TCCA Powerplant Turbine Practice Test

These questions are part of the practice quiz. Start practicing

• At high altitude where RAM recovery occurs, what is the inlet pressure compared to ambient pressure?
• What role does the HP compressor play in cooling the turbine?
• How are turbine blades replaced?
• What is the term used to describe the curved face of a propeller blade?
• What percentage of total engine energy is absorbed by the turbojet fan?
• Which of the following is a disadvantage of an axial flow compressor?
• What type of fire detection system uses thermocouples?
• What is the usual sequence for starting a turbine?
• Why is controlling velocity important in the compressor section?
• Which component is crucial for directing airflow into the combustion can?
• In terms of fuel delivery, which occurrence is least likely to cause vapor lock?
• What occurs during a hot start in a turbine engine?
• What is the maintenance protocol for the last chance filter in a turbine engine?
• At what engine condition should fuel be switched on during startup?
• What does the knuckle pin connect in a turbine engine?
• Why is it important for a compensator cam to operate at a fixed engine RPM?
• What is a primary indicator of a malfunctioning oil system in a turbine?
• Where does the oil primarily remove heat in an engine?
• How does the fuel air heat exchanger contribute to engine operation?
• What effect does a dirty compressor have on the performance of a gas turbine engine?
• Where does oil heat absorption primarily occur in a gas turbine?
• What is the primary method used for measuring voltage and current in propeller anti-ice testing?
• In a free turbine engine, what percentage of the total thrust is typically extracted by the gas generator turbine?
• What is the purpose of the intermediate gearbox in a turbine engine?
• What type of load is primarily absorbed by roller bearings in a free power turbine engine?
• What is a key characteristic of multi-chamber combustion cans in turbojet engines?
• What occurs in a convergent duct with respect to velocity and pressure?
• What condition may result if the angle of attack (AOA) is excessive on the compressor blades?
• At what speed does a 4 lobe cam ring rotate relative to the crankshaft?
• What is the function of the interconnecting tube in a gas turbine engine?
• What must be done after the Fuel Control Unit (FCU) is changed?
• The spectrometric oil analysis test primarily provides information about what?
• In a turboshaft engine, what percentage of energy is absorbed by the turbine wheel to turn the propeller?
• If the oil line between the scavenger pump and the oil cooler bursts, what will happen to the return oil?
• What is the purpose of a blow-in door in a turbojet engine?
• Which of the following is NOT a type of turbine used in turbine engines?
• What is the primary purpose of adjusting the fuel flow in a turbojet engine?
• What is the probable cause of fluctuating oil pressure in a turbine engine?
• From which section of the engine is bleed air typically sourced?
• In a reverse flow annular combustion chamber, from where does air enter?
• What may happen if the fuel flow to a turbine engine is interrupted?
• In what units are turbine engine ignition systems measured?
• How do labyrinth seals contribute to turbine engine performance?
• Which three parameters are monitored by the Fuel Control Unit (FCU)?
• How are variable inlet guide vanes actuated in a gas turbine?
• What do pre swirl vanes in combustion liners primarily improve?
• Where does the oil for hydraulic lifters in a turbine engine typically come from?
• What are the successive changes imposed on air flowing through an axial engine?
• What should a pilot first suspect if there is no power turbine reading on a cold day startup?
• What mechanism prevents oil from draining into the accessory gearbox in a dry sump engine?
• In turbine engines, the primary purpose of the gas generator is to:
• On a turboprop engine, what drives the prop reduction gears?
• In a thrust augmentation system, where is the cooling solution typically injected?
• What is the main function of a diffuser in a turbine system?
• What is the voltage of the oil temperature bulb on a turbine engine?
• How is 'slip' defined within propeller dynamics?
• Which type of engine is most efficient for high-speed and high-altitude flight?
• What specific operational phase commonly employs beta mode in turbine engines?
• What does the torque indicating system in a turbine engine measure?
