During re fuelling the automatic shut off valves will switch off the fuel supply system when ?
Control > visibility
The diagram shown in annex represents a jet fuel system The fuel flow measurement is carried out 868 ?
The purpose of the barometric correction in a fuel controller is to ?
At reference in flight with centre tank empty and apu operating a fuel unbalance detected quantity in tank 1 < quantity in tank 2 rebalancing of two tanks 872 Possible with 'crossfee open tank pumps 'off' tank 2 pumps 'on', possible with 'crossfee open tank 2 pumps 'off', impossible because there no fuel in center tank, impossible without causing apu stop. 
One of purposes of fuel system booster pumps to be submerged in fuel To facilitate priming of pumps, to improve their efficiency, to shorten fuel lines, so minimising pressure losses, to heat fuel upstream of pump. The pumps are cooled the fuel, lubricated it. to achieve these functions pumps would not need to be submerged in fuel, action of flow through pumps would suffice. it important that pumps only pump fuel, not air. to this end ensuing pumps are submerged in fuel will keep them primed with fuel. 
The vapour lock A stoppage in a fuel feeding line caused a fuel vapour bubble, the exhaust gases obstructions caused an engine overheating, the effect of water vapour bubbles in induction manifold caused the condensation, the abnormal mixture enrichment caused a greater gasoline vaporisation in carburettor. 
The pressurising function of pressurising and dump valve in a gas turbine engine fuel system To admit fuel to nozzles only if fuel pressure high enough sufficient atomisation, to prevent fuel leakage in combustion chamber after engine shutdown, to prevent overpressure at fuel nozzles, to admit oil to fuel oil heat exchanger preventing ice crystals blocking fuel lines. a pressurising dump valve used with a duplex fuel nozzle. at a preset pressure pressurising valve opens allows fuel to flow into main manifold as well as pilot or primary manifold. the dump valve allows manifold fuel to be dumped into drains tank when engine shut down to prevent fuel boiling in manifold due to residual engine heat. Question Electrics 24 Answer 8
Fuel pumps submerged in fuel tanks of a multi engine aircraft are Centrifugal low pressure type pumps, high pressure variable swash plate pumps, centrifugal high pressure pumps, low pressure variable swash plate pumps. They are known as 'lp pump also 'booster pump (less than 3 bars 40 psi). engine driven pumps would come under engine fuel system, dividing line being made at low pressure cock or valve. Question Electrics 24 Answer 9
Which statement correct i the freezing point jet a at a lower temperature than that jet b ii the flash point jet a at a lower temperature than that jet b I incorrect, ii incorrect, i correct, ii correct, i incorrect, ii correct, i correct, ii incorrect. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures, but in practice that not a useful property of jet b (see below). jet fuel a blend of many different hydrocarbons that each have their own specific freezing point, so it not really possible to quote a freezing point temperature. the 'pour point' the term used in aviation industry to specify minimum safe temperature. anti ice additives such as 'prist' are used in jet a at cold temperatures, so that it can still be pumped without reducing fuel flow at 70°c, more than sufficient any jet aircraft. even at 10 15°c below first component to freeze (usually paraffin wax), jet fuel can still be pumped. the accepted minimum fuel temperature safe flight jet a 40°c, jet a 1 47°c, jet b 65°c. flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point. jet b has a flash point of below 0°c jet a around 38°c. a low flash point a useful property to start a jet engine in cold weather, but reduces amount of energy stored in fuel. remember that lower flash point, more 'volatile' fuel is. Question Electrics 24 Answer 10
Which statement correct i the freezing point jet a at a higher temperature than that jet b ii the flash point jet a at a higher temperature than that jet b I correct, ii correct, i correct, ii incorrect, i incorrect, ii correct, i incorrect, ii incorrect. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures, but in practice that not a useful property of jet b (see below). jet fuel a blend of many different hydrocarbons that each have their own specific freezing point, so it not really possible to quote a freezing point temperature. the 'pour point' the term used in aviation industry to specify minimum safe temperature. anti ice additives such as 'prist' are used in jet a at cold temperatures, so that it can still be pumped without reducing fuel flow at 70°c, more than sufficient any jet aircraft. even at 10 15°c below first component to freeze (usually paraffin wax), jet fuel can still be pumped. the accepted minimum fuel temperature safe flight jet a 40°c, jet a 1 47°c, jet b 65°c. flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point. jet b has a flash point of below 0°c jet a around 38°c. a low flash point a useful property to start a jet engine in cold weather, but reduces amount of energy stored in fuel. remember that lower flash point, more 'volatile' fuel is. Question Electrics 24 Answer 11
