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Which of these statements about sandwich structural parts are correct or incorrect I A sandwich structural part consists of fibres and a resin II A sandwich structural part is not suitable for ? Experience > registration

exemple question 141
I incorrect ii correct. composite materials such as sandwich structural parts are made from fibres generally embedded in epoxy resin covered with a skin of aluminium kevlar or nomex sandwich structural parts need additional provisions to carry concentrated loads.


The function of ribs in a wing is to ?

exemple question 142
The function of ribs in a wing to Give wing desired aerodynamic shape. composite materials such as sandwich structural parts are made from fibres generally embedded in epoxy resin covered with a skin of aluminium kevlar or nomex sandwich structural parts need additional provisions to carry concentrated loads.


The pressurisation load on the skin of a fuselage is ?

exemple question 143
The pressurisation load on skin of a fuselage Give wing desired aerodynamic shape. composite materials such as sandwich structural parts are made from fibres generally embedded in epoxy resin covered with a skin of aluminium kevlar or nomex sandwich structural parts need additional provisions to carry concentrated loads.


exemple question 144
When wing skin not able to carry loads structural elements of wing which carry bending moment are Give wing desired aerodynamic shape. The spars are able to carry upward (resulting from wing lift force that supports fuselage in flight) downward (whilst stationary on ground due to weight of structure fuel carried in wings wing mounted engines if used) bending moments.


exemple question 145
Which of these statements about wing structure correct A torsion box formed wing spars ribs wing skin reinforced stringers. The spars are able to carry upward (resulting from wing lift force that supports fuselage in flight) downward (whilst stationary on ground due to weight of structure fuel carried in wings wing mounted engines if used) bending moments.


exemple question 146
The purpose of bonding metallic parts of an aircraft to 1 prevent electrolytic corrosion between mating surfaces of similar metals2 ensure zero voltage difference between aircraft components3 isolate all components electrically4 provide a single earth electrical devicesthe combination that regroups all of correct statements A torsion box formed wing spars ribs wing skin reinforced stringers. bonding the electrical interconnection of metallic aircraft parts (normally at earth potential) the safe distribution of electrical charges currents bonding provides a means of protection against charges as a result of build up of precipitation static electrostatic induction as a result of lightning strikes so that safety of aircraft or its occupants not endangered bonding reduces possibility of electric shock from electrical supply system reduces interference with functioning of essential services (e g radio communications navigational aids) provides a low resistance electrical return path electric current in earth return systems.


exemple question 147
Which sequence correctly places fuselage shapes illustrated in order of decreasing structural strength 818 A torsion box formed wing spars ribs wing skin reinforced stringers. N°1 clearly weakest would only be used on an unpressurised aircraft (twin otter example) n°2 geometrically strongest from a pressurisation point of view as hoop stresses can be uniform on whole cross section n°3 'double bubble' type where two circles intersect connected via a floor not best choice but clearly better than n°4 n°4 pressurization constraints will not be optimal on an oval format this question also exists with statement 'from following fuselage profile sort them from worst to best one concerning pressurization ' answer 1 4 3 2.


8
Hydraulic fluids must have following characteristics 1 thermal stability2 low emulsifying characteristics3 corrosion resistance4 good resistance to combustion5 high compressibility6 high volatility7 high viscositythe combination regrouping all correct statements A torsion box formed wing spars ribs wing skin reinforced stringers. N°1 clearly weakest would only be used on an unpressurised aircraft (twin otter example) n°2 geometrically strongest from a pressurisation point of view as hoop stresses can be uniform on whole cross section n°3 'double bubble' type where two circles intersect connected via a floor not best choice but clearly better than n°4 n°4 pressurization constraints will not be optimal on an oval format this question also exists with statement 'from following fuselage profile sort them from worst to best one concerning pressurization ' answer 1 4 3 2.


9
Hydraulic fluids Are irritating to eyes skin. N°1 clearly weakest would only be used on an unpressurised aircraft (twin otter example) n°2 geometrically strongest from a pressurisation point of view as hoop stresses can be uniform on whole cross section n°3 'double bubble' type where two circles intersect connected via a floor not best choice but clearly better than n°4 n°4 pressurization constraints will not be optimal on an oval format this question also exists with statement 'from following fuselage profile sort them from worst to best one concerning pressurization ' answer 1 4 3 2.


10
Hydraulic fluids used in systems of large modern airliners are Phosphate ester base fluids. N°1 clearly weakest would only be used on an unpressurised aircraft (twin otter example) n°2 geometrically strongest from a pressurisation point of view as hoop stresses can be uniform on whole cross section n°3 'double bubble' type where two circles intersect connected via a floor not best choice but clearly better than n°4 n°4 pressurization constraints will not be optimal on an oval format this question also exists with statement 'from following fuselage profile sort them from worst to best one concerning pressurization ' answer 1 4 3 2.