• What component drives the governor in a turbine engine?
• Which system is typically used for monitoring the engine performance in turbine engines?
• Why is the overspeed governor important in a hydromechanical fuel pump?
• Which method is commonly used for temperature measurement in turbine engines?
• What is the main purpose of primary air in the combustion chamber?
• What percentage of the air is generally used to support combustion in a turbine engine?
• What happens when there are cracks in swirl vanes?
• What materials are the outer layers of an insulation blanket typically made of?
• A speed sensitive control in turbine systems operates using which mechanical components?
• What type of combustion can is considered most efficient in centrifugal type compressors?
• Why does the scavenger oil system have a greater capacity than the pressure system?
• What is the purpose of the prop cuff in turbine engines?
• What does a filter bypass valve allow during a filter failure?
• What could cause erratic oil pressure indications in a gas turbine?
• Where is the oil temperature regulator usually located?
• What is the purpose of soaking a pressure carburetor?
• What is the temperature measured aft of the turbine referred to as?
• What is the function of exhaust cones in a turbine engine?
• Which of the following best describes Newton's Second Law of Motion?
• What is the primary reason for using low volatile synthetic oil in turbine engines?
• What makes ignitor plugs less susceptible to fouling in turbine engines?
• Which method is used to cool the turbine disc?
• Where is the oil temperature bulb located in a wet sump system?
• What is the significance of knowing compressor inlet pressure during flight?
• Which metals are used in the construction of an EGT (Exhaust Gas Temperature) sensor?
• In what manner may an FCU be calibrated?
• To obtain more thrust from a gas turbine engine, what may be injected?
• From where do the IGVs receive their controlling signal?
• What is the first sign of a potential problem in a gas turbine engine during startup?
• What is the correct starting sequence for a turbojet engine?
• Which of the following are common types of thrust reversers?
• What effect does high altitude have on synthetic oil in turbine engines?
• Where are the longest blades typically located in a turbojet engine?
• What does a high EGT reading often suggest about engine performance?
• What component typically manages the flow of anti-ice fluid in turbine systems?
• What condition necessitates trimming an FCU?
• What material is commonly used to make the impeller of a centrifugal flow compressor?
• What effect does high temperature have on turbine components?
• What is the function of the stator vanes in the compressor section?
• What type of lubrication system is most common in modern engines?
• What is the maximum allowable tip misalignment for a propeller?
• What is indicated by a rising EGT during engine start?
• What is a common consequence of operating a gas turbine at high RPM for extended periods?
• How can cleaning of the compressor section be accomplished?
• What is the primary purpose of using ball bearings in turbine engines?
• What is referred to as a blade profile in turbine engines?
• In a turbofan engine, how is the fan driven?
• Where does the most wear occur on a turbine engine?
• What is the primary cause of inflight flameouts in a turbine engine?
• After an accessory change in a free turbine engine, is it necessary to rig N1 and/or N2 compressor?
• Where is the highest gas pressure found in a turbine engine?
• What action should be taken if a crack is discovered on a turbine disk?
• What is the primary purpose of the stator system in the turbine section?
• Is it considered normal for a turbine blade to be loose at any point during operation?
• What is the correct sequence of events to sustain operation in a gas turbine engine?
• What could be a cause of cracks perpendicular to the leading edge of a first stage single turbine blade?
• What is one primary advantage of using an axial flow compressor?
• What is a common indicator of the need for oil analysis in aircraft engines?
• What is the most commonly used method for cooling and relieving thermal stresses on a turbine?
• What is the role of a speed sensor in a tacho-gen system?
• Which factors significantly influence gas turbine thermal efficiency?
• What thermodynamic cycle does a gas turbine engine operate on?
• What might hot spots on a tail cone of a turbine indicate?
• What are the components of the front cone of a propeller?
• How is the compression ratio of an axial flow turbine engine calculated?
