Câu 1: The maximum storage period is up to 3 years with inhibiting checks every?

• a) 6 months.
• b) 12 months.
• c) 24 months.

Câu 2: With increasing altitudes

• a) The ambient pressure decreases and the temperature decreases
• b) The ambient pressure decreases and the temperature increases
• c) The ambient pressure increases and the temperature decreases

Câu 3: What does fuel manifold construction to prevent fuel leak

• a) There only have double sealed connections.
• b) There are shrouded connections and single sealed connections.
• c) There are shrouded connections and double sealed connections.

Câu 4: What bearing is used to take axial loads on a main rotation shaft of a gas turbine engine?

• a) Plain bearing.
• b) Roller bearing.
• c) Ball bearing.

Câu 5: Which of the ignition system in aft burner engine has NOT the igniter plug?

• a) Catalytic ignition
• b) Spark ignition
• c) Hot shot ignition.

Câu 6: To avoid the jamming of the translating sleeve, the reverser system use:

• a) A directional control valve.
• b) A the synchronize control valve.
• c) The flexible drive shafts.

Câu 7: The propeller governor consists of?

• a) A flyweight, a pilot valve, a speeder spring and two gear pumps.
• b) Flyweights, a pilot valve, a speeder spring and a gear pump.
• c) Flyweights, a pilot valve, two speeder springs and three gear pumps.

Câu 8: The engine anti −ice valves you can lock

• a) In the opened position only
• b) In the closed position only
• c) In the closed or opened position

Câu 9: One mean of Overspeed Protection?

• a) Increasing the fuel flow to the engine combustor
• b) Decreasing the fuel flow to the engine combustor
• c) Shutoff the fuel flow to the engine combustor

Câu 10: The propeller control lever is also called?

• a) Speed lever only.
• b) Condition lever only.
• c) Speed lever or Condition lever.

Câu 11: The oil pressure is maintained constance by

• a) A pressure regulating valve
• b) Check valve
• c) Bleed valve

Câu 12: Which component control propeller speed in normal operating mode?

• a) Prop governor
• b) Control handle
• c) Fuel control unit

Câu 13: An air fuel mixture burns best at

• a) A ratio of 15:1
• b) A ratio of 7.5:1
• c) A ratio of 24:1

Câu 14: How many type of synthetic oil?

• a) 3
• b) 2
• c) 4

Câu 15: The phase position of the slave propeller is?

• a) Always the same with the master propeller.
• b) Some degrees off that of the master propeller.
• c) Not synchronized the master propeller.

Câu 16: The accessory gearbox of a high bypass engine is.

• a) On the HP Compressor housing.
• b) In the forward bearing housing.
• c) Attached to the turbine casing.

Câu 17: The wing anti−ice valves

• a) Close automatically when the aircraft lands.
• b) Open when the wing anti−ice pushbutton pushed ON anytime.
• c) Fail safe at open position.

Câu 18: How many main methods are used for icing protection?

• a) 2
• b) 3
• c) 4

Câu 19: What is main purpose of the compressor of the power section?

• a) Provide the air for the bleed system
• b) Provide the air for the combustion
• c) Drive gearbox

Câu 20: One of Overspeed Protection Principle?

• a) Increase drag of the propeller
• b) Decrease drag of the propeller
• c) Lock the blades from rotation

Câu 21: Electrical thrust control systems use?

• a) Electrical signals to transmit the thrust demand signal from the thrust control levers in the cockpit to the engines.
• b) Electrical signals to transmit the thrust demand signal from the start control levers in the cockpit to the engines.
• c) Mechanical signals to transmit the thrust demand signal from the thrust control levers in the cockpit to the engines.

Câu 22: What type of mixture water can be used in engine water injection system?

• a) Water fuel mixture.
• b) Water methanol mixture.
• c) Water ethanol mixture.

Câu 23: When inspecting a composite blade, this has to be checked?

• a) In the same way as all other composite structures.
• b) In the same way as all other metal structures.
• c) Follow the special procedure.

Câu 24: Combustion chamber flame temperature is in the order of.

• a) 2000°Centigrade.
• b) 2000°Fahrenheit.
• c) 2000°K.

Câu 25: Afterburning engine will accelerate the airflow of:

• a) The primary airstreams.
• b) Secondary airstreams.
• c) Both the primary and secondary airstreams.

Câu 26: Purpose of the clearance control system?

• a) Protects the engine compressors against stall and surge in all operating conditions and it increases their efficiency.
• b) Optimizes the tip clearance between the rotor blades and the stator casing to increase the engine efficiency.
• c) Makes sure that the internal and external engine components are cooled sufficiently during operation and after engine shut down.

Câu 27: The supply pump is driven by?

• a) The N1 rotor system
• b) The supply pump is driven by the N2 rotor system via the gearbox
• c) The supply pump is driven by the N1 rotor system via the gearbox

Câu 28: There are 2 methods to deactivate hydraulically operated thrust reversers are:

• a) Mechanically lock the movable reverser components, or shut−off the hydraulic supply to the reverser actuators by a manually operated shut−off valve.
• b) Mechanically lock the movable reverser components, or disconnect the electrical connector at the solenoid of the directional pilot valve.
• c) Disconnect the electrical connector at the solenoid of the directional pilot valve, or shut−off the hydraulic supply to the reverser actuators by a manually operated shut−off valve.

Câu 29: If the control valve, as in the Dowdy propeller of the Fokker 50, is mounted behind the gearbox in the PCU, the propeller shaft must have?

• a) One oil transfer tube.
• b) Two oil transfer tubes.
• c) Three oil transfer tubes.

Câu 30: The synchronizer calculates the propeller revolutions with the aid of inductive RPM sensors on?

• a) The propeller shafts.
• b) Blade tip.
• c) Blade root.

Câu 31: Where is over-running clutch?

• a) Located somewhere inside the engine
• b) Located somewhere between the engine and the main rotor shaft
• c) Located somewhere over the main rotor shaft

Câu 32: When the synchronizer system is switched off, the actuator of the slave engine is automatically set to?

• a) The extent position.
• b) The central position.
• c) The retract position.

Câu 33: What is purpose of air intake flap diverter?

• a) Makes sure that fluids, which creep along the fuselage, enter the APU air intake.
• b) Makes sure that fuel cannot enter the APU to prevent fire occur.
• c) Makes sure that fluids, which creep along the fuselage, cannot enter the APU air intake.

Câu 34: What is main purpose of the air intake flap diverter?

