AMT Powerplant Systems & Engine Maintenance

Question 1

What is the function of a turbocharger in an aircraft engine?

Accepted Answer

Compresses intake air for higher efficiency

Answer

A turbocharger in an aircraft engine is designed to compress the intake air before it enters the engine cylinders. This compression increases the density of the air, allowing more oxygen to be mixed with fuel, especially at higher altitudes where atmospheric pressure is lower. The result is increased engine power and efficiency, improving performance and maintaining horsepower at altitude.

Question 2

Why are magnetos used in aircraft ignition systems?

Accepted Answer

To provide spark without external power

Answer

Magnetos are used in aircraft ignition systems because they are self-contained electrical generators that produce high-voltage current for the spark plugs independently of the aircraft's main electrical system. This provides a crucial safety feature, ensuring the engine can continue to operate and generate spark even if the aircraft's battery or generator fails. They are a reliable and redundant ignition source.

Question 3

Which component cools engine oil before it returns to the reservoir?

Accepted Answer

Oil cooler

Answer

The oil cooler is a vital component in an aircraft engine's lubrication system, responsible for reducing the temperature of the engine oil. After circulating through the engine and absorbing heat, the hot oil passes through the oil cooler, where it is cooled by ambient air or fuel before returning to the oil reservoir. Maintaining optimal oil temperature is crucial for engine longevity and performance.

Question 4

During an engine inspection, what should be checked to assess cylinder condition?

Accepted Answer

Cylinder compression

Answer

Cylinder compression testing directly measures the sealing integrity of the cylinder, piston rings, and valves. Low compression indicates wear or damage that can significantly impact engine power and efficiency. Therefore, it is a critical assessment during an engine inspection to determine the overall health of the engine's combustion chambers.

Question 5

What type of engine is most commonly found in small general aviation aircraft?

Accepted Answer

Reciprocating engine

Answer

Reciprocating engines, also known as piston engines, are the most common powerplants in small general aviation aircraft. They are favored for their reliability, relatively lower cost, and efficiency at the altitudes and speeds typically flown by these aircraft. Turboprop and turbofan engines, while powerful, are generally found in larger, faster, or more specialized aircraft.

(AMT) Aviation Maintenance Technician Practice Test

(AMT) Aviation Maintenance Technician Practice Test

AMT Powerplant Systems & Engine Maintenance