Turbines 2
Which of the following is NOT a type of fuel system?
Neuro-electric
Hydro-mechanical
Hydro-pneumatic
FADEC
Which fuel system component is operated by the fire handle?
The fuel pressure regulating valve
The fuel flow divider
The engine-driven fuel pump assembly
The spar valve
Select a medium that can be used to heat engine fuel from the following
LP turbine discharge air
Hydraulic fluid
Engine oil
Fan discharge air
What is the purpose of the red 'pop-out' indicator on some fuel filter housings?
Indicates a filter clogging condition
Identifies the type of filter installed
Identifies when the filter requires its annual inspection
Provides a warning of a leak at the fuel metering valve upstream of the filter
Where is the fuel metering valve physically located?
The fuel pump assembly
The fuel flow divider
The P&D (pressurization & dump) valve
The fuel control unit
What fuel system component receives the throttle lever input?
The fuel pump assembly
The fuel flow divider
The fuel control unit
The P&D (pressurization & dump) valve
When would the fuel system spar valve normally be closed by maintenance personnel?
Whenever there is an upstream fire or overheat, between the fuel tank(s) and the valve
During engine ground run-ups
During a wet cycle to check for fuel flow
When disconnecting a fuel line downstream from the valve
What does FADEC represent in contemporary engine fuel systems?
Fuel Automatic Digital Engine Control
Fully Automatic Dual Electronic Control
Fully Automatic Digital Electronic Control
Full Authority Digital Engine Control
What is the common name for a fuel nozzle with two concentric spray patterns?
Dual nozzle
Duplex nozzle
Twin nozzle
Double nozzle
The pressurizing & dump valve schedules primary and secondary fuel flow to fuel nozzles. What is its other function?
Add air to the fuel nozzles for proper atomization in the combustion chamber
Boost the pressure from the engine-driven fuel pumps to ensure a positive fuel supply
Provide positive fuel cutoff at engine shutdown, draining fuel from the manifolds
Remove contaminants from the fuel system, prior to entering the combustion chamber
What remedy is applied to reduce the risk of fuel icing and microbial growth?
The use of fuel additives
Draining the fuel tank(s) prior to aircraft fuelling
Borescoping the fuel tank(s) during every C-check
Using Avgas periodically to flush the system
What type of aircraft commonly use Jet A fuel?
Piston-powered aircraft
Military aircraft
Civilian aircraft
Air ships
What is the purpose of conducting a S.O.A.P. Test on a turbine engine?
To inspect for water contamination of hydraulic fluid
It's part of condition monitoring to ensure that the compressor and turbine blades are not eroding
Check for metallic particle content in the engine oil
Determine that the compressors are clean (to optimize engine performance)
Which of the following is NOT a type of fuel control system?
Hydro-mechanical
Hydro-pneumatic
FADEC
Supervisory hydro-photonic
What remedy is applied to reduce the risk of fuel icing and microbial growth?
The use of fuel additives
Draining the fuel tank(s) prior to aircraft fueling
Borescoping the fuel tank(s) during every C-check
Using Avgas periodically to flush the system
What procedure must be carried out prior to disconnecting an ignition lead from an igniter on a high energy ignition system?
Dry cycle (motor) the engine to remove any residual fuel from the combustion chamber
Ensure that the aircraft is in a hangar
Pull the ignition circuit breaker and wait the allotted time as per the maintenance manual
Test the ignition system to make sure that there is no residual fuel in the combustion chamber
How is combustion sustained after an engine start is completed on most turbine engines?
Both igniters are selected on.
A single igniter remains energized.
Combustion is self-sustained, with both igniters selected to 'Off' or 'Auto.'
A single igniter pulses once every minute.
Which type of engine commonly uses a glow plug as its ignition source?
High bypass turbofan
Medium bypass turbofan
Small gas turbine engine
All auxiliary power units (APUs)
You have confirmed that the ignition system has been turned off in the flight deck. What additional safety procedures (if any) are required prior to disconnecting an ignition lead on a high energy ignition system?
Pull the applicable circuit breaker(s) in accordance with the maintenance manual.
Carry out an engine dry cycle (i.e. Motor the engine using the starter, without turning on fuel or ignition)
Pull the applicable circuit breaker(s) and wait the allotted time in accordance with the maintenance manual.
No additional procedure is required, as long as the system has been selected off in the flight deck.
When would ignition cut out during an engine start?
Ignition shuts off when the starter cuts out.