• a) Increases the APU ram air into the air intake
• b) Decreases the APU ram air into the air intake
• c) Block air from go into air intake in case of fire

Câu 35: The reverse thrust lever has?

• a) 2 main positions.
• b) 3 main positions.
• c) 4 main positions.

Câu 36: The variable stator vanes control the incoming airflow into?

• a) The LP compressor.
• b) The HP compressor.
• c) The HP turbine.

Câu 37: What are main tasks of the engine fuel distribution subsystem?

• a) Supply fuel to the engines
• b) Pressurize fuel sufficiently for vaporizing in combustion chamber
• c) Heat fuel for anti icing, supply fuel to the engines, pressurize fuel sufficiently for vaporizing in combustion chamber

Câu 38: what is component using for measuring the actual fuel flow and transmits signals to the cockpit for the fuel flow and fuel used indication.

• a) Fuel regulator
• b) Fuel flow transmitter
• c) Fuel quantity probe

Câu 39: Blade Angle is:

• a) The angle between the propeller chord and the rotational plane of the propeller the blade angle
• b) The angle of attack is the angle between the profile chord line and the relative air flow towards it.
• c) The angle between the rotational plane of the propeller and the relative velocity.

Câu 40: In Principles of Jet Propulsion, to accelerate air, the air pressure must be

• a) Decreased
• b) Increased
• c) Remain constant

Câu 41: What are the characteristics of Fixed Pitch Propeller?

• a) The blade angle (pitch) cannot be changed.
• b) The blade angle can be changed on the ground when the engine is shut down.
• c) The blade angle can be changed during operation.

Câu 42: The variable bleed valves are usually installed?

• a) In the fan frame behind the low pressure compressor.
• b) In the fan case behind the low pressure compressor.
• c) In the fan case before the low pressure compressor.

Câu 43: Which types of sensor is normally used to measure the N2 rotor speed?

• a) The tachometer generator type sensor or The inductive type sensor.
• b) The inductive type sensor or the variable reluctance type sensor.
• c) The tachometer generator type sensor or the variable reluctance type sensor.

Câu 44: The clearance control valves are normally controlled by the engine control unit and actuated by

• a) Electric motor control valves.
• b) Pneumatic pressures from PS3 station.
• c) Fuel pressure from the engine fuel system

Câu 45: On most modern gas turbine engines, a combination of all 3 cooling methods of convection, impingement and film cooling is used on?

• a) The first stage nozzle guide vanes and the first stage rotor blades
• b) The first stage nozzle guide vanes and The second stage nozzle guide vanes.
• c) The second stage rotor blades and the second stage nozzle guide vanes.

Câu 46: What are functions of ECU?

• a) It performs full power management and gives optimum thrust control for all operating conditions
• b) It performs full power management and gives minimum thrust control for all operating conditions
• c) It performs full power management and gives maximum thrust control for all operating conditions

Câu 47: The used of bleed valves to avoid engine stall and surge.

• a) In the mid section and sometimes in the aft section of the engine compressor
• b) In the mid section and sometimes in the aft section of the engine turbine
• c) In the mid section and sometimes in the forward section of the engine compressor

Câu 48: How many mode APU operate?

• a) 1
• b) 2
• c) 3

Câu 49: Where does prop governor get signal to control propeller speed in Twin Lever Control engine?

• a) Condition lever
• b) Power lever
• c) Condition lever and Power lever

Câu 50: Which types of sensor is normally used to measure the N1 rotor speed?

• a) The tachometer generator type sensor
• b) The variable reluctance type sensor.
• c) The inductive type sensor.

Câu 51: How does ECU perform fuel metering?

• a) ECU use N1 performs all the fuel metering and constant thrust control
• b) Hardware in the ECU performs all the fuel metering and constant thrust control
• c) Software in the ECU performs all the fuel metering and constant thrust control

Câu 52: The fans of turbofan engine are always driven by

• a) A turbine via two drive shafts
• b) A compressor via a drive shaft
• c) A turbine via a drive shaft

Câu 53: The pressure switch is connected to

• a) The pressure switch is also connected to the oil return line.
• b) The pressure switch is also connected to the oil drain line and the oil tank vent line
• c) The pressure switch is also connected to the oil supply line and the oil tank vent line

Câu 54: The static loads are superimposing at?

• a) The blade root.
• b) The blade tip.
• c) The mid blade.

Câu 55: Which two elements make up the axial flow compressor assembly?

• a) Rotor and stator.
• b) Stator and diffuser.
• c) Compressor and manifold.

Câu 56: In the electrical de−icing systems, Control components in the system switch the heating element segments?

• a) Alternately on and off.
• b) Continuously on.
• c) Continuously off.

Câu 57: What is statement correct?

• a) Low pressure filters usually have disposable paper filter elements, and high pressure filters have cleanable wire mesh filter elements.
• b) High pressure filters usually have disposable paper filter elements, and low pressure filters have cleanable wire mesh filter elements.
• c) Low and high pressure filters usually have disposable paper filter elements.

Câu 58: The advantage of the variable stator vanes

• a) Optimum velocity of airflow on the following rotor blades
• b) Optimum angle of attack on the following rotor blades
• c) Optimum pressure of airflow on the following rotor blades

Câu 59: The low RPM stop within the propeller is often set by?

• a) The manufacturer at a higher value.
• b) The manufacturer at a lower value.
• c) The aircraft technician, so that maximum take−off RPM can be reached if the aircraft is stationary.

Câu 60: As the geometry of the blade changes from the root to the tip, details on chord length, chord thickness and blade angle refer to a particular reference station. This reference station is normally located from?

• a) 0.5R - 0.7R.
• b) 0.7R - 0.75R.
• c) 0.75R - 0.9R.

Câu 61: The propeller should be?

• a) Kept in the original manufacturers packing but if the original packing is not available it should be wrapped in plastic material.
• b) Not kept in the original manufacturers packing.
• c) Kept in the original manufacturers packing but if the original packing is not available it should be wrapped in waxed paper.

Câu 62: A flat rated engine gives a constant thrust at

• a) All ambient conditions below this flat rate temperature.
• b) All ambient conditions above this flat rate temperature.
• c) All ambient conditions

Câu 63: Negative torque can occur if?

• a) The engine suddenly loses power on ground.
• b) Gusts hit the propeller and the force of air drives the propeller lower than the engine can do it.
• c) The engine suddenly loses power in flight or gusts hit the propeller and the force of air drives the propeller faster than the engine can do it.

