On most transport aircraft the low pressure pumps of the fuel system are ? [ Path visibility ]

Question 38-1 : Centrifugal pumps driven by an electric motor removable only after the associated tank has been emptied mechanically driven by the engine's accessory gearbox electro mechanical wobble pumps with self regulated pressure

The fuel supply system on a jet engine includes a fuel heating device upstream ?

Question 38-2 : Prevent at low fuel temperature the risk of ice formation from water contained in the fuel maintain and improve fuel heating power ease low pressure pumps work by increasing fuel fluidity prevent fuel from freezing in fuel pipes due to low temperatures at high altitude

On most transport jet aircraft the low pressure pumps of the fuel system are ?

Question 38-3 : 115 v ac 28 v ac 28 v dc 115 v dc

The pressure usually produced by the booster pumps of the fuel supply system of ?

Question 38-4 : 20 to 50 psi 5 to 10 psi 3000 to 5000 psi 300 to 500 psi

In a gas turbine engine lubrication system the oil to fuel heat exchanger ?

Question 38-5 : Oil cooling through thermal exchange with the fuel fuel cooling to prevent vapour locking interrupting the fuel supply to the nozzles automatic controlled fuel heating by engine oil to prevent icing in the fuel filter fuel heating as required whenever fuel filter clogging is detected

The fuel cross feed system ?

Question 38-6 : Allows feeding of any engine from any fuel tank is only used to feed an engine from the tank of the opposite wing is only used on the ground for fuel transfer from one tank to another is only used in flight for fuel transfer from one tank to another

The purpose of baffles in an aeroplane's integral fuel tank is to ?

Question 38-7 : Restrict the fuel movements in the tank prevent overpressure in the tank prevent the fuel from flowing in the vent lines prevent mixture of the fuel and hydraulic fluid

On a transport type aircraft the fuel tank system is vented through ?

Question 38-8 : Ram air scoops on the underside of the wing a pressure regulator in the wing tip bleed air from the engines the return lines of the fuel pumps

The types of fuel tanks used on most modern transport aircraft are ?

Question 38-9 : Integral tanks cell tanks combined fuel tanks fixed built in tanks

The pressurization of fuel tanks is maintained by ?

Question 38-10 : The fuel vent system the fuel tank drains the fuel top off unit the fuel dump system

On a jet aircraft fuel heaters are ?

Question 38-11 : Located on the engines installed in each tank installed only in the centre tank not necessary at all

The automatic fuelling shut off valve ?

Question 38-12 : Stops fuelling as soon as a certain fuel level is reached inside the tank cuts off the fuel in case of engine fire stops fuelling as soon as the fuel spills into the vent line stops fuelling as soon as a certain pressure is reached

During re fuelling the automatic shut off valves will switch off the fuel ?

Question 38-13 : The fuel has reached a predetermined volume or mass fuelling system has reached a certain pressure the surge vent tank is filled there is fire

The diagram shown in annex represents a jet fuel system the fuel flow ?

Question 38-14 : After high pressure valve item 4 in the fuel control unit item 3 after high pressure pump first stage item 2 after low pressure valve item 1

The purpose of the barometric correction in a fuel controller is to ?

Question 38-15 : Maintain the correct fuel to air mass ratio when the altitude increases maintain a constant fuel flow whatever the altitude is reduce the fuel to air mass ratio when the altitude increases increase the fuel to air mass ratio when the altitude increases

At reference in flight with centre tank empty and apu operating a fuel ?

Question 38-16 : Possible with 'crossfeed' open and tank 1 pumps 'off' and tank 2 pumps 'on' possible with 'crossfeed' open and tank 2 pumps 'off' impossible because there is no fuel in center tank impossible without causing the apu stop

One of the purposes of the fuel system booster pumps to be submerged in the ?

Question 38-17 : To facilitate the priming of the pumps to improve their efficiency to shorten the fuel lines so minimising the pressure losses to heat the fuel upstream of the pump

The vapour lock is ?

Question 38-18 : A stoppage in a fuel feeding line caused by a fuel vapour bubble the exhaust gases obstructions caused by an engine overheating the effect of the water vapour bubbles in the induction manifold caused by the condensation the abnormal mixture enrichment caused by a greater gasoline vaporisation in the carburettor

The pressurising function of the pressurising and dump valve in a gas turbine ?

Question 38-19 : To admit fuel to the nozzles only if the fuel pressure is high enough for sufficient atomisation to prevent fuel leakage in the combustion chamber after engine shutdown to prevent overpressure at the fuel nozzles to admit oil to the fuel oil heat exchanger preventing ice crystals blocking the fuel lines

Fuel pumps submerged in the fuel tanks of a multi engine aircraft are ?

