The replenishment of an onboard oxygen bottle must be done ?
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Source: Telepilote theorique examen 37
The contents of an oxygen bottle can be ensured by the 1 weight2 pressure3 level4 volumeThe combination containing all of the correct statements is ?
The demand valve of a diluter demand type oxygen regulator in normal mode operates when the ?
A passenger oxygen mask A continuous flow mask in principle should not be used if there smoke in cabin. a full cylinder of oxygen weighs a lot more than empty one the content can also be checked reading pressure gauge. 
A smoke hood a device covering The whole head with a continuous oxygen flow. A smoke hood has continuous flow it a protective breathing equipment (pbe) >x2pjcxp m2e basilismail is this question different from question number 718? wich says that a smoke mask a mask with flow on request not continuous question 718 about a smoke mask which different from a hood a smoke mask a device covering whole face with an oxygen flow only on demand. 
Regarding chemical oxygen generator to enable oxygen to flow passenger must Firmly pull mask towards his face. A smoke hood has continuous flow it a protective breathing equipment (pbe) >x2pjcxp m2e basilismail is this question different from question number 718? wich says that a smoke mask a mask with flow on request not continuous question 718 about a smoke mask which different from a hood a smoke mask a device covering whole face with an oxygen flow only on demand. 
Fixed oxygen systems in pressurised aeroplanes are used to provide oxygen 1 in event of depressurisation 2 in event of any passenger indisposition 3 during a normal flight 4 in event of smoke or toxic fumes in cockpit the combination of corrects statements Firmly pull mask towards his face. A smoke hood has continuous flow it a protective breathing equipment (pbe) >x2pjcxp m2e basilismail is this question different from question number 718? wich says that a smoke mask a mask with flow on request not continuous question 718 about a smoke mask which different from a hood a smoke mask a device covering whole face with an oxygen flow only on demand. Question 37-8
When using an emergency oxygen mask a pilot able to Both transmit receive. A smoke hood has continuous flow it a protective breathing equipment (pbe) >x2pjcxp m2e basilismail is this question different from question number 718? wich says that a smoke mask a mask with flow on request not continuous question 718 about a smoke mask which different from a hood a smoke mask a device covering whole face with an oxygen flow only on demand. Question 37-9
A smoke mask a Mask with flow on request covers whole face. A smoke hood has continuous flow it a protective breathing equipment (pbe) >x2pjcxp m2e basilismail is this question different from question number 718? wich says that a smoke mask a mask with flow on request not continuous question 718 about a smoke mask which different from a hood a smoke mask a device covering whole face with an oxygen flow only on demand. Question 37-10
Which of these statements about chemical oxygen generators are correct or incorrect i chemical oxygen generators are used to supply cockpit oxygen system ii the oxygen supply of chemical oxygen generators once activated can be switched off I incorrect ii incorrect. A smoke hood has continuous flow it a protective breathing equipment (pbe) >x2pjcxp m2e basilismail is this question different from question number 718? wich says that a smoke mask a mask with flow on request not continuous question 718 about a smoke mask which different from a hood a smoke mask a device covering whole face with an oxygen flow only on demand. Question 37-11
Which of these statements about chemical oxygen generators are correct or incorrect i chemical oxygen generators are often used to supply passenger oxygen ii the oxygen supply of chemical oxygen generators once activated can be switched off I correct ii incorrect. Most commercial aircraft are pressurized at a maximum cabin altitude of 8000 feet where it possible to breathe normally without an oxygen mask if cabin pressurization level reaches equivalent of 14000 feet or higher on exterior or a decompression occurs above that flying level hypoxia possible compartments containing oxygen masks will open automatically either above or in front of passenger crew seats the oxygen masks will drop down in front of passenger. Question 37-12
Which of these statements about chemical oxygen generators are correct or incorrect i chemical oxygen generators are often used to supply passenger oxygen ii the oxygen supply of chemical oxygen generators once activated cannot be switched off I correct ii correct. Most commercial aircraft are pressurized at a maximum cabin altitude of 8000 feet where it possible to breathe normally without an oxygen mask if cabin pressurization level reaches equivalent of 14000 feet or higher on exterior or a decompression occurs above that flying level hypoxia possible compartments containing oxygen masks will open automatically either above or in front of passenger crew seats the oxygen masks will drop down in front of passenger. Question 37-13
Which of these statements about chemical oxygen generators are correct or incorrect i chemical oxygen generators are used to supply cockpit oxygen system ii the oxygen supply of chemical oxygen generators once activated cannot be switched off I incorrect ii correct. chemical oxygen generators are used to supply cockpit oxygen system incorrect cockpit oxygen carried in a gaseous state pressurised in cylinders to 1800 psi (greater autonomy reversible functioning possibility to regulate flow) the oxygen supply of chemical oxygen generators once activated cannot be switched off correct they use sodium chlorate iron filings the supply lasts about 15 minutes the flow can not be modulated it a continuous flow. Question 37-14