Câu 64: The term thrust specific fuel consumption (TSFC) is

• a) The amount of fuel which an engine used at 100% speed for 1hour.
• b) The amount of fuel which an engine used at idle speed for 1hour.
• c) The amount of fuel which an engine needs to make 1kN of thrust for 1hour.

Câu 65: Common tasks of the internal air system are?

• a) Thrust balancing and internal cooling.
• b) Internal sealing, vibration balancing and internal cooling.
• c) Internal sealing, pressure balancing and internal cooling.

Câu 66: The centrifugal force of the propeller blade mass produces a pitch change moment which turns the blade in the direction of?

• a) High pitch.
• b) Fine pitch.
• c) Reverse.

Câu 67: The ignition exciter?

• a) Generates a very high voltage.
• b) Produces the sparks from the high voltage.
• c) Transports the electrical energy from the ignition exciter to the igniter plug and last but not least.

Câu 68: Which methods of cooling the air that passes through the core engine can be used?

• a) Engine with water sprayed system
• b) Engine with fan air cooling system.
• c) Engine with fluid cooling system.

Câu 69: The flame tube is cooled by:

• a) The primary airflow
• b) The secondary airflow
• c) Cooling air system.

Câu 70: What is the most type pump using for oil system?

• a) Piston pump
• b) Gear pump
• c) Centrifugal pump

Câu 71: Information on permissible repairs can be found in?

• a) The manufacturer’s manuals.
• b) The operator’s manuals.
• c) The mechanic handbook.

Câu 72: The subsystems of the compressor control system include:

• a) The LP compressor bleed valve system and the HP compressor bleed valve system.
• b) The variable stator vane system, the LP compressor bleed valve system.
• c) The variable bleed valve system, the variable stator vane system, the HP compressor bleed valve system.

Câu 73: On engines with a FAC system and an electronic propeller control system

• a) There is electrical shutoff module to control overspeed condition
• b) There is no mechanical over-speed governor
• c) There is still a mechanical over-speed governor used as a back-up

Câu 74: What control power of helicopter engine?

• a) Hand throttle (twist grip) built into the side collective stick
• b) Power knob via control cable
• c) Throttle pedal on the floor

Câu 75: The airflow that comes from the compressor is decreased by:

• a) The diffuser, the restrictors and by swirl vanes
• b) The diffuser, the restrictors and by guide vanes
• c) The diffuser, the restrictors and by supply ducts.

Câu 76: The non-rotating axial-flow compressor airfoils in an aircraft gas turbine are known as.

• a) Stator vanes.
• b) Bleed vanes.
• c) Pressurization vanes.

Câu 77: How many main environmental parameters that cause a change in the thrusts of a jet engine

• a) 4
• b) 3
• c) 5

Câu 78: The main positions of the forward thrust levers are?

• a) Idle and take−off thrust.
• b) Idle, take−off thrust, reverse idle.
• c) Idle, take−off thrust, reverse idle and full reverse thrust.

Câu 79: On engine speed indication, the red line shows on N1 indication it mean:

• a) The reference of speed N1 target.
• b) The speed N1 limit.
• c) The exceedance of speed N1 before.

Câu 80: What happen when angle of attack of all rotor blades increase?

• a) The rotor assembly will tend to slow
• b) The rotor assembly will tend to fast
• c) The rotor assembly will remain speed

Câu 81: Turboprop engines do not use on large A/C due to

• a) This engine is very loud
• b) This engine is not efficient
• c) It's hard to manage the rotation speed of propeller

Câu 82: The FAC calculates a variable stator vane (VSV) demand signal based on

• a) The actual engine speed and compressor inlet temperature.
• b) The actual engine speed and compressor inlet pressure.
• c) The compressor inlet temperature and pressure.

Câu 83: In convergent exhaust nozzles, the maximum airflow at pressure ratios should be below of

• a) Approximately 2:1
• b) Approximately 3:1
• c) Approximately 1:1

Câu 84: The term Pt5 means.

• a) The total pressure at station No.5.
• b) Pressure and temperature at station No.5.
• c) The total inlet pressure outlet No.5

Câu 85: What are the characteristics of Variable Pitch Propeller?

• a) The blade angle (pitch) cannot be changed.
• b) The blade angle can be changed when the engine is shut down only.
• c) The blade angle can be changed during operation.

Câu 86: The propeller is connected to the propeller shaft by?

• a) The hub.
• b) The root.
• c) The tip.

Câu 87: What is purpose over-running clutches?

• a) Disengage to free turn in case of flame out
• b) Engage to lock shaft in case of overspeed
• c) Allow for autorotation in case of power loss

Câu 88: What kind of bearing seal?

• a) Labyrinth seal, dynamic seal
• b) Carbon seal, labyrinth seal
• c) Carbon seal, dynamic seal

Câu 89: The fuel air mixture is burned in the combustion chamber

• a) The temperature, the volume of the air increases and the air pressure stays almost constant.
• b) The pressure, the volume and the temperature of the air increases
• c) The temperature, the pressure of the air increases and the volume stays almost constant.

Câu 90: Turbine clearance control systems use cooling air that is blown on or into?

• a) The turbine stator cases.
• b) The turbine rotors.
• c) The turbine stator blades.

Câu 91: The engine cooling system can be divided into?

• a) The external cooling system only.
• b) The internal air system only.
• c) The external cooling system and the internal air system.

Câu 92: The compression ratio of an axial flow compressor is a function of the.

• a) Number of compressor stages.
• b) Air inlet velocity.
• c) Rotor diameter.

Câu 93: Bernoulli's Theorem states that at any point in a flow of gas.

• a) The static pressure and dynamic pressure are equal.
• b) The static pressure is less than the dynamic pressure.
• c) The total energy remains constant.

Câu 94: First action of Overspeed Protection?

• a) Shutdown the engine
• b) Move the blades into a more coarse position
• c) Lock the blades from rotation

Câu 95: The mainly airflow which comes from the compressor to combustion is

• a) The primary airflow,
• b) The secondary airflow.
• c) The burned airflow.

Câu 96: To enable thrust to be reduced on the ground even further, turboprop engines have a second control mode called?

• a) The Alpha mode.
• b) The Reverse mode.
• c) The Beta mode.

Câu 97: How does power lever control engine power?

• a) Giving signal to the engine power module
• b) Giving signal to the engine power module and engine fuel control unit
• c) Giving signals to the engine fuel control unit.

Câu 98: If no propeller slippage in the air, effective pitch is: (Level 2)

• a) more than geometric pitch
• b) equal to geometric pitch
• c) less than geometric pitch

Câu 99: The main purpose of the starting system is?