Question 38-20 : Centrifugal low pressure type pumps high pressure variable swash plate pumps centrifugal high pressure pumps low pressure variable swash plate pumps

Which statement is correct .i the freezing point for jet a is at a lower ?

Question 38-21 : I is incorrect ii is incorrect i is correct ii is correct i is incorrect ii is correct i is correct ii is incorrect

Which statement is correct .i the freezing point for jet a is at a higher ?

Question 38-22 : I is correct ii is correct i is correct ii is incorrect i is incorrect ii is correct i is incorrect ii is incorrect

Which statement is correct .i the freezing point for jet a is at about the same ?

Question 38-23 : I is incorrect ii is correct i is correct ii is incorrect i is incorrect ii is incorrect i is correct ii is correct

The fuel oil heat exchanger ?

Question 38-24 : Cools the oil and heats the fuel cools the oil only cools both the oil and the fuel heats the fuel only

Fuel for gas turbine engines is usually heated in order to ?

Question 38-25 : Prevent icing up of the lp filter improve the specific fuel consumption improve atomisation at low temperature improve thermal efficiency

Fuel flow information for gas turbine engines is ?

Question 38-26 : Measured in the line between the fuel control unit and the engine burners not used on aircraft measured at the outlet of the high pressure fuel pump measured in the line between the booster pump and the engine

Which statement is correct .i the freezing point for jet a is at a lower ?

Question 38-27 : I is incorrect ii is correct i is correct ii is incorrect i is correct ii is correct i is incorrect ii is incorrect

Which statement is correct .i the freezing point for jet a is at a lower ?

Question 38-28 : I is incorrect ii is incorrect i is correct ii is incorrect i is incorrect ii is correct i is correct ii is correct

Which statement is correct .i the freezing point for jet a is at a higher ?

Question 38-29 : I is correct ii is incorrect i is incorrect ii is incorrect i is incorrect ii is correct i is correct ii is correct

Specific fuel consumption for a turbo prop engine can be expressed in kg per ?

Question 38-30 : Hour per unit of shaft power per unit of shaft power hour per nm hour per km

The dc pump in the left main tank operates automatically to provide fuel to the ?

Question 38-31 : Apu when ac power is not available and the apu selector is on right main tank when crossfeed is open center tank and right main tank when crossfeed is open left engine

What is the density of jet a 1 ?

Question 38-32 : 0 8 kg/l 0 7 kg/l 0 6 kg/l 0 9 kg/l

What does the expression 'usable fuel' mean ?

Question 38-33 : The total amount of fuel that can be supplied to the engine the total fuel on board at start up the total fuel remaining at any stage of the flight the remaining fuel in the bottom of the tank when the pump is no longer immersed in fuel

Unusable fuel is ?

Question 38-34 : Sometimes minimised by the incorporation of tank sump pads always the same quantity irrespective of aircraft attitude or flight conditions fuel contaminated by condensation water removed by the drains the amount of fuel available for use but is not included on the fuel contents gauge

In order to ensure that all fuel on board is available to any engine on a multi ?

Question 38-35 : A cross feed a jet pump a tank shut off valve a booster pumps

Which statement is true concerning the structure and possible advantage of an ?

Question 38-36 : It is built internally using the aircraft structure this saves weight and space it is a separate metal container that is relatively light weight is is constructed of rubber so it can be fitted into any free space within the aircraft it is a separated metal container that is relatively cheap to manufacture

Fuel dump systems are required ?

Question 38-37 : On all transport category aircraft where the maximum take off weight is significant higher than the maximum landing weight on all transport category aircraft on all transport category aircraft with more than 150 seats on aircraft with a maximum take off weight higher than 5 7 tons

The ventilation system in a fuel tank ?

Question 38-38 : Prevents low pressure or excessive overpressure in the tank can be used to drain the tanks for daily checks prevents fuel freezing during flight in icing conditions prevents vapour locking in the fuel lines

The fuel tanks of aircrafts must be checked for water ?

Question 38-39 : Before the first flight of the day or after a long turnaround time during refuelling before each flight immediately after every refuelling

The functions of an lp booster pump in a gas turbine fuel system are to ?

Question 38-40 : Avoid vapour locking and prevent cavitation of the hp fuel pump avoid vapour locking and increase the pressure during refuelling increase the pressure during refuelling and prevent cavitation of the hp fuel pump pressurise the fuel dump system and increase the pressure during refuelling