The advantages of a chemical oxygen source the passenger cabin are 1 reduced weight and volume 2 easy storage and maintenance 3 greater autonomy 4 no risk of explosion 5 reversible functioning 6 no maintenance the combination regrouping all correct statements I incorrect ii correct. chemical oxygen generators are used to supply cockpit oxygen system incorrect cockpit oxygen carried in a gaseous state pressurised in cylinders to 1800 psi (greater autonomy reversible functioning possibility to regulate flow) the oxygen supply of chemical oxygen generators once activated cannot be switched off correct they use sodium chlorate iron filings the supply lasts about 15 minutes the flow can not be modulated it a continuous flow. Question 37-15
The disadvantages of a chemical oxygen source the passenger cabin are 1 a flow which cannot be modulated 2 a heavy and bulky system 3 non reversible functioning 4 risks of explosion 5 poor autonomy the combination regrouping all correct statements I incorrect ii correct. chemical oxygen generators are used to supply cockpit oxygen system incorrect cockpit oxygen carried in a gaseous state pressurised in cylinders to 1800 psi (greater autonomy reversible functioning possibility to regulate flow) the oxygen supply of chemical oxygen generators once activated cannot be switched off correct they use sodium chlorate iron filings the supply lasts about 15 minutes the flow can not be modulated it a continuous flow. Question 37-16
The advantages of a gaseous oxygen source compared with a chemical source the passenger cabin are 1 no risk of fire and/or explosion 2 possibility to regulate flow 3 more capacity the combination that regroups all of correct statements I incorrect ii correct. chemical oxygen generators are used to supply cockpit oxygen system incorrect cockpit oxygen carried in a gaseous state pressurised in cylinders to 1800 psi (greater autonomy reversible functioning possibility to regulate flow) the oxygen supply of chemical oxygen generators once activated cannot be switched off correct they use sodium chlorate iron filings the supply lasts about 15 minutes the flow can not be modulated it a continuous flow. Question 37-17
The epr engine pressure ratio computed Dividing turbine discharge pressure compressor inlet pressure. it engine thrust in term of epr. Question 37-18
A thermocouple type thermometer consists of Two metal conductors of different type connected at two points. it engine thrust in term of epr. Question 37-19
One of disadvantages of an electronic tachometer the Necessity of a power supply. it engine thrust in term of epr. Question 37-20
The principle of capacity gauges based on capacitance variation of A capacitor with type of dielectric. a capacitance type fuel gauge system consists of a variable capacitor located in fuel tank an amplifier an indicator the complete circuit forms an electrical bridge which continuously being rebalanced as a result of differences between capacitances of tank capacitor a reference capacitor the signal produced due to differences in signals amplified to operate a motor the motor then drives pointer to indicate capacitance change of tank capacitor thus change in fuel quantity indicated we have seen basic construction of this system now let us discuss how electrical capacitance principle utilized the capacitance type fuel gauge system in aircraft the capacitors which are to be installed in fuel tanks the fuel quantity measurement must be different in construction from those normally employed in electrical equipment the plates of capacitors take form of two tubes mounted concentrically with a narrow air space between them these plates extend full depth of a fuel tank capacitance depends on some factors which are area of plates distance between two plates the dielectric constant of material between two plates of capacitors now in this capacitance type fuel gauge system two factors plate area distance between plates are fixed the dielectric here the fuel in tank of aircraft the flow of a momentary current into a capacitor establishes a potential difference across its plates the dielectric i e fuel in aircraft's fuel tanks contains no free electrons so current cannot flow through it but it should be remembered that potential difference sets up a state of stress in atoms comprising it. Question 37-21
A synchroscope used on aircraft to Set several engines to same speed. On a multi engined aircraft a synchronizing system ensures propeller speeds are all same this achieved an electrical system that compares speed signals from engine mounted generators out of balance signals using one engine as a master signal are automatically corrected electrically trimming engine speeds until all signals are equal. Question 37-22
The 'bourdon tube' used to measure Set several engines to same speed. On a multi engined aircraft a synchronizing system ensures propeller speeds are all same this achieved an electrical system that compares speed signals from engine mounted generators out of balance signals using one engine as a master signal are automatically corrected electrically trimming engine speeds until all signals are equal. Question 37-23
If a manifold pressure gauge consistently registers atmospheric pressure cause probably Leak in pressure gauge line. On a multi engined aircraft a synchronizing system ensures propeller speeds are all same this achieved an electrical system that compares speed signals from engine mounted generators out of balance signals using one engine as a master signal are automatically corrected electrically trimming engine speeds until all signals are equal. Question 37-24