• a) To crank the engine for maintenance checks.
• b) To create the necessary conditions which are needed to start combustion in the combustion chamber.
• c) To create the necessary conditions which are needed to start combustion in the combustion chamber or crank the engine for maintenance checks.

Câu 100: The core compartment is usually cooled and ventilated by?

• a) Fan air.
• b) Compressor air.
• c) Turbine air.

Câu 101: Which pressure does propeller use for constant-speed propeller of Hamilton Sundstrand Propellers? (Level 2)

• a) Oil pressure by engine oil pump
• b) Hydraulic pressure by engine driven pump
• c) Fuel pressure by fuel pump

Câu 102: What happen when raise collective stick?

• a) Decrease engine power
• b) Angle of attack of all rotor blades decrease at the same time
• c) Angle of attack of all rotor blades increase at the same time

Câu 103: When the sum of propeller brake moment and engine torque is zero? (Level 2)

• a) at constant rotational speed
• b) at constant forward speed
• c) at constant reverser speed

Câu 104: What is the idle speed?

• a) Midle speed is the lowest speed at which an engine operates
• b) Idle speed is the lowest speed at which an engine operates
• c) Idle speed is the high speed at which an engine operates

Câu 105: Operating synchronizing systems automatically matches the revolutions of one or several propellers to the RPM of?

• a) The master engine.
• b) The right engine.
• c) Speed of Governor shaft.

Câu 106: Which component control power in Twin Lever Control engine?

• a) Power lever
• b) Condition lever
• c) Condition lever and Power lever

Câu 107: Assembled propellers should be stored on?

• a) Racks or stands in a clean, cold environment.
• b) Racks in a clean, wet environment.
• c) Racks or stands in a clean, dry and warm environment.

Câu 108: How is the pneumatically operated reverser is latched in deploy position?

• a) By locking valve.
• b) By cam lock mechanism.
• c) By the brake in the pneumatic drive unit.

Câu 109: The equation shows that 1lb of thrust equals 1 thrust horsepower (THP) at a speed of

• a) At a speed of 175mph
• b) At a speed of 275mph
• c) At a speed of 375mph

Câu 110: Which of the ignition system in afterburner engine have the igniter plugs?

• a) Catalytic ignition and hot shot ignition.
• b) Catalytic ignition and spark ignition.
• c) Spark ignition and hot shot ignition.

Câu 111: Where is The APU compartment?

• a) Bulk cargo compartment
• b) Aircraft tail section
• c) Wing to body fairing

Câu 112: The fan speed of a twin spool axial compressor engine is the same as the.

• a) Low pressure compressor.
• b) Forward turbine wheel.
• c) High pressure compressor.

Câu 113: You can lock the wing anti −ice valves

• a) In the opened position only
• b) In the closed position only
• c) In the closed or opened position

Câu 114: What is meant by a compressor stage?

• a) One rotor and one stator assembly.
• b) All rotors and stators.
• c) One rotor and one guide vane assembly.

Câu 115: The combustion case has:

• a) An outer wall, an inner wall and a diffuser.
• b) A inner liner, a outer liner and a diffuser.
• c) An outer wall, an inner wall and a guide vane.

Câu 116: Propellers are subdivided into?

• a) Fixed pitch propellers.
• b) Adjustable pitch propellers and Variable pitch propellers.
• c) Fixed pitch propellers, Adjustable pitch propellers and Variable pitch propellers.

Câu 117: The variable stator vane actuators operate by

• a) Aircraft hydraulic power.
• b) Engine fuel pressure power.
• c) Electrical motor power.

Câu 118: The main components of the hydraulically operated thrust reverser system are:

• a) The reverser control valve module and the hydraulic actuators to deploy or stow the reverser.
• b) The reverser control valve module, gearboxes, ballscrew actuators.
• c) The reverser control valve module, gearboxes and the hydraulic actuators to deploy or stow the reverser.

Câu 119: What dose synthetic oil often use?

• a) Piston engine
• b) Turbojet engine
• c) Do not use for aviation engine

Câu 120: Propellers can also be used as aerodynamic brakes by?

• a) Reversing the direction of air acceleration.
• b) Forward the direction of air acceleration.
• c) Reversing the direction of air deceleration.

Câu 121: The subsystems of the compressor are controlled by?

• a) The hydromechanical fuel control unit only.
• b) The FADEC system only.
• c) The hydromechanical fuel control unit or by the FADEC system.

Câu 122: One disadvantage of turbojet engines is

• a) Use more fuel
• b) Very loud
• c) Only use on small A/C

Câu 123: The fuel flow transmitter measures

• a) The mass flow of fuel between the fuel pump and fuel control unit.
• b) The mass flow of fuel across the fuel boost pumps.
• c) The mass flow of fuel between the fuel control unit and the fuel nozzles.

Câu 124: In the event that an engine ground run can not be carried out then?

• a) The pitch change mechanism must be exercised by unfeathering the propeller only.
• b) The pitch change mechanism must be exercised by feathering the propeller only.
• c) The pitch change mechanism must be exercised by feathering and unfeathering the propeller.

Câu 125: What is purpose of helicopter transmission?

• a) Reducing turbine shaft rotation at 35000 rpm to helicopter rotors at 300-400 rpm.
• b) Increasing turbine shaft rotation at to 35000 rpm from helicopter rotors at 300-400 rpm.
• c) Reducing helicopter rotors at 35000 rpm to turbine shaft rotation at 300-400 rpm.

Câu 126: What are kind of low pressure fuel pumps?

• a) The fuel pumps are usually impeller type pumps driven by the accessory gearbox
• b) The fuel pumps are usually gear type pumps driven by the accessory gearbox
• c) The fuel pumps are usually piston type pumps driven by the accessory gearbox

Câu 127: On modern turbofan engines the bypass ratio is between 4:1 and 9:1, that means the fan can produce more than 80% to …% of the total thrust

• a) 0.9
• b) 0.7
• c) 0.95

Câu 128: During periodic inspections the hub must be checked for?

• a) Cracks and corrosion.
• b) Nick and gouge.
• c) Dent and delamination.

Câu 129: In comparison to a jet engine, which speed does a propeller move a large mass of air at? (Level 2)

• a) at a relatively slow speed
• b) at a relatively high speed
• c) at a relatively same speed

Câu 130: Which statement is true for beta mode? (Level 2)

• a) This can only be selected in flight
• b) This can only be selected on the ground
• c) This can be selected in flight or on ground

Câu 131: The accessory units are mounted in the ways of easy removal and installation of the accessory units are:

• a) Bolted to the accessory gear box or fitted by a V−clamp.
• b) Bolted to the accessory gear box or by a QAD-ring.
• c) Fitted by a V−clamp or by a QAD-ring.