• When using water injection in turbines, what type of water is recommended to reduce mineral build-up?
• Which aspect of turbine operation is most affected by the thrust reverser design?
• What is the primary function of the oil temperature regulator?
• EPR is the ratio of which two measurements?
• From where is air usually taken for anti-icing in a gas turbine engine?
• Which characteristic is associated with labyrinth seals?
• In the context of oil systems in engines, what is the term for ensuring contaminants don’t reach critical areas?
• How are temperature indication probes connected in an engine system for reliability?
• What is the key feature that differentiates turboprop engines from turbojet engines?
• What role do variable stator vanes play in a turbine engine?
• In which type of engine is a separate turbine used to drive an accessory gearbox?
• Dilution of oil in a turbine engine is typically caused by?
• What happens to air in a convergent duct when it reaches supersonic speed?
• An engine with a 3:1 bypass ratio is categorized as what type of engine?
• What type of adjustments can be made to maintain efficient operation of a gas turbine engine?
• What two fuel adjustments can be made to a turbojet engine?
• Which system is employed to maintain engine temperature and avoid ice formation on critical components?
• In high bypass turbofan engines, what is the thrust ratio produced by the core in relation to the fan?
• Which type of oil should never be mixed in turbine engines?
• What is the range of power typically extracted by the gas generator turbine?
• If a pilot complains of loss of power after continued operation of a gas turbine, what can a mechanic do?
• What is the main advantage of an axial flow compressor compared to a centrifugal compressor?
• What type of air is required for activating a pneumatic starter on a turbine engine?
• What does the typical color code for oversized studs indicate?
• What type of ignition system is commonly used in gas turbines?
• How does the compensator cam operate in a turbine engine?
• What is the dual operation capability of a starter generator?
• What term is used to describe the temperature measured aft of the turbine?
• Static thrust refers to the amount of thrust produced when the engine is:
• How does an increase in exhaust gas temperature (EGT) affect turbine engine performance?
• When an aircraft operates on gravel runways and experiences compressor stall, what is the first condition a mechanic would investigate?
• What is the recommended procedure for addressing cracks in swirl vanes in the combustion can?
• Why should synthetic oil never be mixed?
• A fuel pressurizing valve is used alongside which component?
• How do carbon seals function on a turbine engine shaft?
• What indicates a false start in a turbine engine?
• Which of the following components is crucial for the operation of a turboshaft engine?
• What happens to engine thrust output above 36,000 ft?
• How is thrust indicated on a turbofan engine?
• What must a starting system continue to supply until the engine reaches a predetermined RPM?
• What type of fuel pump delivers more fuel than required by the fuel control unit?
• If a gas turbine has operated at 85% RPM for more than 1 minute prior to shutdown, what should you do?
• When should the starter be disengaged during engine operation?
• Which component in the turbine is responsible for transferring most of the heat?
• What size contaminants does a fuel filter typically remove?
• Turbine blades are primarily subject to which type of distortion?
• What types of ignition system are commonly used on gas turbine engines?
• Which of the following may indicate a malfunction in a turbine engine?
• What is a primary indicator of main bearings distress in an engine?
• Which type of combustion is commonly used in turbine engines?
• Under which conditions is engine trimming considered most accurate?
• A clamshell door on a turbine engine serves what type of function?
• Where does the main oil filter strain the oil in a turbine engine?
• What is the primary function of a fuel air heat exchanger?
• What materials are jet engine thermocouples typically made of?
• Besides RPM, EGT, and compressor inlet temperature, what additional factor must be known to set the fuel flow in flight?
• If an engine displays high oil temperature across all power settings, what might be the issue?
• Which component is essential for measuring engine torque electronically?
• Which are the two most common fuel nozzles used in turbine engines?
• What component drives the accessory section in a gas turbine engine?
• What classifications exist within turbine ignition systems?
• What is a characteristic of ignitor plugs on a turbine engine?