A manifold pressure gauge of a piston engine measures Absolute pressure in intake system near inlet valve. On a multi engined aircraft a synchronizing system ensures propeller speeds are all same this achieved an electrical system that compares speed signals from engine mounted generators out of balance signals using one engine as a master signal are automatically corrected electrically trimming engine speeds until all signals are equal. Question 37-25
In an engine vibration monitoring system a turbojet any vibration produced the engine Amplified filtered before being fed to cockpit indicator. vibrations are picked up accelerometers so you measure accelerations (piezzo electric or capacity type pickups) giving after conversion displacement / square second a first integration will give displacement speed (displacement per second) a second integration will give displacement each integration may introduce or amplify measurement errors but initial acceleration signal not practical use depending on engine type the bearing location displacement speed (usually noted in inch per second ips) used the vibration frequency filtered the cockpit indication to indicate only vibration in a frequency band corresponding to spool speed n1 n2 n3 that's why engines can have vibrations which are not related to spools rotating speed not being indicated in cockpit. Question 37-26
According to range of pressure to be measured low medium high different types of pressure sensors are used 1 bellows type2 bourdon tube type3 aneroid capsule classify following sensors order of increasing pressure which they are suitable Amplified filtered before being fed to cockpit indicator. vibrations are picked up accelerometers so you measure accelerations (piezzo electric or capacity type pickups) giving after conversion displacement / square second a first integration will give displacement speed (displacement per second) a second integration will give displacement each integration may introduce or amplify measurement errors but initial acceleration signal not practical use depending on engine type the bearing location displacement speed (usually noted in inch per second ips) used the vibration frequency filtered the cockpit indication to indicate only vibration in a frequency band corresponding to spool speed n1 n2 n3 that's why engines can have vibrations which are not related to spools rotating speed not being indicated in cockpit. Question 37-27
A vibration indicator receives a signal from different sensors accelerometers it indicates Vibration amplitude at a given frequency. vibrations are picked up accelerometers so you measure accelerations (piezzo electric or capacity type pickups) giving after conversion displacement / square second a first integration will give displacement speed (displacement per second) a second integration will give displacement each integration may introduce or amplify measurement errors but initial acceleration signal not practical use depending on engine type the bearing location displacement speed (usually noted in inch per second ips) used the vibration frequency filtered the cockpit indication to indicate only vibration in a frequency band corresponding to spool speed n1 n2 n3 that's why engines can have vibrations which are not related to spools rotating speed not being indicated in cockpit. Question 37-28
The transmitter of rpm indicator may consist of 1 a magnetic sensor supplying an induced ac voltage2 a dc generator supplying a dc voltage3 a single phase ac generator supplying an ac voltage4 a three phase ac generator supplying a three phase voltagethe combination of correct statements Vibration amplitude at a given frequency. statement 1 it refers to a permanent magnet that coupled to engine as it rotates within a 3 phase stator resulting 3 phase ac supply drives a 3 phase ac synchronous motor that rotates a drag cup around a permanent magnet the magnet rotates against a hairspring indicates rpm statement 2 it refers to a device that converts ac signals into dc that drives a dc motor the output then compared to a dc reference output the difference indicates rpm statement 3 it refers to a device that used on some jet engine aircraft to sense shaft speed of lp compressor during engine start up cycle it uses a single ac phase of a normal tachogenerator to show that shaft rotating is automatically isolated after start cycle has been successfully completed statement 4 it refers to a direct drive 3 phase ac generator that operated in conjunction with a 3 phase ac synchronous motor to indicate rpm. Question 37-29
The indication of a fuel float gauge varies with 1 pitch attitude 2 accelerations 3 fuel temperaturethe combination that regroups all of correct statements Vibration amplitude at a given frequency. in 1904 first float arm gas gauge appeared a float mounted on a hinged arm moved a mechanical pointer on gauge on outside of fuel tank to indicate fuel level idea was taken one step further when vehicles started to get better electrical systems connecting hinged float arm to a rheostat this allows an electrically operated fuel gauge to be mounted in vehicle's dashboard and that's basic operating principle that's still in use today but airplane attitude accelerations will affect accuracy of indication due to movements of fuel in tank temperature will modify volume thus indication. Question 37-30
If tanks of your aircraft only contain water capacitor gauges indicate A mass of water different from zero but inaccurate. in 1904 first float arm gas gauge appeared a float mounted on a hinged arm moved a mechanical pointer on gauge on outside of fuel tank to indicate fuel level idea was taken one step further when vehicles started to get better electrical systems connecting hinged float arm to a rheostat this allows an electrically operated fuel gauge to be mounted in vehicle's dashboard and that's basic operating principle that's still in use today but airplane attitude accelerations will affect accuracy of indication due to movements of fuel in tank temperature will modify volume thus indication. Question 37-31
