Danh sách câu hỏi

Câu 1: Which is not a suitable cooling media for titanium drilling?

a) Distilled water
b) Oil
c) Air

Câu 2: What are film adhesives used for?

a) Bonding metal to metal, sandwich core to skin and GFRP, AFRP and CFRP
b) Bonding GFRP to AFRP and CFRP
c) Bonding sandwich core to GFRP, AFRP and CFRP

Câu 3: The two main types of thermosetting resin used for composite structures are:

a) Epoxy resins and Phenolic resins
b) Thermoplastic resins and Polyester resin
c) Epoxy resins and thermoplastic resins

Câu 4: Do Titanium rivets need to be heat treated before use?

a) No
b) Yes
c) Not given

Câu 5: Why is pitting corrosion dangerous

a) Because it has no obvious signs on the surface of the metal so it is difficult to detect. In addition, the corrosion extends in the vertical direction so it reduces material strength
b) Because it has no obvious signs on the surface of the metal so it is difficult to detect. In addition, the corrosion extends in the horizontal direction so it reduces material strength
c) Because it is the most difficult type of corrosion to repair

Câu 6: Which material is used to manufacture primary structural components?

a) CFRP
b) AFRP
c) GFRP

Câu 7: After soft annealing:

a) The parts can be installed on the aircraft
b) The parts have to be quenched
c) The parts have to be heat treated again

Câu 8: The most common alloying element for titanium is?

a) Aluminum
b) Copper
c) Zinc

Câu 9: Which of the following statements is correct about Scratch damage?

a) Scratch is damage to a surface caused by scuffing, rubbing or scraping of the component. Fibres are not damaged and mechanical performance is not affected.
b) Scratch is when a separation of materials, e.g. stringer to skin, occurs due to an adhesive failure
c) Scratch is the result of contact with a sharp object and only surface fibres are affected and the edges are sharp

Câu 10: When tempering steel, the temperature is:

a) Above the GSE line
b) Below the GSE line
c) Exactly at the GSE line

Câu 11: Symbol of solid rivet 2017 Aluminium Alloy (D)?

a) They are identified by two raised dashes on their heads.
b) A small dimple in the centre of their head
c) A raised dot in the centre of their head.

Câu 12: Titanium components cannot be cleaned using:

a) MEK
b) Isopropyl Alcohol
c) Acetone

Câu 13: Which of these acids will have a reaction with titanium at room temperature?

a) Chromic acid
b) Hydrochloric acid
c) Hydrofluoric acid

Câu 14: What material principally made of lines in the engine area and in the landing gear area?

a) Aluminum
b) Steel
c) Titanium

Câu 15: Symbol of solid rivet 2024 Aluminium Alloy (DD)?

a) A raised dot in the centre of their head.
b) A small dimple in the centre of their head
c) They are identified by two raised dashes on their heads.

Câu 16: During routine aircraft maintenance, a fuel sample is usually taken for inspection. One of the purposes of this is to prevent corrosion in the fuel tank. Why?

a) Because in the fuel tank may have water and microorganisms can grow in the tank. This will cause corrosion of the fuel tank structure
b) Because the fuel in the tank can be mixed with the electrolyte solution, leading to electrochemical corrosion
c) Because the fuel in the tank can change its chemical structure, turning it into structural corrosive substances

Câu 17: A Lockbolt (pin swaged) fastener is a two-piece assembly consisting of:

a) A pin with a protruding or countersink head
b) A collar
c) A pin with a protruding or countersink head and a collar

Câu 18: Which of these aluminum are not corrosion resistant?

a) 3003 Al
b) 5056 Al
c) 7475 Al

Câu 19: Which of these steel grades is affected by hydrogen embrittlement?

a) 300M
b) AISI 4130
c) 17-4 PH

Câu 20: How many classes of metal springs have?

a) 1
b) 3
c) 2

Câu 21: Which of the following is not a chipless deformation?

a) Bending
b) Compressing
c) Shearing

Câu 22: Why do aluminum alloys get hardened after a heat treatment process?

a) The aluminum lattice structure gets distorted by precipitations formed by wandering foreign atoms inside them.
b) The aluminum lattice structure gets uniformed by precipitations formed by wandering foreign atoms inside them.
c) The aluminum lattice structure gets crystalized by precipitations formed by wandering foreign atoms inside them.

