Flight Operations Flashcards
One of the main advantages of the axial flow compressor type of gas turbine engine as compared to the centrifugal type is:
A) comparatively small frontal area of the compressor
B) lower weight
C) increased efficiency over a wider RPM range
D) ease of manufacture
A) comparatively small frontal area of the compressor
That section of a turbine engine which extracts energy from the expanding high velocity combustion gases to drive the compressor section(s) and fan (or propeller) is the :
A) diffuser section
B) turbine section
C) booster fan section
D) accessory drive section
B) turbine section
That component of a gas turbine engine which is located at the outlet side of a centrifugal compressor and whose function is to convert high velocity airflow into high pressure airflow for delivery to the combustion section is known as the:
A) booster fan section
B) convergent delivery duct
C) planetary drive section
D) diffuser section
D) diffuser section
The majority of the energy produced in the burner section of a turbojet engine is used for?
A) Engine Thrust
B) Hot Bleed Air
C) Running the engine compressor
D) Engine noise
C) Running the engine compressor
In a turbo-fan engine, why is bypassed air more efficient at creating engine thrust?
A) Cooler by passed air is more dense than hot exhaust air, therefore containing more energy
B) The burned fuel mixed with the core air does not produce usable thrust
C) It is not more efficient, the benefit to bypassed air is a reduction in noise
D) Since bypassed air is not used to rotate the compressor section of the engine it can produce more forward thrust
A) Cooler by passed air is more dense than hot exhaust air, therefore containing more energy
Engine N1 and N2 gauges are an indication of what?
A) The rotation rate of the compressor and turbine sections respectively, expressed as a percentage
B) Alternative ways of displaying Engine Pressure Ratio (EPR) on digital EFIS displays
C) Percentage of thrust the engine is producing(N1) as compared to what it should be producing (N2)
D) The rotation rate of the low and high pressure compressors respectively, expressed as a percentage
D) The rotation rate of the low and high pressure compressors respectively, expressed as a percentage
When starting a gas turbine engine the two primary gauges to observe are:
A) the low pressure compressor and the exhaust gas temperature
B) the propeller RPM and the exhaust gas temperature
C) the high pressure compressor and internal turbine temperature
D) the compressor turbine and the free turbine
C) the high pressure compressor and internal turbine temperature
The relationship between the mass flow of cold air through the fan to the mass flow of the hot air through the turbine is known as the:
A) recovery ratio
B) bypass ratio
C) power extraction ratio
D) engine pressure ratio
B) bypass ratio
What provides the rotational energy for an axial flow compressor in a turbojet engine?
A) The low pressure compressor obtains energy from the high pressure compressor which has a higher rotation rate
B) Electrical energy produced from a generator attached to the constant speed drive
C) The engine turbine using bleed air transferred through high stage bleed ducts
D) The engine turbine using energy from hot exhaust gasses exiting the engine’s burner section
D) The engine turbine using energy from hot exhaust gasses exiting the engine’s burner section
What occurs in the burner section of a gas turbine?
A) Fuel is mixed with compressed air then ignited to create the energy needed to run the engine
B) The fuel/air mixture which enters the burner is ignited to create the energy needed to run the engine
C) Excess fuel not used to produce thrust is collected here and ignited in order to run the engine’s compressor
D) Fuel is mixed with air and ignited before moving through the engine compressor and turbine
A) Fuel is mixed with compressed air then ignited to create the energy needed to run the engine
EPR (Engine Pressure Ratio) is correctly defined as:
A) the ratio of turbine discharge total pressure to the total pressure at the compressor inlet
B) the ratio of engine compressor discharged pressure to the engine inlet total pressure
C) the ratio of turbine inlet pressure to turbine discharge pressure
D) the ratio of fan section airflow to basic engine airflow
A) the ratio of turbine discharge total pressure to the total pressure at the compressor inlet
Compressor stall is caused by:
A) the fuel control unit scheduling an inadequate fuel flow to the primary fuel nozzles
B) below normal internal temperatures at the power turbine section
C) excessive angle of attach on the compressor blades
D) stator blade warping when the engine is operating at a high EPR setting
C) excessive angle of attach on the compressor blades
In identifying a compressor stall condition, which of the following would be the predominant symptoms?