The float type fuel gauges provide information on Volume whose indication varies with temperature of fuel. in 1904 first float arm gas gauge appeared a float mounted on a hinged arm moved a mechanical pointer on gauge on outside of fuel tank to indicate fuel level idea was taken one step further when vehicles started to get better electrical systems connecting hinged float arm to a rheostat this allows an electrically operated fuel gauge to be mounted in vehicle's dashboard and that's basic operating principle that's still in use today but airplane attitude accelerations will affect accuracy of indication due to movements of fuel in tank temperature will modify volume thus indication. Question 37-32
The sensors used to measure exhaust gas temperature on an aircraft equipped with gas turbine engine are Volume whose indication varies with temperature of fuel. a thermocouple type thermometer consists of two metal conductors of different type connected at two points the operating principle of a thermocouple a conductor that subject to a thermal gradient generates a voltage this voltage measured interpreted a thermocouple thermometer (millivoltmeter). Question 37-33
The measurement of turbine temperature or of tgt turbine gas temperature carried out at High pressure turbine outlet. a thermocouple type thermometer located between hp turbine lp turbine allowing measurement of turbine temperature. Question 37-34
The two main sources of information used to calculate turbojet thrust are Fan rotation speed (or n ) or epr (engine pressure ratio). a thermocouple type thermometer located between hp turbine lp turbine allowing measurement of turbine temperature. Question 37-35
The advantages of an 'electric' fuel float gauge are 1 easy construction2 independence of indications with regard to airplane attitude3 independence of indications with regard to accelerations4 independence of indications with regard to temperature variations5 independence of indications with regard to vibrationsthe combination regrouping all correct statements Fan rotation speed (or n ) or epr (engine pressure ratio). in 1904 first float arm gas gauge appeared a float mounted on a hinged arm moved a mechanical pointer on gauge on outside of fuel tank to indicate fuel level idea was taken one step further when vehicles started to get better electrical systems connecting hinged float arm to a rheostat this allows an electrically operated fuel gauge to be mounted in vehicle's dashboard and that's basic operating principle that's still in use today but airplane attitude accelerations will affect accuracy of indication due to movements of fuel in tank temperature will modify volume thus indication. Question 37-36
The disadvantages of an 'electric' fuel float gauge are 1 design complex 2 indications are influenced the airplane attitude variations 3 indications are influenced the accelerations 4 indications are influenced temperature variations 5 that an alternative current supply necessary the combination regrouping all correct statements Fan rotation speed (or n ) or epr (engine pressure ratio). in 1904 first float arm gas gauge appeared a float mounted on a hinged arm moved a mechanical pointer on gauge on outside of fuel tank to indicate fuel level idea was taken one step further when vehicles started to get better electrical systems connecting hinged float arm to a rheostat this allows an electrically operated fuel gauge to be mounted in vehicle's dashboard and that's basic operating principle that's still in use today but airplane attitude accelerations will affect accuracy of indication due to movements of fuel in tank temperature will modify volume thus indication. Question 37-37
On an electronic flight instrument system efis following fuel flow parameters may be displayed 1 present fuel flow of each engine2 mean fuel flow over 1 minute3 maximum admission fuel flowthe combination regrouping all correct statements Fan rotation speed (or n ) or epr (engine pressure ratio). An efis displays fuel flow to engine it displays also fuel used since last reset fuel flow usually shown in kilograms per hour. Question 37-38
The aircraft outside air temperature 'probe' measures 'tota air temperature minus kinetic heating effects in order to obtain static temperature. this question has been seen in july 2022 with this correct answer total air temperature this must be corrected ram rise recovery factor to obtain static air temperature the other wrong answers remain unchanged. Question 37-39
A millivoltmeter measuring electromotive force between 'hot junction' and 'cold junction' of a thermocouple can be directly graduated in temperature values provided that temperature of Cold junction maintained constant. this question has been seen in july 2022 with this correct answer total air temperature this must be corrected ram rise recovery factor to obtain static air temperature the other wrong answers remain unchanged. Question 37-40
The gauge indicating quantity of fuel measured a capacity gauging system can be graduated directly in weight units because dielectric constant of fuel Twice that of air varies directly with density. the dielectric constant (or permittivity) of fuel determined establishing ratio of electrical capacitance of a tank filled with fuel as compared with electrical capacitance of tank when filled with air measurements of dielectric constant of a fuel at various temperatures show that dielectric constant a linear function of temperature decreasing with increasing temperature varying with applied frequency dielectric of air (at 70°f) = 0 85 dielectric of jet fuel (at 70°f) = 1 7.
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