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Diploma > registration : A sandwich structural part ?

Question 18-1 : Consists of two thin sheets separated by a light core material always uses honeycomb as core material is a so called integral construction is unsuitable for fuel tanks

814 exemple 118 consists of two thin sheets separated by a light core material.consists of two thin sheets separated by a light core material.

To achieve control flutter damping the balance mass must be located ?

Question 18-2 : In front of the control surface hinge behind the control surface hinge directly above the control surface hinge directly below the control surface hinge

Flutter is a dangerous phenomenon encountered in flexible structures subjected to aerodynamic forces as the airspeed increases there may be a point at which the structural damping is insufficient to damp out the motions which are increasing due to aerodynamic energy being added to the airfoil this vibration can cause structural failure and therefore considering flutter characteristics is an essential part of designing an aircraft . 813.to counteract this phenomenon the control surface's cg must be as close as possible of the hinge the torsion axis exemple 122 in front of the control surface hinge.in front of the control surface hinge.

Which of these statements concerning a sandwich structural part are correct or ?

Question 18-3 : I is correct ii is incorrect i is correct ii is correct i is incorrect ii is correct i is incorrect ii is incorrect

When a wing bends upwards aileron flutter might occur if the aileron deflects ?

Question 18-4 : Downwards because the location of the aileron centre of gravity lies behind the hinge line downwards because the location of the aileron centre of gravity lies in front of the hinge line upwards because the location of the aileron centre of gravity lies behind the hinge line upwards because the location of the aileron centre of gravity lies in front of the hinge line

Flutter is a dangerous phenomenon encountered in flexible structures subjected to aerodynamic forces as the airspeed increases there may be a point at which the structural damping is insufficient to damp out the motions which are increasing due to aerodynamic energy being added to the airfoil this vibration can cause structural failure and therefore considering flutter characteristics is an essential part of designing an aircraft . 813.if the cg is aft behind of the torsional axis inertia causes the cg of the aileron to lag behind any movement of the axis caused by changes in lift this lag can cause still further changes in incidence and hence lift making the matter worse .by having the cg on or forward of the hinge the torsion axis now uses the property of inertia to counter the effect exemple 130 downwards, because the location of the aileron centre of gravity lies behind the hinge line.downwards, because the location of the aileron centre of gravity lies behind the hinge line.

Which of these statements regarding cockpit windows are correct or incorrect .i ?

Question 18-5 : I is correct ii is incorrect i is correct ii is correct i is incorrect ii is incorrect i is incorrect ii is correct

The force from a bird impact increases with the square of the speed a hot windshield is more pliable and less likely to shatter if it gets hit . 815.bird strike example on a challenger.on modern aircraft example for the boeing 737 800 and max windows l1 r1 and l2 r2 have a conductive coating on the outer pane that permits electrical heating to prevent the build up of ice and fogging .for those models of the aircraft without electric heat to window l3 and r3 cabin air is circulated around the windshield to prevent fogging of the window . 816 exemple 134 i is correct, ii is incorrect.i is correct, ii is incorrect.

Which of these statements concerning a sandwich structural part are correct or ?

Question 18-6 : I is incorrect ii is incorrect i is correct ii is correct i is incorrect ii is correct i is correct ii is incorrect

exemple 138 i is incorrect, ii is incorrect.i is incorrect, ii is incorrect.

Which of these statements regarding cockpit windows are correct or incorrect .i ?

Question 18-7 : I is incorrect ii is correct i is correct ii is correct i is incorrect ii is incorrect i is correct ii is incorrect

The force from a bird impact increases with the square of the speed a hot windshield is more pliable and less likely to shatter if it gets hit . 815.bird strike example on a challenger.on modern aircraft example for the boeing 737 800 and max windows l1 r1 and l2 r2 have a conductive coating on the outer pane that permits electrical heating to prevent the build up of ice and fogging .for those models of the aircraft without electric heat to window l3 and r3 cabin air is circulated around the windshield to prevent fogging of the window . 816 exemple 142 i is incorrect, ii is correct.i is incorrect, ii is correct.

Which of these statements about sandwich structural parts are correct or ?

Question 18-8 : I is incorrect ii is incorrect i is correct ii is correct i is incorrect ii is correct i is correct ii is incorrect

exemple 146 i is incorrect, ii is incorrect.i is incorrect, ii is incorrect.

