Propellers?
Streamlining the blade with the relative wind to reduce drag is called what?
Feathering
In case of engine failure during takeoff, this will feather the prop
TSS, Thrust Sensitive Signal System
Turbofans use long and short ones of these to help aid in sound suppression
fan ducts
These types of engines are thrust producing engines
Turbofan and turbojet
Even though this engine has been around since the 1980s it is still considered experimental.
UHB, Ultra High Bypass
The Compressor, combustor, compressor’s turbine, accessory gearbox make up what section of a turboprop with a free turbine?
gas-generator section
When the engine is shut down, this will keep the propeller from windmilling
Propeller brake system
This type of fan blade allows for the use of longer blades while maintaining engine speeds.
Transonic blade
These types of engines are torque producing engines
Turboprop and turboshaft
Where do would you normally find an APU?
Tail section of the aircraft
add more turbine stages
This will prevent propeller drag
NTS
The bypass ratios of 4.1 and higher are used on what kind of turbofan?
High bypass
Engine pressure as measured between the compressor pressure and the turbine pressure is known as what?
EPR or engine pressure ratio
Newer bypass engines use what kind of indicator as the primary indicator?
N1 RPM
Power developed by the engine is indicated by what?
Torque meter
A backup to the NTS is this.
Safety coupling
EPR and % of RPM are used to indicate what?
Thrust output
This engine type has the smallest frontal area and is the loudest
Turbojet
What kind of starter is used to start an APU?
electric starter
IF THE OUTPUT SHAFT OF THE ENGINE IS DRIVEN BY THE SAME TURBINE STAGES AS THE COMPRESSOR, IT IS KNOWN AS A WHAT?
Fixed turbine
A prop brake uses what to hold it open?
Oil pressure
This engine takes the best advantage of high ram‑pressure ratios?
Turbojet
An APU will most commonly use what type of compressor?
centrifugal
Primary air is known as what?
Core air