1. loud explosive bangs
2. high oil temperature
3. lower EGT or ITT reading
4. lower torque or N1 reading
5. higher than normal fuel
6. higher compressor readings flow
7. higher EGT or ITT reading
8. engine surging
A) 1,4,7,8
B) 1,3,5,8
C) 3,4,6,8
D) 2,4,6,7
A) 1,4,7,8
The purpose of a compressor bleed valve in a gas turbine engine is to:
A) provide hot air for anti-ice purposes
B) maintain a constant pressure across compressor and turbine sections of the engine
C) regulate gas generator RPM during rapid acceleration of the engine
D) reduce the possibility of compressor stall
D) reduce the possibility of compressor stall
The stationary blade-type airfoil devices that are installed between each compressor stage in order to direct the airflow into succeeding stages at the optimum angle in an axial flow compressor are known as:
A) cascade vanes
B) stators
C) impeller blades
D) diffuser vanes
B) stators
A “hung” or false start of a gas turbine engine is one in which:
A) the engine lights up, but the exhaust gas temperature exceeds the allowable limit for an engine start
B) the engine lights up normally, but the RPM, rather than increasing to idling speed, remains at some lower speed
C) too high a fuel flow was scheduled before the engine attained self-accelerating speed
D) the engine shaft bows preventing rotation of the compressors
B) the engine lights up normally, but the RPM, rather than increasing to idling speed, remains at some lower speed
Which of the following statements is true with reference to an engine hot start?
A) The engine lights up normally, but the RPM, rather than increasing to that of idle speed, remains at some lower value
B) The engine lights up normally, however the exhaust gas temperature readings are higher than a normal start
C) During the start the internal turbine temperatures exceed the maximum allowable limit potentially causing damage to internal engine components
D) During the start the exhaust gas temperature exceeds the maximum allowable limit potentially causing damage to the engine cowlings and tail pipe
C) During the start the internal turbine temperatures exceed the maximum allowable limit potentially causing damage to internal engine components
When air is extracted from the compressor section for service functions such as air conditioning or anti-icing then:
A) thrust will decrease and turbine temperature will decrease
B) thrust will increase due to increased combustion chamber efficiency
C) thrust will decrease and turbine temperature will increase
D) thrust will increase and exhaust gas temperature will decrease
C) thrust will decrease and turbine temperature will increase
Which of the following statements is true with reference to thrust reversers on turbofan engines?
A) Clamshell type reversers are mounted around the engine exhaust duct and can only re-direct the hot gases exiting from the hot section forward
B) Target type reversers utilize target doors and turning vanes to redirect both hot and cold thrust forward
C) On Cascade type reverses, blocker doors seal off the fan exit as a sleeve moves to expose the cascade vanes
D) Variable Fan reverses adjust the pitch of the fan blades to re-direct the fan air forward
C) On Cascade type reverses, blocker doors seal off the fan exit as a sleeve moves to expose the cascade vanes
On a low-bypass turbofan engine, how much of engine thrust is reversed when clamshell type engine reversers are deployed on landing?
A) 100%
B) between 50% to 75% depending on aircraft design
C) the effectiveness of reverse thrust is dependent on aircraft velocity
D) there will always be some forward thrust produced with engine reversers deployed
A) 100%
On large turbofan engines reverse thrust is accomplished by which of the following?
A) Reverse thrust is accomplished by pivoting a number of target type blocker doors to deflect the fan airstream forward
B) Target doors which are mounted on the rear section of the engine nacelle open to form a clamshell behind the engine diverting fan and hot exhaust air forward
C) A translating sleeve moves rearward to move the blocker doors in to position and expose the cascade vanes. The blocker doors divert the fan air through the cascades accomplishing reverse thrust
D) Both a and c
D) Both a and c
During “BETA” operation in a turbo-prop aircraft, power lever position
A) schedules the operation of the constant speed unit
B) controls both blade angle and fuel flow ( Beta plus power range)
C) determines the amount of negative torque signal fed to the constant speed unit
D) automatically programs the amount of oil entering the pitch lock regulator
B) controls both blade angle and fuel flow ( Beta plus power range)
A turboprop power plant design known as a “FREE TURBINE” type is one in which:
A) there are two separate shaft- one to drive the compressor section and the other to transmit power to the reduction gearbox and thus turn the propeller
B) the reduction gearbox and thus turn the propeller
C) the reduction gearbox unit is mounted on the outside of the engine in order to isolate the turbine section
D) the compressor turbine and the accessory drive turbine are allowed to rotate in opposite direction in order to reduce gearbox vibration
A) there are two separate shaft- one to drive the compressor section and the other to transmit power to the reduction gearbox and thus turn the propeller
In an aircraft equipped with reversing-type propellers, undesired propeller reversing in flight is prevented by the installation of which of the following devices?