Which statement correct i the freezing point jet a at about same temperature as that jet b ii the flash point jet a at a higher temperature than that jet b I incorrect, ii correct, i correct, ii incorrect, i incorrect, ii incorrect, i correct, ii correct. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures, but in practice that not a useful property of jet b (see below). jet fuel a blend of many different hydrocarbons that each have their own specific freezing point, so it not really possible to quote a freezing point temperature. the 'pour point' the term used in aviation industry to specify minimum safe temperature. anti ice additives such as 'prist' are used in jet a at cold temperatures, so that it can still be pumped without reducing fuel flow at 70°c, more than sufficient any jet aircraft. even at 10 15°c below first component to freeze (usually paraffin wax), jet fuel can still be pumped. the accepted minimum fuel temperature safe flight jet a 40°c, jet a 1 47°c, jet b 65°c. flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point. jet b has a flash point of below 0°c jet a around 38°c. a low flash point a useful property to start a jet engine in cold weather, but reduces amount of energy stored in fuel. remember that lower flash point, more 'volatile' fuel is. Question Electrics 24 Answer 12
The fuel oil heat exchanger Cools oil heats fuel, cools oil only, cools both oil the fuel, heats fuel only. Question Electrics 24 Answer 13
Fuel gas turbine engines usually heated in order to Prevent icing up of lp filter, improve specific fuel consumption, improve atomisation at low temperature, improve thermal efficiency. Question Electrics 24 Answer 14
Fuel flow information gas turbine engines Measured in line between fuel control unit the engine burners, not used on aircraft, measured at outlet of high pressure fuel pump, measured in line between booster pump the engine. Question Electrics 24 Answer 15
Which statement correct i the freezing point jet a at a lower temperature than that jet b ii the flash point jet a at a higher temperature than that jet b I incorrect, ii correct, i correct, ii incorrect, i correct, ii correct, i incorrect, ii incorrect. Jet kerosene (jet a1 or jet a), jet gasoline (jet b) aviation gasoline (avgas) are names given fuel. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures, but in practice that not a useful property of jet b. jet fuel a blend of many different hydrocarbons that each have their own specific freezing point, so it not really possible to quote a freezing point temperature. the 'pour point' the term used in aviation industry to specify minimum safe temperature. anti ice additives such as 'prist' are used in jet a at cold temperatures, so that it can still be pumped without reducing fuel flow at 70°c, more than sufficient any jet aircraft. even at 10 15°c below first component to freeze (usually paraffin wax), jet fuel can still be pumped. the accepted minimum fuel temperature safe flight jet a 40°c, jet a 1 47°c, jet b 65°c. flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point. jet b has a flash point of below 0°c jet a around 38°c. a low flash point a useful property to start a jet engine in cold weather, but reduces amount of energy stored in fuel. remember that lower flash point, more 'volatile' fuel is. Question Electrics 24 Answer 16
Which statement correct i the freezing point jet a at a lower temperature than that jet b ii the flash point jet a at about same temperature as that jet b I incorrect, ii incorrect, i correct, ii incorrect, i incorrect, ii correct, i correct, ii correct. Jet kerosene (jet a1 or jet a), jet gasoline (jet b) aviation gasoline (avgas) are names given fuel. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures, but in practice that not a useful property of jet b (see below). jet fuel a blend of many different hydrocarbons that each have their own specific freezing point, so it not really possible to quote a freezing point temperature. the 'pour point' the term used in aviation industry to specify minimum safe temperature. anti ice additives such as 'prist' are used in jet a at cold temperatures, so that it can still be pumped without reducing fuel flow at 70°c, more than sufficient any jet aircraft. even at 10 15°c below first component to freeze (usually paraffin wax), jet fuel can still be pumped. the accepted minimum fuel temperature safe flight jet a 40°c, jet a 1 47°c, jet b 65°c. flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point. jet b has a flash point of below 0°c jet a around 38°c. a low flash point a useful property to start a jet engine in cold weather, but reduces amount of energy stored in fuel. remember that lower flash point, more 'volatile' fuel is. Question Electrics 24 Answer 17
