answer

Carburetor

Answer

In a piston engine, the carburetor is the part responsible for mixing air and fuel. It atomizes the fuel and blends it with incoming air in the correct proportions before the mixture enters the engine cylinders for combustion. This ensures an optimal air-fuel ratio for efficient engine operation and power generation.

Question 3

Why is engine oil important in aircraft engines?

Accepted Answer

Lubricates and cools parts

Answer

Engine oil is critically important in aircraft engines because it lubricates and cools parts. It reduces friction between moving components, preventing wear and tear, and also carries away excess heat generated during operation. Additionally, engine oil helps to clean the engine by suspending contaminants, ensuring smooth, efficient, and reliable performance.

Question 4

What does the magneto system do?

Accepted Answer

Generate spark for ignition

Answer

The magneto system is a self-contained, engine-driven electrical generator that produces high-voltage electrical pulses. These pulses are sent to the spark plugs, creating the necessary spark to ignite the fuel-air mixture in the engine cylinders. This process initiates and sustains combustion, allowing the engine to run independently.

Question 5

Which type of engine powers most modern commercial jets?

Accepted Answer

Turbofan

Answer

Turbofan engines are the most common type of engine used in modern commercial jets due to their exceptional efficiency and high thrust output. They operate by drawing in a large volume of air, with a significant portion bypassing the core engine. This bypass air provides substantial thrust and reduces fuel consumption compared to pure turbojets, making them ideal for long-range commercial flights.

AMT - Certified Aircraft Maintenance Technician Practice Test

AMT - Certified Aircraft Maintenance Technician Practice Test

Free AMT Powerplant Operations & Maintenance Questions and Answers