Turbines
Turbine Engine Knowledge Quiz
Test your knowledge of turbine engines with our comprehensive quiz! This quiz covers various aspects including fuel systems, engine indicators, and maintenance procedures, designed for aviation enthusiasts and professionals alike.
Challenge yourself with questions like:
- Identify examples of engine condition indicators.
- What procedures are essential before performing engine maintenance?
- Understand the purpose of various engine components.
Identify an example of an engine “condition” indicator from the following:
Torque percentage (turboprops)
Exhaust gas temp (egt)
Engine pressure ratio (epr)
Fan speed (turbofans)
What procedure must be carried out prior to disconnecting an ignition lead from an igniter on a high energy ignition system?
Test the ignition system to make sure that there is no residual fuel in the combustion chamber
Dry cycle (motor) the engine to remove and residual fuel from the combustion chamber
Ensure that the aircraft is in hangar
Pull the ignition circuit breaker and wait the allotted time as per the maintenance manual
Which fuel system component is operated by the fire handle?
The fuel pressure regulating valve
The fuel flow divider
The spar valve
The engine-driven fuel pump assembly
Which system is used as a performance indicator on a turboprop engine?
Free (power) turbine speed
Engine pressure ratio (EPR)
Torque oil pressure
Core engine speed (ng)
What action is required if an igniter plug is dropped during installation?
An ultrasound must be performed on the igniter plug
A visual inspection must be completed as per the maintenance manual
The igniter plug must be discarded and a new one installed
A visual inspection must be carried out, followed by sand-blasting the centre electrode to ensure that its clean
What is the purpose of using compressor bleed air to pressure engine bearing compartments?
Support bearing operation
Prevent oil leakage past the seals
Sprays a fine mist through the oil nozzles for atomization
Aerate the oil to prevent cavitation
As per the diagram, where does unmetered fuel become metered fuel?
High pressure fuel pump
Low pressure fuel pump
Fuel control Unit (F.C.U)
Main fuel shutoff valve (spar valve)
What is the ATA chapter for engine fuel?
80
73
78
75
Which air source provides cooling for the HP turbine and disks?
Low pressure turbine discharge air
Fan discharge air
High pressure compression discharge air
Cabin air
What procedure must be accomplished prior to carrying out an engine ignition test (firing the igniters)?
Dry cycle (motor) the engine to remove and residual fuel from the combustion chamber
Place the aircraft on jacks to disable the fuel pumps
Disconnect igniter leads from exciter boxes
Pull the ignition circuit breakers
What is the purpose of the low and high pressure turbine active clearance control system?
Help prevent the main engine shaft from warping
Lower the temperature in the turbine section, to increase the engine service life
Optimize tip clearance between the blade and the engine casing
Increase the tip clearance between the blades and engine casing
When would the fuel system spar valve normally be closed by maintenance personnel?
During a wet cycle to check for fuel flow
Whenever there is and upstream fire or overheat, between the fuel tanks and the valve
During engine ground run-ups
When disconnecting a fuel line downstream from the valve
What is the advantage of using a borescope to perform and engine inspection?
The engine does not require disassembly
No experience is required
Repairs can be made through the borescope probe
All of above is correct
What does the acronym SOAP represent?
Spectrometric Oil Analysis Program
Spectrographic Oil Analytical Process
Spectral Organic Analytical Process
Septic Organ Analysis Program
Which procedure can be accomplished to remedy a declining trend in engine performance?
The engine must be removed and sent to overhaul immediately
A high power run with the fuel selected to rich, to burn off deposits in the combustion chamber and turbines
Compressor wash
A hot section inspection must be completed
Which parameter is not recorded for engine trend monitoring?
Engine fuel flow (FF)
Engine pressure ratio (EPR)
Exhaust gas temp (EGT)
Engine compression ratio (EGR)
What does the acronym TBO represent?
Time between overhaul
Time between operations
To be overhauled
Time before overhaul
Which of the following is not a non-destructive testing method for turbine engine inspections?
Ultrasound
Orthoscope
MPI
Eddy current
What procedure would you accomplish if you experience a “hot start” during an engine start?
Move the fuel condition lever to off and motor (dry cycle) the engine
Move the fuel condition lever to odd and discharge the fire extinguisher
Activate (discharge) the fire extinguisher
Continue the start and move the power lever to high power in order to blow out the fire
What is the purpose of using the beta ring puller when removing the Hartzell propeller?
The puller is used to release the propeller spinner pre-load for it removal
It is a part of the lockout (safety) procedure during propeller removal
It feathers the propeller to access the propeller mount bolts
It pulls the beta ring forward to access the propeller mount bolts
What is the purpose of the quick reference handbook (QRH) during and engine run?
It is used to calculate centre-of-gravity and fuel loads
The QRH is the pilot procedures manual fro normal aircraft operations
It is primarily used as a quick reference for checking MEL items that could ground the
It contains the checklists for abnormal/emergency operating occurrences
What must be done with the fuel nozzles during PT6A hot section inspection?
A flow (spray pattern) check must be accomplished
They must all be replaced with new nozzles
No action is required as the fuel nozzles are only inspected if issues should arise in service
Only a visual inspection must be performed on the nozzles
You have selected start/ignitions switch on the Cessna conquest for an engine start. Which gauge would you reference first to confirm starter engagement (see picture below)?
PROP RPM gauge
Ng RPM gauge
ITT gauge
TORQUE gauge
You are running a Cessna Conquest PT6 engine at high power and experience and engine fire warning in the flight deck. After cancelling the actual warning and throttling back to idle. What is your next course of action?
Activate the fire extinguisher (discharge the bottle)
Move the start/ignition switch to MOTOR Only to blow out the fire
Move the condition lever to the cutoff position to turn off the fuel
Leave the engine operating at idle until the fire is extinguished by the prop wash
How is the Hartzell propeller aligned to ensure proper installation on the engine
There are 2 dowels on the engine flange that align with holes on the propeller flange.
There is no specific procedure to install the propeller on the engine
The zero on the propeller flange must be aligned with the zero on the engine flange scale
The propeller must be aligned horizontally with the engine #1 cylinder at top dead centre of the compression stroke
Which gauge would you observe after confirming positive fuel flow when selecting the fuel conditions lever to “on” during a Cessna Conquest PT6 engine start?
Ng gauge
TORQUE gauge
PROP RPM gauge
ITT gauge
How often is a PT6A hot section inspection carried out?
During every annual inspection
During every A-check
At ½ T.B.O
It is carried out only if trend monitoring indicates a deterioration of engine performance
What is the purpose of using the propeller protractor?
Checks for propeller blade bend during inspection
Ensurs that the propeller blade arc is correct
Determines the correct propeller pitch angle when adjusting the prop
Measure the #1 cylinder piston positions before top dead center
How is the Hamilton standard propeller that is used in the lab project adjusted?
Adjustment screws on the left asn right sides of the hub assembly
It can only be adjusted during the manufacturing process
Rotating the index pin turn barrel assembly under the hub mount
Stop nuts on the index pin under the counterweight caps
What is the indicated propeller angle reading I the protractor in the picture?
17 degrees
17.3 degrees
18.7 degrees
20 degrees
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