Câu 132: The thrust is generated by

• a) Pushing against the atmosphere
• b) Acceleration of airflow
• c) Acceleration of airflow and pushing against the atmosphere

Câu 133: How inlet guide vanes work?

• a) They work like modulating valve
• b) They work like shutoff valve
• c) They work like modulating and shut-off valve

Câu 134: Which statement is correct?

• a) Magnetic chip detectors are small magnets which are in contact with the supply oil. They collect particles of magnetic metal which are passing through the oil.
• b) Magnetic chip detectors are small filter which are in contact with the scavenge oil. They collect particles of magnetic metal which are passing through the oil
• c) Magnetic chip detectors are small magnets which are in contact with the scavenge oil. They collect particles of magnetic metal which are passing through the oil

Câu 135: The ring of fixed blades at the intake of an axial flow compressor are called.

• a) Inlet guide vanes.
• b) First stage stator blades.
• c) First stage diffuser blades.

Câu 136: Clearance control systems are used to optimize the tip clearances in?

• a) Turbines only.
• b) Compressors only.
• c) Turbines and compressors.

Câu 137: You can find the start bleed valve at?

• a) The mid of the LP compressor.
• b) The aft stages of the LP compressor.
• c) The mid or aft stages of the HP compressor.

Câu 138: What type of water can be used in engine water injection system?

• a) Plain water only.
• b) Water methanol mixture only.
• c) Plain water or water methanol mixture.

Câu 139: The velocity of the airflow through the compressor will be?

• a) increased
• b) Decreased
• c) Kept constantly

Câu 140: The way the propeller works is based on?

• a) The reactive principle.
• b) The drag force.
• c) The torque.

Câu 141: If the propeller is to be stored ’on the wing’ for periods in excess of 3 months then the pitch change mechanism should be?

• a) Flushed out with an any oil and then covered with waxed paper.
• b) Flushed out with an any oil and then covered with fabric.
• c) Flushed out with an inhibiting oil and then covered with waxed paper.

Câu 142: RPM range in normal operating mode?

• a) 60-90%
• b) 95-100%
• c) 70-85%

Câu 143: Speed control of the pneumatic thrust reverse system is via

• a) The speed sensor of the air motor.
• b) The overspeed mechanism of the air motor.
• c) The cam mechanism on the feedback rod.

Câu 144: What is used to aid in stabilization of high compressor airflow?

• a) Variable stator vanes and/or compressor bleed valves.
• b) Pressurization and dump valves.
• c) Stator vanes and rotor vanes.

Câu 145: What is primary purpose for turboshaft engines in aviation?

• a) Main powerplant for helicopters
• b) Main powerplant for gyroplanes
• c) Main powerplant for cargo aircraft

Câu 146: How are bearings lubricated?

• a) By greases.
• b) By engine oil system.
• c) By engine fuel system.

Câu 147: The engine air system can be divided into?

• a) 2 subsystems.
• b) 3 subsystems.
• c) 4 subsystems.

Câu 148: Skin perforated damage of composite blade?

• a) Debonding.
• b) Lightning strike, holes.
• c) Scratches.

Câu 149: Why dose JET A1 mostly use for modern turbine engine?

• a) High flash point
• b) Low freezing point
• c) A high flash point of +38° C and a low freezing point of -47° C

Câu 150: The reverse thrust levers are located at?

• a) The top of the forward thrust levers. Forward thrust and reverse thrust use the same components.
• b) The bottom of the forward thrust levers. Forward thrust and reverse thrust use the same components.
• c) The top of the forward thrust levers. Forward thrust and reverse thrust use different components.

Câu 151: For basic compressor control the main engine control (MEC) uses

• a) The core engine speed N2 and the compressor inlet pressure.
• b) The compressor outlet temperature COT and the compressor inlet temperature CIT.
• c) The core engine speed N2 and the compressor inlet temperature CIT.

Câu 152: When handling small aircraft do not pull using the outside of the propeller blades but use?

• a) The propeller spinner instead.
• b) The propeller tip instead.
• c) The propeller root instead.

Câu 153: Which are data that oil system monitors

• a) Oil pressure only
• b) Oil quantity, oil temperature, oil pressure
• c) Oil temperature only

Câu 154: To generate high energy sparks the ignition system needs the following components?

• a) The ignition exciter and electrical power supply only.
• b) The ignition leads and the control switches only.
• c) The ignition exciter, the igniter plug, the ignition leads, the electrical power supply and the control switches.

Câu 155: The primary function of the turbine

• a) Supply the torque which is necessary to drive the compressor
• b) Increases the pressure of the incoming air
• c) Increases the velocity of the incoming air

Câu 156: How many igniter plugs on each engine?

• a) One
• b) Two
• c) Three

Câu 157: Which statement is correct?

• a) The scavenge system is part of every dry sump lubrication system. It returns the oil from the bearing compartments and the gearboxes to the oil tank
• b) The scavenge system is part of every dry sump lubrication system. It supplies the oil from the bearing compartments and the gearboxes to the oil tank
• c) The scavenge system is part of every dry sump lubrication system. It drains the oil from the bearing compartments and the gearboxes to outside.

Câu 158: With a propeller working on the constant speed principle, the RPM selected by the pilot is kept constant by changing?

• a) The blade angle.
• b) Blade speed.
• c) Torque.

Câu 159: Which engine has the greatest bypass ratio?

• a) Turbofan engine
• b) Propfans engine
• c) Turbojet engine

Câu 160: If the velocity of the air at the engine inlet increases, thrust force would be

• a) Stay the same
• b) Increased
• c) Decreased

Câu 161: Axial flow and centrifugal flow compressors have their own specific advantages and disadvantages. Which following statement is NOT correct?

• a) Centrifugal flow compressors have a very high pressure rise per stage.
• b) Axial flow compressors have a good efficiency over a wide speed range.
• c) Engines with axial flow compressors cause less drag than engines with centrifugal flow compressors

Câu 162: Propellers over-speed conditions cause damage to?

• a) Blades
• b) Blades and the blade supports
• c) Blade support

Câu 163: A reduction in pitch leads to?

• a) A smaller brake moment and thus higher RPM.
• b) A larger brake moment and thus higher RPM.
• c) A larger brake moment and thus lower RPM.