At or near completion of engine start
Ignition stays on at all times to sustain combustion.
Only when it is manually selected off in the flight deck
What ATA chapter is engine ignition?
73
74
76
80
What action is required if an igniter plug is dropped during installation?
The igniter plug must be discarded and a new one installed.
A visual inspection must be completed as per the maintenance manual.
An ultrasound inspection must be performed on the igniter plug.
A visual inspection must be carried out, followed by sand-blasting the centre electrode to ensure that it's clean.
What are you primarily checking when inspecting the tip of an igniter plug?
Signs of erosion
Carbon buildup
Unburned fuel deposits
Foreign object damage (FOD)
What is the ATA chapter for engine ignition?
74
77
78
80
What procedure must be accomplished prior to carrying out an engine ignition test (firing the igniters)?
Motor (dry cycle) the engine to clear out any residual fuel in the combustion chamber.
Pull the ignition circuit breakers.
Place the aircraft on jacks to disable the fuel pumps.
Disconnect the igniter leads from the exciter box(es).
What is the purpose of using compressor bleed air to pressurize engine bearing compartments?
Support bearing operation
Aerate the oil to prevent cavitation
Prevent oil leakage past the seals
Sprays a fine mist through the oil nozzles for atomization
What air source provide engine nacelle cooling and ventilation?
Low pressure (LP) turbine discharge air
High pressure (HP) turbine discharge air
Cabin air
Ambient or fan discharge air
How are the various nacelle cooling and ventilation areas identified on most engines?
Area
Zone
Station
Reference
What is the purpose of the low and high pressure turbine active clearance control system?
Optimize tip clearance between the blades and the engine casing
Increase the tip clearance between the blades and engine casing
Help prevent the main engine shaft from warping
Lower the temperature in the turbine section, to increase the engine service life
What is the purpose of pressurizing engine bearing compartments with compressor discharge air?
Helps to keep the bearings clean
Atomizes the oil entering the bearing compartment
Prevents oil from leaking past the bearing compartment seals
Provides bearing compartment cooling
Select the correct answer regarding the Inlet Duct?
Is a convergent duct to increase inlet air velocity
Assists thrust reverser functions on lading
Is a divergent duct to increase air velocity
S a neutral duct, has no affect on air velocity
The Exhaust Nozzle is
Is a convergent duct to increase inlet air velocity
Provides bleed air for pressurization and anti-ice functions
Is a divergent duct to decrease air velocity
Is a neutral duct, has no affect on air velocity
The definition of a Compressor Stage is
The Inlet Duct
A Stator followed by a Rotor
Inlet Guide Vanes (IGVs)
The Rotor Followed by a Stator
Select the answer that best describes the Intermediate rotor?
N1
N2
The inlet duct
N3
The definition of a Turbine Stage is
The inlet duct
A stator followed by a rotor
Inlet Guide Vanes (IGVs)
The rotor followed by a stator
A stator followed by a rotor
What alternate procedure can be carried out if the engine does not shut down using the fuel shut off switch in the flight deck?
Continue to run the engine until the fuel tank empties
Use the fuel cross feed system to transfer fuel out of the applicable tank and allow the engine to starve of fuel
Pull the fire handle
Open up the cowling and manually close the high pressure fuel shutoff valve at the FCU
Identify the primary purpose of the fuel/oil heat exchanger in the illustration
Heat the oil to prevent oil pump cavitation
Cool the fuel to prevent the HP pump from overheating
Heat the fuel so that ignites easily in the FCU
Heat the fuel to remove ice crystals
Which fuel control system uses modified compressor discharged air to control the position of the metering valve?
Hydromechanical
Supervisory EEC
FADEC
Hydropneumatic
Where does unmetered fuel become metered fuel in a fuel control system?
At the high pressure fuel pump
At the firewall shutoff valve
In the fuel control unit
In the flow divider
What is the purpose of the fuel temperature sensor shown in the illustration?
Provides fuel temperature indication in the flight deck
Helps to maintain a stable fuel temperature by controlling airflow through the heater
Sends compressor air inlet temperature information to the controlling computer
Provides fuel temperature information for the controlling computer
{"name":"Turbines 2", "url":"https://www.quiz-maker.com/QPREVIEW","txt":"Which of the following is NOT a type of fuel system?, Which fuel system component is operated by the fire handle?, Select a medium that can be used to heat engine fuel from the following","img":"https://www.quiz-maker.com/3012/images/ogquiz.png"}