Which statement correct i the freezing point jet a at a higher temperature than that jet b ii the flash point jet a at a lower temperature than that jet b I correct, ii incorrect, i incorrect, ii incorrect, i incorrect, ii correct, i correct, ii correct. Jet kerosene (jet a1 or jet a), jet gasoline (jet b) aviation gasoline (avgas) are names given fuel. jet b has a higher napthalene content that helps prevent freezing (gelling) at low temperatures, but in practice that not a useful property of jet b. jet fuel a blend of many different hydrocarbons that each have their own specific freezing point, so it not really possible to quote a freezing point temperature. the 'pour point' the term used in aviation industry to specify minimum safe temperature. anti ice additives such as 'prist' are used in jet a at cold temperatures, so that it can still be pumped without reducing fuel flow at 70°c, more than sufficient any jet aircraft. even at 10 15°c below first component to freeze (usually paraffin wax), jet fuel can still be pumped. the accepted minimum fuel temperature safe flight jet a 40°c, jet a 1 47°c, jet b 65°c. flight crews must monitor fuel temperature to ensure that fuel does not cool to below pour point. jet b has a flash point of below 0°c jet a around 38°c. a low flash point a useful property to start a jet engine in cold weather, but reduces amount of energy stored in fuel. remember that lower flash point, more 'volatile' fuel is. Question Electrics 24 Answer 18
Specific fuel consumption a turbo prop engine can be expressed in kg per Hour per unit of shaft power, per unit of shaft power, hour per nm, hour per km. Question Electrics 24 Answer 19
The dc pump in left main tank operates automatically to provide fuel to 873 Apu when ac power not available the apu selector on, right main tank when crossfeed open, center tank right main tank when crossfeed open, left engine. Question Electrics 24 Answer 20
What the density of jet a 1.8 kg/l,.7 kg/l,.6 kg/l,.9 kg/l. Density of jet a 1 at 15 °c 0.804 kg/l. Question Electrics 24 Answer 21
What does expression 'usable fue mean The total amount of fuel that can be supplied to engine, total fuel on board at start up, total fuel remaining at any stage of flight, remaining fuel in bottom of tank when pump no longer immersed in fuel. Question Electrics 24 Answer 22
Unusable fuel Sometimes minimised the incorporation of tank sump pads, always same quantity irrespective of aircraft attitude or flight conditions, fuel contaminated condensation water, removed the drains, amount of fuel available use, but not included on fuel contents gauge. Question Electrics 24 Answer 23
In order to ensure that all fuel on board available to any engine on a multi engine aircraft it must be fitted with A cross feed, a jet pump, a tank shut off valve, a booster pumps. Question Electrics 24 Answer 24
Which statement true concerning structure and possible advantage of an integral fuel tank It built internally using aircraft structure, this saves weight space, it a separate metal container that relatively light weight, is constructed of rubber so it can be fitted into any free space within aircraft, it a separated metal container that relatively cheap to manufacture. Question Electrics 24 Answer 25
Fuel dump systems are required On all transport category aircraft where maximum take off weight significant higher than maximum landing weight, on all transport category aircraft, on all transport category aircraft with more than5seats, on aircraft with a maximum take off weight higher than 5.7 tons. Question Electrics 24 Answer 26
The ventilation system in a fuel tank Prevents low pressure or excessive overpressure in tank, can be used to drain tanks, daily checks, prevents fuel freezing during flight in icing conditions, prevents vapour locking in fuel lines. Question Electrics 24 Answer 27
The fuel tanks of aircrafts must be checked water Before first flight of day or after a long turnaround time, during refuelling, before each flight, immediately after every refuelling. Question Electrics 24 Answer 28
The functions of an lp booster pump in a gas turbine fuel system are to Avoid vapour locking prevent cavitation of hp fuel pump, avoid vapour locking increase pressure during refuelling, increase pressure during refuelling prevent cavitation of hp fuel pump, pressurise fuel dump system increase pressure during refuelling. Question Electrics 24 Answer 29
Apu fuel can be provided Any ac fuel pump supplying fuel to left fuel manifold or the left main tank dc fuel pump, dc fuel pump, left forward ac fuel pump, only ac fuel pumps in left main tank. Cqb 15 september 2011 Question Electrics 24 Answer 30
The primary input signals a hydro mechanical gas turbine engine fuel control system include N2, compressor discharge pressure, compressor inlet temperature, fuel shut off, thrust lever angle, n , n2, bypass ratio, fuel shut off, thrust lever angle, n2, bypass ratio, epr, fuel shut off, thrust lever angle, n2, turbine inlet temperature, fuel shut off, generator, thrust lever angle. fitted within hp fuel pump a 'hydro mechanical governor' which uses hydraulic pressure proportional to engine speed as its controlling parameter. this system uses n2, compressor discharge pressure, compressor inlet temperature, fuel shut off, thrust lever angle as primary input signals. Question Electrics 24 Answer 31
The primary reason venting an engine oil tank to Prevent excessive pressure in tank, prevent overflow, allow expansion of hot oil, cool oil. Question Electrics 24 Answer 32
The cross feed fuel system can be used to 1 feed any engine from any fuel tank 2 dump unusable fuel 3 adjust fuel distribution4 to transfer fuel from one tank to another located in same wingthe combination that regroups all of correct statements , 3,, 4, 2, 3, 2, 4. using crossfeed, an engine can draw fuel from a fuel tank located in opposite wing. on most multi engine airplanes, operation in crossfeed mode an emergency procedure used to extend airplane range endurance in one engine inoperative flight. there are a few models that permit crossfeed as a normal, fuel balancing technique in normal operation (fuel distribution adjustment). Question Electrics 24 Answer 33
