Test on Gas Turbine Engine Fundamentals
Gas Turbine Engine Fundamentals: Components & Types Explained
Test: Aircraft Turbine Engines, Turbine Engines, Gas turbine combustion systems
20 questions
Question 1: An APU provides electric power and compressed air when the main engines are not operating.
A. Ano
B. Ne
Explanation: The study materials state that an APU provides electric power and compressed air when the main engines are not operating.
Question 2: Which of the following are the two principal types of compressors used in turbojet aircraft?
A. Centrifugal flow
B. Mixed flow
C. Axial flow
D. Radial flow
Explanation: The study materials state that the two most common compressors in use today are the centrifugal flow and the axial flow types.
Question 3: A turbofan engine is an axial-flow turbine engine where the first stage of turbine blades are lengthened to force air around the gas generator.
A. Ano
B. Ne
Explanation: The study materials state that a turbofan engine has the first stage of compressor blades lengthened, not turbine blades.
Question 4: An increase in air density leads to a decrease in the thrust produced by a turbine engine.
A. Ano
B. Ne
Explanation: Air density determines the mass of air used by a jet engine. If density increases, thrust increases, and vice versa.
Question 5: According to the study materials, what is a major difference between a turboprop engine and a turbojet engine?
A. A turboprop engine usually has fewer turbine stages than a turbojet engine.
B. The turboprop engine's turbine is also responsible for driving a propeller.
C. A turbojet engine uses lengthened compressor blades to force air around the gas generator.
D. The turboprop engine operates with a split compressor system, unlike a turbojet.
Explanation: The study materials state that 'A turboprop engine usually has more turbine stages than a turbojet engine' and 'In addition to operating the compressor and accessories, the turboprop turbine must also drive a propeller.' Option 0 is incorrect as it states fewer stages. Option 2 describes a turbofan engine. Option 3 mentions a split compressor system but does not link it as a difference between turboprop and turbojet.