General Jet Engine Construction Flashcards
A jet engine derives its name from the design in that it uses
A gas driven turbine wheel
Which jet engine is cheaper to manufacture?
Centrifugal type, because of its fewer parts
What is the percentage of combustion efficiency of a gas turbine usually between?
95 and 100 percent
What are the inner and the outer surfaces of an annular-type combustion formed by?
Interlocking stainless- steel bands
The parts on a can-annular combustion section must be removed on a specific order because of the?
Combustion chamber crossover tubes
What is the most common type of fuel nozzle system?
Pressure-atomizing
Why is the “fir tree” method of attaching turbine blades (buckets) to the turbine rotor disc preferred?
Because of the temperature differential between the turbine rotor disc and the blades
Which method of attaching the turbine blades (buckets) to the turbine rotor disc is used most frequently?
Series of grooves or notches broached in the rim of the turbine rotor disc
How many different types of loads can be imposed on a jet engine bearing?
Three
What should you do before you inspect a new jet engine bearing?
Remove the preservative coatings
What are the most commonly used bearing removal tools?
Arbor presses and bearing pullers
Before you install separable bearings, you must ensure the?
Bearings are a match set
What is the recommended method of expanding a bearing race before installation?
To use a hot-oil bath
The RGB on an F100-PW-220 engine reduces speed between the main fuel gear pump and the engine-driven main gearbox by?
52 percent
On a F108 engine, which component serves as a mechanical coupling between the compressor rotor and the transfer gearbox (TGB)?
Inlet gearbox (IGB)