If one of 12 cells of a lead acid battery dead battery Is unserviceable, has/ 2 less voltage, but can still be used, has/ 2 less capacity, but can still be used, has/ 2 less voltage less capacity, but can still be used. Question Electrics 24 Answer 34
When ac generators are connected in parallel reactive loads are balanced means of Energizing current, frequency, voltage, torque of constant speed drive (csd). The energising current the current that controls voltage regulator, so it will control voltage to balance reactive loads. Question Electrics 24 Answer 35
In order to produce an alternating voltage of 400 hz number of pairs of poles required in an ac generator running at 6000 rpm 4 pairs, 8 pairs,2 pairs, 24 pairs. 400 = (6000/60) x pole pairs pole pairs = 4. Question Electrics 24 Answer 36
In an ac power generation system constant speed drive csd 1 can be disconnected from engine shaft2 can be disconnected from generator3 a hydro mechanical system4 an electronic system5 can not be disconnected in flight6 can be disconnected in flightthe combination regrouping all correct statements , 3, 6, 2, 3, 4,, 4, 5,, 2, 5. The csd unit normally integral with generator therefore, disconnect between csd the engine gearbox not between csd the generator. therefore, it's only csd that can be disconnected from engine gearbox. the disconnect there the purpose of isolating a hydromechanical unit i.e. it might either be leaking oil, overheating, or causing load sharing system to do oddball things. if you operate disconnect, it will dump generator via csd i.e. rotational input from engine gearbox removed resolves oil leak/problem. Question Electrics 24 Answer 37
An inverter a Unit used to convert dc into ac, device reversing polarity of static charge, static discharger, filter against radio interference. Question Electrics 24 Answer 38
In an aircraft electrical system where ac generators are not paralleled mounted changeover relay allows Power supply to faulty ac generators busbar, connection of ac generator to its distribution busbar, connection of ground power truck to its distribution busbar, connection of auxiliary power unit (apu) to its main busbar. In an ac electrical power system where generators are not paralleled (a split busbar system) only one generator can supply a busbar at any given moment. however, one generator may supply two (or more) busbars. should a generator fail then its busbar would not be powered. the changeover relays allow a different generator to supply that busbar, in addition to its own. Question Electrics 24 Answer 39
Pulling fire shutoff handle causes a number of devices to disconnect in respect of ac generator it can be said that Exciter control relay the generator breaker open, generator breaker opens, exciter control relay, generator breaker the tie breaker open, exciter control relay opens. A control relay a 'magnetic switch' which can isolate a circuit, so in effect same as a 'breaker'. an 'exciter breaker' an 'exciter control relay' are in effect same thing. an exciter breaker (exciter control relay) will isolate power to voltage regulator. the generator breaker will isolate generator from bus bar. the tie breaker will isolate two different bus bars from each other, or can connect two generators to same bus bar. in most cases you will want to keep bus bars connected so that you can use all your services, so you will trip generator breaker to isolate generator from bus bar, the exciter breaker so you effectively shut down that generator. if you have 2 generators supplying same single bus bar then you will trip tie breaker to isolate generator the generator exciter breakers to isolate shut down generator. Question Electrics 24 Answer 40
On ground auxiliary power unit apu can provide 1 electricity2 air starting system3 hydraulic pressure4 air air conditioningthe combination which regroups all of correct statements , 2, 4,, 2, 3, 4, only, 2, 3, 4. The primary purpose of an aircraft apu to provide power to start main engines. turbine engines must be accelerated to a high rotational speed in order to provide sufficient air compression self sustaining operation. smaller jet engines are usually started an electric motor, while larger engines are usually started an air turbine motor. before engines are to be turned, apu started, generally a battery. once apu running, it provides power (electric or pneumatic, depending on design) to start aircraft's main engines. apus are also used to run accessories while engines are shut down. this allows cabin to be comfortable while passengers are boarding before aircraft's engines are started. electrical power used to run systems preflight checks. for information, some apus are also connected to a hydraulic pump, allowing crews to operate hydraulic equipment, but the learning objectives, apu not considered as a power source hydraulic pressure.
Exclusive rights reserved. Reproduction prohibited under penalty of prosecution.
919 Free Training Exam Other source study: Canada drone examen 24