Which of these statements regarding cockpit windows are correct or incorrect .i ?

Question 18-9 : I is incorrect ii is incorrect i is correct ii is correct i is correct ii is incorrect i is incorrect ii is correct

The force from a bird impact increases with the square of the speed a hot windshield is more pliable and less likely to shatter if it gets hit . 815.bird strike example on a challenger.on modern aircraft example for the boeing 737 800 and max windows l1 r1 and l2 r2 have a conductive coating on the outer pane that permits electrical heating to prevent the build up of ice and fogging .for those models of the aircraft without electric heat to window l3 and r3 cabin air is circulated around the windshield to prevent fogging of the window . 816 exemple 150 i is incorrect, ii is incorrect.i is incorrect, ii is incorrect.

Which of these statements regarding cockpit windows are correct or incorrect .i ?

Question 18-10 : I is correct ii is correct i is incorrect ii is correct i is incorrect ii is incorrect i is correct ii is incorrect

The force from a bird impact increases with the square of the speed a hot windshield is more pliable and less likely to shatter if it gets hit . 815.bird strike example on a challenger.on modern aircraft example for the boeing 737 800 and max windows l1 r1 and l2 r2 have a conductive coating on the outer pane that permits electrical heating to prevent the build up of ice and fogging .for those models of the aircraft without electric heat to window l3 and r3 cabin air is circulated around the windshield to prevent fogging of the window . 816 exemple 154 i is correct, ii is correct.i is correct, ii is correct.

Which of these statements about composite and metal structures are correct or ?

Question 18-11 : I is correct ii is correct i is correct ii is incorrect i is incorrect ii is correct i is incorrect ii is incorrect

exemple 158 i is correct, ii is correct.i is correct, ii is correct.

Which of these statements about composite and metal structures are correct or ?

Question 18-12 : I is incorrect ii is incorrect i is correct ii is correct i is correct ii is incorrect i is incorrect ii is correct

For a structural component with given dimensions composite materials enable a structural component's strength to be tailored to the direction of the load .composite materials enable structures with higher strength/weight ratio than metal structures exemple 162 i is incorrect, ii is incorrect.i is incorrect, ii is incorrect.

Which of these statements about composite and metal structures are correct or ?

Question 18-13 : I is correct ii is incorrect i is incorrect ii is correct i is correct ii is correct i is incorrect ii is incorrect

For a structural component with given dimensions composite materials enable a structural component's strength to be tailored to the direction of the load .composite materials enable structures with higher strength/weight ratio than metal structures exemple 166 i is correct, ii is incorrect.i is correct, ii is incorrect.

What are the three elements of the fuselage structure of a large transport ?

Question 18-14 : Skin frames stringers skin ribs formers skin spars ribs skin girders webs

exemple 170 skin, frames, stringers.skin, frames, stringers.

Which of these statements about composite and metal structures are correct or ?

Question 18-15 : I is incorrect ii is correct i is correct ii is correct i is correct ii is incorrect i is incorrect ii is incorrect

For a structural component with given dimensions composite materials enable a structural component's strength to be tailored to the direction of the load .composite materials enable structures with higher strength/weight ratio than metal structures exemple 174 i is incorrect, ii is correct.i is incorrect, ii is correct.

A sandwich type structure is often used in aircraft because of its ?

Question 18-16 : Low mass and high stiffness low mass and low stiffness ease of deformation under load high temperature resistance

exemple 178 low mass and high stiffness.low mass and high stiffness.

A wing spar typically consists of ?

Question 18-17 : A web and girders ribs and stiffeners frames and webs ribs and frames

A typical metal spar in a general aviation aircraft usually consists of a sheet aluminium spar web and girders with 'l' or 't' shaped spar caps being welded or riveted to the top and bottom of the sheet to prevent buckling under applied loads

A semi monocoque aircraft fuselage structure usually consists of ?

Question 18-18 : Skin frames stringers ribs front spar rear spar ribs spars skin frames fittings stringers

exemple 186 skin, frames ,stringers.skin, frames ,stringers.

A sandwich structural part is unsuitable for absorbing ?

Question 18-19 : Concentrated loads bending loads torsional loads shear loads

Which of these statements concerning a sandwich structural part are correct or ?

