15.17 Turboshaft Engines (Level 1, 2 Questions) Flashcards
(29 cards)
What is a turboshaft engine optimised to produce?
A. Jet thrust
B. Shaft power
C. Propeller torque
B. Shaft power
What unit is turboshaft engine output measured in?
A. Newtons
B. RPM
C. Shaft horsepower
C. Shaft horsepower
What are the two main sections of a turboshaft engine?
A. Turbine and nozzle
B. Gas generator and power section
C. Compressor and afterburner
B. Gas generator and power section
What does the gas generator consist of?
A. Fuel pump and reduction gear
B. Compressor, combustion chamber, igniters, and fuel nozzles
C. Gearbox and power turbine
B. Compressor, combustion chamber, igniters, and fuel nozzles
What does the power section consist of?
A. Fuel lines and starter motor
B. Oil cooler and air intake
C. Turbines, gear reduction system, and shaft output
C. Turbines, gear reduction system, and shaft output
What type of turbine rotates independently in a turboshaft engine?
A. Fixed turbine
B. Primary turbine
C. Free turbine
C. Free turbine
Where is engine RPM reduced in a turboshaft engine?
A. In the air intake
B. At the rear of the engine
C. In the combustion chamber
B. At the rear of the engine
What is required to allow the engine to drive the main rotor gearbox?
A. Afterburner ring
B. Oil cooler
C. Output shaft
C. Output shaft
How is flexibility provided for the driveshaft?
A. With rubber dampers
B. By a flexible coupling of stainless steel discs
C. Using a hydraulic actuator
B. By a flexible coupling of stainless steel discs
What signal does fuel control respond to in a turboshaft engine?
A. Temperature signal
B. Airspeed signal
C. Crew power input
C. Crew power input
What modern systems control turboshaft engines?
A. Manual throttle linkage
B. EEC and FADEC
C. Gas generator starter motor
B. EEC and FADEC
What can the output shaft of a turboshaft engine be coupled to?
A. Starter motor
B. Turbine only
C. Engine turbine or a free turbine
C. Engine turbine or a free turbine
What is a turbine called that is located in the exhaust stream and rotates independently?
A. Fixed turbine
B. Free turbine
C. Combustion turbine
B. Free turbine
What unit is turboshaft engine output measured in?
A. Shaft horsepower
B. Kilowatts
C. RPM
A. Shaft horsepower
How many main sections can a turboshaft engine be made up of?
A. One
B. Two
C. Three
B. Two
Which components are part of the gas generator?
A. Compressor, combustion chamber, igniters, fuel nozzles
B. Turbines and gearbox
C. Exhaust and afterburner
A. Compressor, combustion chamber, igniters, fuel nozzles
What does the power section of a turboshaft engine include?
A. Intake and oil cooler
B. Additional turbines, gear reduction system, shaft output
C. Compressor vanes
B. Additional turbines, gear reduction system, shaft output
Why are turboshaft engines commonly used?
A. Low maintenance and soundproofing
B. Large size and simplicity
C. Sustained high power, small size, and reliability
C. Sustained high power, small size, and reliability
Where is RPM reduction typically done in a turboshaft engine?
A. In the intake duct
B. At the rear of the engine
C. In the gas generator
B. At the rear of the engine
What drives the reduction gearbox in a turboshaft engine?
A. Power turbine
B. Free turbine housing
C. Fuel pump
A. Power turbine
What are drive systems in a turboshaft engine used for?
A. To pressurise the fuel tank
B. To control the flight controls
C. To transfer power to components
C. To transfer power to components
What is required to drive the main rotor gearbox?
A. An auxiliary power unit
B. An output shaft from the engine gearbox
C. Fuel pressure
B. An output shaft from the engine gearbox
What is true about engines with internal reduction gearing?
A. They require constant manual throttle
B. Output shaft is at usable speed
C. They can’t power rotor systems
B. Output shaft is at usable speed
What can further reduce output shaft speed for rotor systems?
A. Auxiliary fuel pump
B. Main rotor gearbox
C. Combustion nozzle
B. Main rotor gearbox