Câu 164: Should the engine fail during flight, this blade position is favourable for?

• a) Windmilling.
• b) High pitch.
• c) Low pitch.

Câu 165: The fluid anti-icing system of the propeller uses?

• a) An alcohol based liquid.
• b) Electrical power.
• c) Purified water.

Câu 166: Static and dynamic imbalances are caused by?

• a) Difference of speed.
• b) Unequal mass distribution.
• c) Difference of torque.

Câu 167: The turbine blades are prevented from corrosion of sulfuric acid by

• a) Using the correct kind of jet fuel.
• b) Using the correct ratio of air fuel mix.
• c) Using the ceramic coating.

Câu 168: Which factors are NOT important for the combustion process?

• a) Minimum decrease in pressure
• b) Maximum increase of energy
• c) Minimum decrease fuel consumption

Câu 169: Range of blade angle in normal operating mode?

• a) +25 degrees to +65 degrees
• b) +14 degrees to +40 degrees
• c) +40 degrees to +60 degrees

Câu 170: The mechanical thrust control system transmits?

• a) The thrust lever input signals to the fuel control unit on the engine.
• b) The start lever input signals to the hydraulic mechanical unit on the engine.
• c) The thrust lever input signals to the hydraulic mechanical unit on the engine.

Câu 171: This design employs an external oblique shock wave in supersonic engine inlet for

• a) Increase the supersonic airflow before the normal shock occurs.
• b) Slow the supersonic airflow before the normal shock occurs.
• c) Prevent the shock occurs.

Câu 172: If the airflow is constant and you decrease the diameter of the jet nozzle

• a) The outlet velocity does not change
• b) The outlet velocity decrease
• c) The outlet velocity increase

Câu 173: What is a can-annular combustion system?

• a) One common flame tube closed in a common air casing.
• b) A set of flame tubes, each mounted in a separate air casing.
• c) A set of flame tubes, enclosed in a common air casing.

Câu 174: The variable stator vanes (VSV) schedule open or close applies for

• a) Air inlet temperature only
• b) Air inlet pressure only
• c) Air inlet temperature and pressure.

Câu 175: The propeller is driven by an engine with a performance measured in?

• a) High pressure compressor power.
• b) Low pressure compressor power.
• c) Shaft horse power or Brake horse power.

Câu 176: The starter motor operates?

• a) The engine compressor through the accessory gearbox.
• b) The engine turbine through the accessory gearbox.
• c) The engine compressor directly.

Câu 177: Possible methods are used to compensate power of engine:

• a) Increasing the airflow density
• b) Increasing the airflow temperature.
• c) Increasing the airflow pressure.

Câu 178: Which does the engine use for the active clearance control of LP turbine?

• a) Compressor bleed air
• b) The engine fan air.
• c) The ram air.

Câu 179: The purpose of propeller twist is?

• a) Coarsen the blade angle at the root.
• b) To maintain Blade Angle along the blade.
• c) To maintain Angle of Attack at the same value along the blade.

Câu 180: The main components of a centrifugal flow compressor are:

• a) The rotor, the stator and the guide vane assembly.
• b) The rotor, the stator and the compressor manifold.
• c) The impeller, the diffuser and the compressor manifold.

Câu 181: The main engine controls are?

• a) The engine start controls, the forward thrust controls and speed governor controls.
• b) The engine start controls, the forward thrust controls and the reverse thrust controls.
• c) The forward thrust controls, the reverse thrust controls, speed governor controls.

Câu 182: Which parameters are the engines used to measure the thrust?

• a) The engine pressure ratio or the RPM
• b) The engine pressure ratio or the engine burn temperature
• c) The engine fuel flow or the RPM

Câu 183: In Twin Lever Control engine, there are:

• a) 1 power lever and 1 condition lever for each engine
• b) 1 lever to control both power and speed for each engine
• c) No power lever

Câu 184: Electrical reverse thrust controls have?

• a) A reverse thrust lever, a mechanical and an electrical signal transmission, a reverser interlock system, a lever lock system and control switches.
• b) A reverse thrust lever, a mechanical and an electrical signal transmission, a reverser interlock system, two lever locks system and control switches.
• c) A reverse thrust lever, two mechanicals and an electrical signal transmission, a reverser interlock system, a lever lock system and control switches.

Câu 185: Engine with water injection system can spray water:

• a) Into the engine air intake or into the front of the combustion chamber.
• b) Into the engine air intake or into the inside of combustion chamber.
• c) Into the front of the combustion chamber or into the inside of combustion chamber.

Câu 186: How is oil viscosity change when oil temperature increases

• a) Oil viscosity decreases
• b) Oil viscosity increases
• c) Oil viscosity not change

Câu 187: How is the EPR corresponded to the engine thrust?

• a) It is a signal from EPR sensor to engine control unit.
• b) It is the ratio of the total pressure at the turbine outlet to the total pressure at the fan inlet.
• c) It is the ratio of the static pressure at the turbine outlet to the static pressure at the fan inlet.

Câu 188: In maintenance operation, the pneumatic reversers usually operate with

• a) Pneumatic pressure from aircraft pneumatic system.
• b) Pneumatic pressure from the engine’s HP compressor.
• c) Pneumatic pressure from the engine’s LP compressor.

Câu 189: The thermocouples for the EGT are

• a) Connected in parallel in order to measure the average exhaust gas temperature.
• b) Connected in serial in order to measure the average exhaust gas temperature.
• c) Directly to engine control unit in order to measure the average exhaust gas temperature.

Câu 190: Where are the magnetic chip detectors installed?

• a) On the pressure lines.
• b) On the scavenge lines.
• c) On the supply lines.

Câu 191: Which engine sections use nickel base alloys as main material

• a) Pressure compressor, combustion section, high and low pressure turbines
• b) Pressure compressor, combustion section and low pressure turbines
• c) Pressure compressor, combustion section and high pressure turbines

Câu 192: What is shaft system most turbine helicopters use to deliver power to the transmission?

• a) Long shaft system
• b) Middle shaft system
• c) Short shaft system

Câu 193: Position of power lever?