Question 18-20 : I is incorrect ii is correct i is correct ii is correct i is incorrect ii is incorrect i is correct ii is incorrect

exemple 194 i is incorrect, ii is correct.i is incorrect, ii is correct.

Which of these statements about sandwich structural parts are correct or ?

Question 18-21 : I is correct ii is incorrect i is incorrect ii is incorrect i is incorrect ii is correct i is correct ii is correct

exemple 198 i is correct, ii is incorrect.i is correct, ii is incorrect.

Which of these statements about sandwich structural parts are correct or ?

Question 18-22 : I is incorrect ii is correct i is incorrect ii is incorrect i is correct ii is correct i is correct ii is incorrect

.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 202 i is incorrect, ii is correct.i is incorrect, ii is correct.

The function of ribs in a wing is to ?

Question 18-23 : Give the wing the desired aerodynamic shape withstand the torsional loads withstand all the structural loads allow installation of fuel cells in the wing

exemple 206 give the wing the desired aerodynamic shape.give the wing the desired aerodynamic shape.

The pressurisation load on the skin of a fuselage is ?

Question 18-24 : Tension torsion bending compression

exemple 210 tension.tension.

When the wing skin is not able to carry loads the structural elements of the ?

Question 18-25 : The spars the ribs the webs the rivets

The spars are able to carry the upward resulting from the wing lift force that supports the fuselage in flight and downward whilst stationary on the ground due to the weight of the structure fuel carried in the wings and wing mounted engines if used bending moments exemple 214 the spars.the spars.

Which of these statements about the wing structure is correct ?

Question 18-26 : A torsion box is formed by wing spars ribs and wing skin reinforced by stringers a wing main spar consists of a web with stringers a semi monocoque structure consists of the skin and frames the slats are a part of the torsion box

exemple 218 a torsion box is formed by wing spars, ribs and wing skin reinforced by stringers.a torsion box is formed by wing spars, ribs and wing skin reinforced by stringers.

The purpose of bonding the metallic parts of an aircraft is to .1 prevent ?

Question 18-27 : 2 4 1 4 2 3 1 3

.bonding is the electrical interconnection of metallic aircraft parts normally at earth potential for the safe distribution of electrical charges and currents .bonding provides a means of protection against charges as a result of the build up of precipitation static and electrostatic induction as a result of lightning strikes so that the safety of the aircraft or its occupants is not endangered .bonding reduces the possibility of electric shock from the electrical supply system reduces interference with the functioning of essential services e g radio communications and navigational aids and provides a low resistance electrical return path for electric current in earth return systems exemple 222 2, 4.2, 4.

Which sequence correctly places the fuselage shapes illustrated in order of ?

Question 18-28 : 2 3 4 1 1 3 4 2 1 4 3 2 3 1 2 4

N°1 is clearly the weakest and would only be used on an unpressurised aircraft twin otter for example.n°2 is geometrically the strongest from a pressurisation point of view as the hoop stresses can be uniform on the whole cross section.n°3 'double bubble' type where two circles intersect connected via a floor not the best choice but clearly better than n°4.n°4 the pressurization constraints will not be optimal on an oval format.this question also exists with the statement 'from the following fuselage profile sort them from the worst to the best one concerning the pressurization '.answer 1 4 3 2 exemple 226 2, 3, 4, 1.2, 3, 4, 1.

Hydraulic fluids must have the following characteristics.1 thermal stability.2 ?

Question 18-29 : 1 2 3 and 4 1 2 5 and 7 2 3 4 and 5 1 3 4 and 6

exemple 230 1, 2, 3 and 4.1, 2, 3 and 4.

Hydraulic fluids ?

Question 18-30 : Are irritating to e and skin are irritating to e and skin and cause high fire risk cause high fire risk do not require special care

exemple 234 are irritating to eyes and skin.are irritating to eyes and skin.

Hydraulic fluids used in systems of large modern airliners are ?

Question 18-31 : Phosphate ester base fluids water base fluids vegetable base fluids mineral base fluids

exemple 238 phosphate ester base fluids.phosphate ester base fluids.

Hydraulic power is a function of ?

Question 18-32 : System pressure and volume flow pump rpm only system pressure and tank capacity pump size and volume flow

Large transport aeroplane hydraulic systems usually operate with a system ?