A) low pitch synchro-transducers
B) a high pitch bias actuator and associated blade angle detector
C) a high pitch governor
D) low pitch stops
D) low pitch stops
In reference to a turbo-prop, constant speed operation is achieved by
A) using the exhaust air exiting from the power section to drive the power section
B) using a series of reduction gear to reduce the turbofan speed to approximately 2000 RPM
C) brining the condition levers to the appropriate setting for the phase of flight
D) matching the propeller load to the gas turbine power produced
D) matching the propeller load to the gas turbine power produced
What is the main function of an Electronic Engine Control (EEC) or an Electronic Control Unit (ECU)?
A) To act in a fuel metering capacity to provide accurate fuel flow information to the cockpit engine gauges
B) To provide accurate power or thrust information to the engine power gauges in the cockpit
C) To regulate engine fuel flow to maintain specific power settings as flight and environmental conditions change
D) In fly by wire designed aircraft to transmit the desired power or thrust from the throttle quadrant to the fuel control unit on the engines
C) To regulate engine fuel flow to maintain specific power settings as flight and environmental conditions change
APU’s on aircraft are generally used for…
- generation of electrical power
- heating/air-conditioning of the aircraft on the ground
- hydraulic system operation when the A/C is on the ground
- starting jet engines
- aircraft anti-icing systems on the ground
A) 1,2,5
B) 1,3,5
C) 2,4,5
D) 1,2,4
D) 1,2,4
The flex temperature for a gas turbine engine refers to:
A) The maximum operating temperature limit for maximum continuous power.
B) The maximum operating temperature limit for compressor turbine section of the engine
C) The ambient air minimum starting temperature for the engine
D) The assumed temperature used in calculating the reduced thrust settings for take-off
D) The assumed temperature used in calculating the reduced thrust settings for take-off
What is the purpose of assumed temperature or de-rated takeoffs?
A) They reduce fuel consumption
B) They increase passenger comfort by slowing acceleration
C) They reduce engine noise for certain noise abatement procedures
D) They reduce engine wear
D) They reduce engine wear
In a turbojet aircraft, how does switching engine bleed-air valves off for departure provide better takeoff performance?
A) No bleed-air allows for the pressurization outflow valve to close reducing drag
B) This only applies to aircraft that use bleed-air for wing anti-ice
C) Having bleed-air valve closed allows the engines to produce greater thrust
D) Switching bleed-air off moves engine compressor blades to higher compression levels
C) Having bleed-air valve closed allows the engines to produce greater thrust
A bleed leak warning light illuminated in the cockpit could be an indication that there is a:
A) break bleed line fluid leak, which could result in a primary brake system failure
B) hydraulic air bleed system failure resulting low hydraulic system pressure due to lack of air pressure in the reservoir
C) bleed air leak within air cycle compressor and expansion turbine resulting in a pressurization failure
D) pneumatic air bleed leak which left unattended could result in a fire within the aircraft
D) pneumatic air bleed leak which left unattended could result in a fire within the aircraft
Which of the following statements best describes an aircraft pressurization system?
A) Bleed air from the engines is continually distributed to the cabin area, outflow valves control the amount of air allowed to escape to obtain the desired level of pressurization
B) Bleed valves control the amount of bleed air allowed to enter the cabin area to obtain the desired level of pressurization
C) Ram air is vented into the cabin area utilizing ram air turbines, outflow valves control the amount of air allowed to escape to obtain the desired level of pressurization
D) Engine driven air cycle packs distribute air to the cabin area, inflow valve control the amount of air allowed to escape to obtain the desired level of pressurization
A) Bleed air from the engines is continually distributed to the cabin area, outflow valves control the amount of air allowed to escape to obtain the desired level of pressurization
With respect to aircraft pressurization systems, identify which of the following statements is FALSE?
A) Modern aircraft pressurization systems start to pressurize the cabin during the take-off run at which time a descent would be noted on the cabin rate of climb/descent indicator
B) The maximum cabin altitude of a pressurized aircraft should not normally exceed 12,500 feet ASL
C) During a normal pressurized climb, following take-off, the cabin rate of climb would be less than the aircraft rate of climb
D) If during descent the aircraft altitude becomes equal to the cabin altitude, the rate of descent of both the cabin and the aircraft will be the same
B) The maximum cabin altitude of a pressurized aircraft should not normally exceed 12,500 feet ASL
What is the purpose of a safety out flow valve on an aircraft pressurization system?
A) To prevent too low a cabin differential pressure from being reached
B) To vent cabin air overboard when cabin altitude is reached
C) To prevent ambient air pressure from exceeding cabin pressure
D) To prevent excessive pressure within the pressure vessel
D) To prevent excessive pressure within the pressure vessel
The maximum ratio of cabin air pressure to ambient air pressure that a pressurization system and aircraft pressure vessel can sustain is referred to as ______.