• a) Maximum, flight idle, ground idle, reverse
• b) Maximum, cruise, flight idle, ground idle, reverse
• c) Maximum, cruise, ground idle, reverse

Câu 194: What is function of relief valve of fuel filter

• a) Valve open by differential pressure to relief fuel pressure if the filter elements become clogged
• b) Valve open by differential pressure to relief fuel pressure if the filter elements become to hot
• c) Valve close by differential pressure to relief fuel pressure if the filter elements become clogged

Câu 195: Which statement is true for beta mode? (Level 2)

• a) In beta mode the blade angle is changed directly with the power levers,
• b) In beta mode the blade angle is changed directly with the condition levers
• c) In beta mode the blade angle is changed directly with the speed levers

Câu 196: Engine and Propeller Control in Propeller Governing Mode in which operation mode?

• a) Flight Operation.
• b) Take Off and Flight Operation.
• c) Ground Operation.

Câu 197: What dose mineral oil often use?

• a) Piston engine
• b) Turbojet engine
• c) Turbo fan engine

Câu 198: Due to the amount of anti−icing fluid on board, the aircraft must be constantly monitored, so the system works?

• a) Fine and a precaution is not needed.
• b) Only as a precaution and must be activated before icing begins.
• c) Only as a precaution and must be activated after icing begins.

Câu 199: There was no engine compressor before 1937 due to

• a) There was no one can invent it
• b) There was no material that was heat-resistant enough for continuous combustion.
• c) The engine without compressor has better performance

Câu 200: Blade angle at the root is?

• a) Low.
• b) High.
• c) Master blade angle.

Câu 201: Which is back-up component in overspeed protection system?

• a) Over-speed governor
• b) Temperature sensor
• c) Oil pump

Câu 202: What is statement correct?

• a) In a hydromechanical fuel control unit all the control functions are done by air pressures and mechanical components.
• b) In a hydromechanical fuel control unit all the control functions are done by fluid pressures and mechanical components.
• c) In a hydromechanical fuel control unit all the control functions are done by fluid pressures and air pressure components.

Câu 203: What indication does the pilot receive that thrust reversers have deployed?

• a) An audible warning.
• b) A sequence of lights.
• c) A feeling of rapid deceleration.

Câu 204: What is purpose of APU?

• a) Supplies pneumatic bleed air and electrical power for the different aircraft systems
• b) Supplies reverse thrust and electrical power for the different aircraft systems
• c) Supplies pneumatic bleed air and hydraulic power for the different aircraft systems

Câu 205: In the case of propellers with a feathering position, oil pressure works in the direction of?

• a) Fine pitch.
• b) High pitch.
• c) Course pitch.

Câu 206: Purpose of the compressor control system?

• a) Protects the engine compressors against stall and surge in all operating conditions and it increases their efficiency.
• b) Optimizes the tip clearance between the rotor blades and the stator casing to increase the engine efficiency.
• c) Makes sure that the internal and external engine components are cooled sufficiently during operation and after engine shut down.

Câu 207: In convection cooling method, where does the cooling air escapes during cooling the turbine blades

• a) At the leading edges and at the blade tips
• b) At the leading edges and a the trailing edges of blades.
• c) At the trailing edges and at the blade tips

Câu 208: What is main function of fuel nozzle?

• a) To heat the fuel so that it vaporizes and burns as quickly as possible.
• b) To atomize the fuel so that it vaporizes and burns as quickly as possible.
• c) To regulate the fuel pressure so that it vaporizes and burns as quickly as possible.

Câu 209: Cracks in the paint across the blade of WOON PROPELLERS are signs of flexural vibrations. Cracks through the leading edge tipping are the result. If the tipping is cracked in this way?

• a) Maintenance is not required.
• b) It must be replaced after 500 flight hours.
• c) It must be replaced immediately.

Câu 210: What type of afterburner exhaust nozzles are used?

• a) The variable−area exhaust nozzles.
• b) The divergent exhaust nozzles.
• c) The convergent exhaust nozzles.

Câu 211: The igniter plug?

• a) Generates a very high voltage.
• b) Produces the sparks from the high voltage.
• c) Transports the electrical energy from the ignition exciter to the igniter plug and last but not least.

Câu 212: A fuel metering unit with all these additional servo valves is usually called the hydromechanical unit (HMU). What does hydromechanical unit comprise?

• a) It comprise A fuel metering unit with all these additional servo valves
• b) It comprise A fuel metering unit with some sensor.
• c) It comprise A fuel transmitter and all these additional servo valves

Câu 213: How do Compressor clearance control systems work?

• a) They use cooling air on the compressor case.
• b) They do not use cooling air on the compressor case. They use warm air to heat the rotor instead.
• c) They use warm air to heat the compressor case.

Câu 214: The type of seal between the drive shaft and the gearbox is:

• a) Carbon seals
• b) Labyrinth seals.
• c) Rubber seals.

Câu 215: Which are tasks of modern jet engines oil

• a) Lubricating only
• b) Cooling only
• c) Lubricating, corrosion protection, cleaning, cooling

Câu 216: Components in TURBOPROP ENGINES

• a) Spinner, piston, cylinder, crosshead yoke, propeller
• b) Spinner, compressor, handling bleed valve, crosshead yoke, propeller
• c) Spinner, ACC valve, piston, cylinder, crosshead yoke, propeller

Câu 217: The reduction gear is used on turboprop engine for what purpose?

• a) Reduce speed of propeller
• b) Increase speed of propeller
• c) Maintain speed of propeller

Câu 218: What is main function of fuel control unit?

• a) To meter the fuel necessary for all operating conditions of the engine
• b) To meter the fuel necessary for take off operating conditions of the engine only
• c) To regulate the fuel pressure necessary for all operating conditions of the engine

Câu 219: A floating bearing is usually

• a) Plain bearing.
• b) Roller bearing.
• c) Ball bearing.

Câu 220: Which component driven by APU gearbox?

• a) The fuel pump, the oil pumps, the compressor, the AC−generator
• b) The fuel pump, the starter, the cooling fan, the AC−generator
• c) The fuel pump, the oil pumps, the cooling fan, the AC−generator

Câu 221: The forward thrust control system is used to?

• a) Accelerate, decelerate and shut down the engine.
• b) Accelerate and shut down the engine.
• c) Accelerate and decelerate the engine. It can not be used to shut down the engine.

Câu 222: Afterburning engine consists of the introduction and burning of fuel in:

• a) An area behind the high pressure turbine.
• b) An area behind the engine turbine.
• c) An area behind the main combustion chamber.

Câu 223: The primary conditions are necessary for correct and safe combustion are:

• a) The ratio of air and fuel, the airflow pressure.
• b) The ratio of air and fuel, the airflow velocity.
• c) The ratio of air and fuel. the airflow temperature.

Câu 224: The thrust lever lock system makes sure that?