Question 18-33 : 3000 psi 4000 psi 2000 psi 1000 psi

Hydraulic system of the a380 is 5000 psi instead of 3000 psi but usually hydraulic systems operate with a system pressure of 3000 psi exemple 246 3000 psi.3000 psi.

In hydraulic systems of large modern transport category aircraft the fluids ?

Question 18-34 : Synthetic oil mineral oil water and glycol vegetable oil

exemple 250 synthetic oil.synthetic oil.

The type of hydraulic oil used in modern hydraulic systems is ?

Question 18-35 : Synthetic oil vegetable oil mixture of mineral oil and alcohol mineral oil

exemple 254 synthetic oilsynthetic oil

In a modern hydraulic system 'hydraulic fuses' can be found their function is ?

Question 18-36 : To prevent total system loss in case of a leaking hydraulic line to switch to the secondary system in case of a leak in the primary brake system to isolate a part of the system and protect it against accidental pollution to allow by passing of a hydraulic pump in case it is subject to excessive pressure without further damage to the system

In hydraulic systems a fuse is a component which prevents the sudden loss of hydraulic fluid pressure it is a safety feature designed to allow systems to continue operating or at least to not fail catastrophically in the event of a system breach it does this by stopping the flow of hydraulic fluid through itself if the flow exceeds a threshold . 819.boeing 737 hydraulic fuses .the term 'fuse' is used here in analogy with electrical fuses which perform a similar function exemple 258 to prevent total system loss in case of a leaking hydraulic line.to prevent total system loss in case of a leaking hydraulic line.

In a hydraulic system the reservoir is pressurized in order to ?

Question 18-37 : Prevent pump cavitation reduce fluid combustibility seal the system keep the hydraulic fluid at optimum temperature

Cavitation occurs when a liquid moves within tubing or pipes at very fast speeds causing the absolute pressure of the liquid to drop drastically this process occurs with little loss of heat if the absolute pressure drops below the vapour pressure of the liquid cavitation will form this phenomenon is more serious in viscous liquids than in thin liquids .cavitation causes separation of gases that are within the liquid such as air or water vapour from the liquid itself bubbles would form then collapse .in the case of a liquid entering the suction side of a pump the pressure would be low for the liquid to move from one place to another it would have to expend energy thus causing a further decrease in pressure .if you pressurize the hydraulic fluid entering in the hydraulic pump you will avoid cavitation in the pump exemple 262 prevent pump cavitation.prevent pump cavitation.

Shuttle valves will automatically ?

Question 18-38 : Switch hydraulically operated units to the most appropriate pressure supply guard systems against overpressure reduce pump loads shut down systems which are overloaded

The shuttle valve .sometimes fluid must come from more than one source to meet the demands of a complex system at other times an emergency system might be needed to provide pressure if the normal system fails the emergency system will usually only actuate essential components .the shuttle valve can isolate the normal system from an alternate or emergency one a typical shuttle valve contains three ports . normal system inlet. alternate system inlet. an outlet..inside the shuttle valve there is a sliding part predictably called the shuttle whose purpose is to seal off an inlet port which itself will contain a shuttle seat. 820..when a shuttle valve is in its normal position fluid can flow freely from the normal system inlet port to the actuating unit the shuttle is seated against the alternate system inlet port and held there by normal system pressure where it remains until the alternate system is activated fluid under pressure is then directed from the alternate system to the shuttle valve forcing the shuttle to seal off the normal inlet port fluid from the alternate system then has a free flow to the outlet port exemple 266 switch hydraulically operated units to the most appropriate pressure supply.switch hydraulically operated units to the most appropriate pressure supply.

The colour of a fresh synthetic hydraulic fluids is ?

Question 18-39 : Purple pink blue red

exemple 270 purple.purple.

The function of a hydraulic selector valve is to ?

Question 18-40 : Direct system pressure to either side of the piston of an actuator select the system to which the hydraulic pump should supply pressure automatically activate the hydraulic system discharge some hydraulic fluid if the system pressure is too high

A selector or control valve enabling the operator to select the direction of the flow of fluid to the required service and providing a return path for the oil to the reservoir . 821 exemple 274 direct system pressure to either side of the piston of an actuator.direct system pressure to either side of the piston of an actuator.

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