A) max cabin altitude
B) max vessel pressure
C) max ambient pressure
D) max diff
D) max diff
With respect to aircraft pressurization systems, what is the purpose of a negative pressure relief valve?
A) To prevent the cabin differential pressure from becoming too low
B) To vent cabin air overboard when cabin altitude is reached
C) To prevent outside ambient air pressure from exceeding cabin internal pressure
D) To prevent excessive pressure within the pressure vessel
C) To prevent outside ambient air pressure from exceeding cabin internal pressure
The pilot of a small turbojet aircraft cruising at FL330 wishes to descend and land at an airport that is 2,000ft ASL. The cabin altitude of the aircraft is 7,000ft ASL. If the jet descends at a rate of 2,500ft per minute, what rate of descent should the pilot set on the cabin rate selector to affect a cabin differential pressure of zero on landing?
A) 500 ft./min
B) 400 ft./min
C) 300 ft./min
D) 200 ft./min
B) 400 ft./min
A battery temperature overheat warning on the cockpit advisory panel could be an indication of a:
A) low battery voltage
B) high battery voltage
C) battery thermal runaway
D) ground power failure causing batter depletion
C) battery thermal runaway
What functions do Transformer Rectifier Units (TRUs) and Inverters (INVs) perform on aircraft electrical system?
A) TRU’s are employed to convert DC to AC and INV’s are employed to convert AC to DC
B) TRU’s are employed to convert AC to DC and INV’s are employed to convert DC to AC
C) TRU’s provide automatic bus fault protection on an aircraft DC system and INV’s provide automatic overload protection on an aircraft AC system
D) TRU’s are employed as voltage regulators in AC systems and INV’s are employed as voltage regulators of DC system
B) TRU’s are employed to convert AC to DC and INV’s are employed to convert DC to AC
An aircraft’s electrical bus bar system can best be described as:
A) a carefully organized bunch of separate but interconnected circuits which allow important circuits to be isolated or powered by alternate sources in the event of component failure
B) multifunctional devices which provide voltage regulation, generator current direction, circuit and generator protection
C) a system of electrical circuits used to control power fluctuations or surges
D) a passive system which transfers electrical power between AC and DC powered systems depending on system demand
A) a carefully organized bunch of separate but interconnected circuits which allow important circuits to be isolated or powered by alternate sources in the event of component failure
Aircraft electrical circuit protection is provided by which of the following devices
- TRU
- GCU
- AC GEN
- INV
- CB
- AC and DC EMER BUS
A) 1,2,6
B) 1,3,5
C) 2,5
D) 2,3,6
C) 2,5
Many large turbine aircraft employ jet pumps to draw fuel into collector lines in order to ensure the high pressure fuel pump has enough fuel to supply the engine. There jet pumps are activated by:
A) high pressure fuel from the high pressure fuel pump
B) electrical boost pumps located in the fuel tanks
C) the hydromechanical fuel control unit
D) direct drive from the engine accessory section
A) high pressure fuel from the high pressure fuel pump
Which of the follow statements is false with regards to capacitance fuel measurement system?
A) It remains accurate in all phases of flight
B) The system measures volume of fuel which is then converted to weight by the FMS computer
C) Fuel measurement is achieved electrically without the need for moving parts by converting a capacitance measurement to an equivalent fuel measurement
D) Depending upon the aircraft size there may be multiple fuel capacitance probes connected in parallel in each tank that assist with an average reading of fuel weight
B) The system measures volume of fuel which is then converted to weight by the FMS computer
Magnasticks are fuel quantity measuring devices which:
A) are located beneath the fuel caps and allow for manual measuring of fuel quantity
B) are located in the refueling panel to permit selection of the desired fuel load and automatic shut-off of the refueling valves when the desired fuel load is boarded
C) are located beneath the wings and allow for manual measuring of fuel quantity
D) are located within the fuel tanks and transmit accurate quantity measurements to the fuel quantity gauges in the cockpit
C) are located beneath the wings and allow for manual measuring of fuel quantity
What function(s) are performed by an accumulator on an aircraft hydraulic system?
A) To prevent fluid flow in the event of a serious system leak
B) To absorb power fluctuations or surges in the system during high system demands and store system pressure to provide backup for key operations in case of pump failure
C) Diverts fluid back to the reservoir as system pressure increases beyond a prescribed elvel
D) To selectively channel hydraulic fluid to a component or components to accomplish specific tasks
B) To absorb power fluctuations or surges in the system during high system demands and store system pressure to provide backup for key operations in case of pump failure