Helicopter Powerplant Flashcards
The gas turbine engine mounted on most helicopters is made up of a
a) Crankcase, carburetor, pistons, and cylinder heads.
b) Compressor, combustion chamber, turbine, and accessory gearbox assembly.
c) Spark plugs, valves, piston, fuel injection system.
B) Compressor, combustion chamber, turbine, and accessory gearbox assembly.
What part(s) of a turbine engine provide power to both the engine compressor and the accessory gearbox?
a) Turbine wheels.
b) Starter/generator.
c) Bleed air system.
A) Turbine wheels.
TOT indicates
a) Turbine Output Temperature.
b) Temperature Out of Turbine.
c) Turbine Outlet Temperature.
C) Turbine Outlet Temperature.
The compressor of a turbine engine consists of
a) An axial compressor, a centrifugal compressor, or combination of the two.
b) An axial compressor only.
c) A centrifugal compressor only.
A) An axial compressor, a centrifugal compressor, or combination of the two.
If the airflow through the compressor is disturbed, a condition called __________ may take effect.
a) Compressor agitation.
b) Surge, or compressor stall.
c) Backflow, or compressor airflow disturbance.
B) Surge, or compressor stall.
The combustion in a turbine engine is
a) Semi-continuous.
b) Only continuous during the start cycle.
c) Continuous.
C) Continuous.
The igniter in a turbine engine serves only to
a) Ignite the fuel/air mixture when starting the engine.
b) Keep the fuel/air mixture continuously ignited during engine operation.
c) Ignite the fuel before it’s mixed with air from the compressor.
A) Ignite the fuel/air mixture when starting the engine.
The first stage of the turbine section is usually referred to as the gas producer, or
a) N1 or NG.
b) N2 or NP.
c) N1 or NP.
A) N1 or NG.
The second stage of the turbine section is usually referred to as the power turbine, or
a) N1 or NG.
b) N2 or NP.
c) N1 or NP.
B) N2 or NP.
In most helicopter turbine engines, the first and second stage turbines are not mechanically connected to each other. This is referred to as a
a) Free-turbine engine.
b) Direct-drive turbine engine.
c) Self-sustaining turbine engine.
A) Free-turbine engine.
What component of a turbine engine houses all the necessary gears to drive the numerous components of the helicopter?
a) Turbine section.
b) Compressor sections
c) Accessory gearbox.
C) Accessory gearbox.
The N1 stage of a turbine engine drives the N1 gear train in the accessory gearbox. Some components driven by the N1 may include
a) Compressor, starter/generator, oil pump, and fuel pump.
b) Main and tail rotor systems.
c) All are correct.
A) Compressor, starter/generator, oil pump, and fuel pump.
The N2 stage of a turbine engine drives the N2 gear train in the accessory gearbox. Some components driven by the N2 may include
a) Compressor, starter/generator, oil pump, and fuel pump.
b) Main and tail rotor systems.
c) All are correct.
B) Main and tail rotor systems.