• What is the primary function of a propeller synchronization system?
• How can fuel nozzles be effectively cleaned?
• In a low bypass engine, what is the typical bypass ratio?
• In a successful engine start, what happens to the Exhaust Gas Temperature (EGT)?
• What type of probe is commonly located before the first stage turbine wheel?
• Which factor is most critical for determining the operational efficiency of a gas turbine?
• What is a disadvantage of having the cowl flap fully open on the ground?
• Where is the dump valve located in a fuel system?
• What types of loads do ball bearings primarily absorb in gas turbines?
• What operating principle does a torque indicating system utilize?
• In what scenario should the fuel flow be interrupted immediately during startup?
• Before trimming a fuel control unit, a mechanic must be aware of which parameters?
• An electronic torque indicating system consists of what primary components?
• Which types of ignition systems are most commonly used in turbine engines?
• How does an RPM indicator display its readings?
• What maintenance action is suggested if a gas turbine engine is suspected of operating with incorrect temperature?
• Where is the last chance filter in a fuel system located?
• What does an increase in oil temperature without power change indicate?
• How is the inspection for an exhaust cabin heater typically conducted?
• What happens when there is fuel starvation in a turbine engine?
• What component helps reduce turbine vibration in gas turbines?
• When does starter disengagement timing occur in an aircraft engine?
• How are inlet guide vanes protected from icing?
• What is considered the main advantage of a centrifugal airflow compressor?
• What is the primary function of combustor drain valves in gas turbine engines?
• How does the EPR affect engine performance?
• What is the primary function of the fuel control unit (FCU) in a turbine engine?
• Labyrinth seals are primarily constructed using what design feature?
• A starter generator is primarily engaged to which part of the engine?
• An in-flight engine flame out may be caused by which of the following?
• What indicates a successful engine start in turbine engines?
• In which operations is beta mode primarily used?
• What does the overspeed governor in a hydromechanical fuel pump primarily sense?
• What happens to turbine engine performance as ambient air density decreases?
• What is the relationship between pressure and velocity through a convergent duct?
• What percentage of braking force can thrust reversers provide?
• What information is contained in coded areas of a turbine blade?
• How does a continuous loop fire detection system operate?
• What type of inlets are used in turbine turboshaft engines?
• What is the purpose of a vortex destroyer in an engine inlet?
• To correct for operating temperature deficiencies, what should a mechanic change in the exhaust system?
• The engine starter should be limited to what maximum speed?
• What is the primary purpose of a turbine engine's cooling system?
• What distinguishes a high-tension magneto component in its function?
• Excessive blow by on new rings indicates what problem?
• What does PT7 indicate in turbine engine operation?
• What is the primary function of turbine ignition systems?
• What does a lack of pressure indicated by a compression tester suggest?
• How are turbine ignition system ratings measured?
• What factor primarily affects the thrust produced by a gas turbine?
• When starting a turbojet engine, when should the starter be disengaged?
• Where is the highest pressure area in a turbine typically located?
• Gross thrust measures the amount of thrust produced when the aircraft is:
• A mechanic finds that the air taken for anti icing must be sourced where?
• At what stage does the turbine begin to extract energy from the combustion gases?
• A turboprop engine with 200 Hp and 600 Shaft HP would have what effective horsepower (EHSP)?
• What type of oil pump would not be typically found on a turbine engine?
• What role do variable inlet guide vanes play in turbine operation?
• What type of bearings are typically used to absorb thrust loads in compressor or turbine applications?
• What is the difference between geometric pitch and effective pitch in propellers referred to?
• What does P4 refer to in turbine engine terminology?
• What is the consequence of high oil temperature on turbine performance?
• What is the most common technique used for attaching turbine blades?
• A turbojet engine with high EGT at a desired EPR during takeoff indicates what?
• What does a propeller nut bottoming issue typically indicate?
• A stage in an axial flow compressor consists of what two main components?