• a) The forward thrust lever and the reverse thrust lever can not be activated at the same time.
• b) The forward thrust lever and the reverse thrust lever can be activated at the same time.
• c) The forward thrust lever and the reverse thrust lever can move at the same time.

Câu 225: Balancing the propeller to reduce the moment of imbalance is known as?

• a) Dynamic balancing.
• b) Static balancing.
• c) Hub balancing.

Câu 226: Because of the higher velocity of the propeller wash behind the propeller plane, its cross−section is?

• a) Reduced there.
• b) Increased there.
• c) Constant there.

Câu 227: All the internal airflow is picked up from?

• a) The primary airflow at some points of the engine compressors or turbines.
• b) The secondary airflow at some points of the engine turbines.
• c) The secondary airflow at some points of the engine compressors or turbines.

Câu 228: What is function of the APU drain system?

• a) Catch and drain fluids and leakages from critical APU areas
• b) Drain water from air intake in ground maintenance
• c) Drain APU oil in the accessory gear box.

Câu 229: What is TSO?

• a) Time since overhaul.
• b) Time since overall.
• c) Time soon overhaul

Câu 230: Why APUs with load compressors are very fuel efficient?

• a) Because the load compressors always run at low power mode.
• b) Because the load compressors can be switched off if bleed load is not required by the aircraft.
• c) Because the load compressors only use electrical power for load mode.

Câu 231: In normal operation, the pneumatic reversers usually operate with

• a) Pneumatic pressure from aircraft pneumatic system.
• b) Pneumatic pressure from the engine’s HP compressor.
• c) Pneumatic pressure from the engine’s LP compressor.

Câu 232: The engine air intake has:

• a) The shape divergent
• b) The shape convergent
• c) The shape constant.

Câu 233: Thrust force is measured in

• a) N (Newton)
• b) KN (kilo Newton)
• c) Both N and kN

Câu 234: The external efficiency of engine mainly depends on

• a) The aircraft speed and the exhaust gas pressure
• b) The aircraft speed and the exhaust gas velocity
• c) The aircraft speed and the exhaust gas temperature

Câu 235: Metal propellers are particularly prone to?

• a) Metal fatigue.
• b) Metal bending.
• c) Gouge on metal surface.

Câu 236: If the RPMs of the propellers of multiple engine aircraft deviate even only slightly from each other, this results in?

• a) Vibrations.
• b) Increasing the life span of the structure.
• c) Decreasing the noise.

Câu 237: What are the two main basic components of the turbine section in a gas turbine engine?

• a) Stator and rotor.
• b) Hot and cold.
• c) Impeller and diffuser.

Câu 238: The higher the altitude, the…of the thrust a jet engine can produce

• a) More
• b) Less
• c) Equal

Câu 239: In an on speed condition, which component of the governor does the centrifugal force acting on? (Level 2)

• a) The governor’s control lever
• b) The governor’s hub
• c) The governor’s flyweights

Câu 240: What are kind of high pressure fuel pumps?

• a) The gear type pump and the impeller type pump.
• b) The gear type pump and the piston type pump.
• c) The impeller type pump and the piston type pump.

Câu 241: Purpose of The engine cooling system?

• a) Protects the engine compressors against stall and surge in all operating conditions and it increases their efficiency.
• b) Optimizes the tip clearance between the rotor blades and the stator casing to increase the engine efficiency.
• c) Makes sure that the internal and external engine components are cooled sufficiently during operation and after engine shut down.

Câu 242: What is purpose of flexible coupling?

• a) Allows free movements between the engine(s) and the transmission.
• b) Annul movements between the engine(s) and the transmission.
• c) Allows for small movements between the engine(s) and the transmission.

Câu 243: The RPM range in alpha mode is relatively small, from:

• a) 55% to 70%.
• b) 70% to 80%.
• c) 95% to 100%.

Câu 244: What is FAC stand for?

• a) Full Authority Data Engine Control
• b) Flight Authority Digital Engine Control
• c) Full Authority Digital Engine Control

Câu 245: Why turboshaft engine’s output is measured in horsepower instead of thrust?

• a) Power output is jet stream
• b) Power output is a turning shaft
• c) Power output contains jet stream and turning shaft

Câu 246: On a four engine aircraft the angle of the reverse stream can be matched by

• a) The correct arrangement of the thrust reverser actuators.
• b) The correct arrangement of the cascade vanes in the thrust reverser cowlings.
• c) The correct troke of the thrust reverser actuators.

Câu 247: What does the engine vibration sensors measure?

• a) The radial acceleration of the rotor system.
• b) The axial acceleration of the rotor system.
• c) The axial and radial acceleration of the rotor system.

Câu 248: The position of low-pressure fuel shut−off valve is indicated by the fuel valve closed light. This light illuminates when?

• a) The valve is open and goes out when the valve is closed.
• b) The valve is in intermediate position.
• c) The valve is closed and goes out when the valve is open.

Câu 249: In Single Lever Control engine, the lever system control?

• a) Propeller speed
• b) Engine power
• c) Propeller speed and engine power

Câu 250: The highest heat to metal contact in a jet engine is the.

• a) Burner cans.
• b) Turbine inlet guide vanes.
• c) Turbine blades.

Câu 251: The flame tube of annular combustion chamber has major parts:

• a) The air supply duct, the inner liner and the outer liner.
• b) The casing, the inner liner and the outer liner.
• c) The dome, the inner liner and the outer liner.

Câu 252: The fluid anti-icing system of the propeller, a pump injects the fluid into a slinger ring on the propeller. From there it runs by?

• a) Axial force onto the grooved anti−icing rubber.
• b) Drag force onto the grooved anti−icing rubber.
• c) Centrifugal force onto the grooved anti−icing rubber.

Câu 253: What is function of oil supply line filter?

• a) To remove any foreign particles from oil before it reaches to oil nozzle
• b) To remove any fuel from oil before it reaches to oil nozzle
• c) To remove any water from oil before it reaches to oil nozzle

Câu 254: What does EIU task?

• a) The engine interface unit (EIU) receives discrete from control switches and digitizes these inputs and sends them to the HMU
• b) The engine interface unit (EIU) receives discrete from control switches and digitizes these inputs and sends them to the ECU.
• c) The engine interface unit (EIU) receives discrete from control switches and digitizes these inputs and sends them to the Fuel metering valve.

Câu 255: The engine anti −ice system also uses

• a) The hot air comes from either the pneumatic system or directly from the engine
• b) Electrical heating mats on lips skin panel.
• c) The hot air comes from directly from the engine only.