11
Hydraulic power a function of System pressure volume flow. N°1 clearly weakest would only be used on an unpressurised aircraft (twin otter example) n°2 geometrically strongest from a pressurisation point of view as hoop stresses can be uniform on whole cross section n°3 'double bubble' type where two circles intersect connected via a floor not best choice but clearly better than n°4 n°4 pressurization constraints will not be optimal on an oval format this question also exists with statement 'from following fuselage profile sort them from worst to best one concerning pressurization ' answer 1 4 3 2.


12
Large transport aeroplane hydraulic systems usually operate with a system pressure of approximately System pressure volume flow. Hydraulic system of a380 5000 psi instead of 3000 psi but usually hydraulic systems operate with a system pressure of 3000 psi.


13
In hydraulic systems of large modern transport category aircraft fluids used are System pressure volume flow. Hydraulic system of a380 5000 psi instead of 3000 psi but usually hydraulic systems operate with a system pressure of 3000 psi.


14
The type of hydraulic oil used in modern hydraulic systems System pressure volume flow. Hydraulic system of a380 5000 psi instead of 3000 psi but usually hydraulic systems operate with a system pressure of 3000 psi.


15
In a modern hydraulic system 'hydraulic fuse can be found their function To prevent total system loss in case of a leaking hydraulic line. In hydraulic systems a fuse a component which prevents sudden loss of hydraulic fluid pressure it a safety feature designed to allow systems to continue operating or at least to not fail catastrophically in event of a system breach it does this stopping flow of hydraulic fluid through itself if flow exceeds a threshold boeing 737 hydraulic fuses the term 'fuse' used here in analogy with electrical fuses which perform a similar function.


16
In a hydraulic system reservoir pressurized in order to Prevent pump cavitation. Cavitation occurs when a liquid moves within tubing or pipes at very fast speeds causing absolute pressure of liquid to drop drastically this process occurs with little loss of heat if absolute pressure drops below vapour pressure of liquid cavitation will form this phenomenon more serious in viscous liquids than in thin liquids cavitation causes separation of gases that are within liquid (such as air or water vapour) from liquid itself bubbles would form then collapse in case of a liquid entering suction side of a pump pressure would be low for liquid to move from one place to another it would have to expend energy thus causing a further decrease in pressure if you pressurize hydraulic fluid entering in hydraulic pump you will avoid cavitation in pump.


17
Shuttle valves will automatically Switch hydraulically operated units to most appropriate pressure supply. the shuttle valve sometimes fluid must come from more than one source to meet demands of a complex system at other times an emergency system might be needed to provide pressure if normal system fails (the emergency system will usually only actuate essential components) the shuttle valve can isolate normal system from an alternate or emergency one a typical shuttle valve contains three ports normal system inlet alternate system inlet an outlet inside shuttle valve there a sliding part predictably called shuttle whose purpose to seal off an inlet port which itself will contain a shuttle seat when a shuttle valve in its normal position fluid can flow freely from normal system inlet port to actuating unit the shuttle seated against alternate system inlet port held there normal system pressure where it remains until alternate system activated fluid under pressure then directed from alternate system to shuttle valve forcing shuttle to seal off normal inlet port fluid from alternate system then has a free flow to outlet port.


18
The colour of a fresh synthetic hydraulic fluids Switch hydraulically operated units to most appropriate pressure supply. the shuttle valve sometimes fluid must come from more than one source to meet demands of a complex system at other times an emergency system might be needed to provide pressure if normal system fails (the emergency system will usually only actuate essential components) the shuttle valve can isolate normal system from an alternate or emergency one a typical shuttle valve contains three ports normal system inlet alternate system inlet an outlet inside shuttle valve there a sliding part predictably called shuttle whose purpose to seal off an inlet port which itself will contain a shuttle seat when a shuttle valve in its normal position fluid can flow freely from normal system inlet port to actuating unit the shuttle seated against alternate system inlet port held there normal system pressure where it remains until alternate system activated fluid under pressure then directed from alternate system to shuttle valve forcing shuttle to seal off normal inlet port fluid from alternate system then has a free flow to outlet port.


19
The function of a hydraulic selector valve to Direct system pressure to either side of piston of an actuator. A selector or control valve enabling operator to select direction of flow of fluid to required service providing a return path the oil to reservoir .


20
The component that converts hydraulic pressure into linear motion called Direct system pressure to either side of piston of an actuator. The purpose if to convert fluid flow into linear or rotary motion they vary in size construction depending on operating loads but all consist of an outer cylinder in which slides a piston seal assembly attached to piston a piston rod which passes through a gland seal fitted into end of cylinder.



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