Câu 23: What is/are main function(s) of bearing?

a) Used to support the journals of shafts
b) Used to support the journals of axles
c) Used to support the journals of shafts and axles

Câu 24: The production methods of plastics include:

a) Polyester, polycondensation, polyaddition
b) Polymerisation, polyamides, polyurethanes
c) Polymerisation, polycondensation, polyaddition

Câu 25: The difference between T42 and T62 temper designation is:

a) The annealing process
b) The quenching process
c) The aging process

Câu 26: Which of the following statements is correct about Dent damage?

a) A dent is a deformity caused by extraneous forces, which are applied to the structure. This can be an impact (FOD) for example.
b) A dent is when a separation of materials, e.g. stringer to skin, occurs due to an adhesive failure
c) A dent is when the separation of plies occurs in a multi-laminate material. This can be caused by the material being hit (impact delamination), or when there is a resin failure for any other reason.

Câu 27: Which of these materials are easiest to form with?

a) 2024-W
b) 2024-F
c) 2024-O

Câu 28: A commonly-used rule of thumb for selecting the rivet size is to choose a rivet whose diameter is?

a) At least 2 times the thickness of the thickest sheet being joined.
b) At least 2.5 times the thickness of the thickest sheet being joined.
c) At least 3 times the thickness of the thickest sheet being joined.

Câu 29: Which form are the matrix and the reinforcing generally in?

a) The matrix is generally in gas form and the reinforcing material is a solid
b) The matrix is generally in liquid form and the reinforcing material is a solid
c) The matrix is generally in solid form and the reinforcing material is a liquid

Câu 30: Where is chains may be used in?

a) Control runs or in conjunction with cable assemblies
b) In conjunction with cable assemblies
c) Control runs

Câu 31: How many steps are there in the aluminum heat treatment process?

a) 2
b) 3
c) 4

Câu 32: What are the effects of the Bag Seating Tape?

a) Bag Seating Tape is used to control the temperature of the repair during the warm-up, cure and cool-down stages of the repair
b) Bag Seating Tape is used to reduce heat loss and to minimise the effects of draughts on the repair
c) Bag Seating Tape is used to seal the vacuum bag to the surface of the item under repair

Câu 33: What does CFRP mean?

a) Carbon Fibre Reinforced Plastic
b) Ceramic Fibre Reinforced Plastic
c) Composite Fibre Reinforced Plastic

Câu 34: Composite is describe as:

a) Three or more materials that are combined to form a much stronger structure than either material by itself
b) One or more materials that are combined to form a much stronger structure than either material by itself
c) Two or more materials that are combined to form a much stronger structure than either material by itself

Câu 35: Which aircraft has its whole airframe made out of composite materials?

a) Airbus A321
b) Airbus A330
c) Boeing B787

Câu 36: What is construction of hose include?

a) The inner layer, the reinforcement layer and the outer cover
b) The reinforcement layer and the outer cover
c) The inner layer and the outer cover

Câu 37: How many part of the Hi-Lok and Hi-Lite (pin threaded) fastener:

a) There are one parts: Collar with an internal thread, an external hexagonal drive and an external
b) There are one parts: Threaded pin with a head (universal or countersink)
c) There are two parts: Threaded pin with a head (universal or countersink) and collar with an internal thread, an external hexagonal drive and an external shear groove

Câu 38: Why do you need to clad aluminum alloys?

a) Alloys do not form a closed oxide skin to protect themselves.
b) Alloys do not give the same shine and glare.
c) Alloys do not have the same properties as pure aluminum.

Câu 39: Which material of spring can be used for high temperatures up to 343 degrees Celsius?

a) Alloy Steel Wire
b) Stainless Steel Wire
c) High−Temperature Alloy Wire

Câu 40: What size of the inner diameter of hoses is usually given in?

a) 1/8 inch
b) 1/16 inch
c) 1/4 inch

Câu 41: Symbol of Corrosion Resistant Steel rivets are identified on their head?

a) No mark
b) A small dimple in the centre of their head
c) A raised dot in the centre of their head.

Câu 42: Which is not an aging method for aluminum alloys?

a) Natural aging
b) Forced aging
c) Artificial aging

Câu 43: Which of the following statements is correct about Debonding damage?

a) Debonding is damage to a surface caused by scuffing, rubbing or scraping of the component. Fibres are not damaged and mechanical performance is not affected.
b) Debonding is when a separation of materials, e.g. stringer to skin, occurs due to an adhesive failure
c) Debonding is the result of contact with a sharp object and only surface fibres are affected and the edges are sharp

Câu 44: What are the characteristics of the honeycomb core material?

a) Has a rectangle shape and has a excellent strength-to-weight ratio.
b) Has a natural honeycomb shape and has excellent strength-to-weight ratio.
c) Has a circle shape and has excellent strength-to-weight ratio.

Câu 45: Which is not a possible temper designation?

a) 2024-W
b) 2024-O
c) 2024-H

Câu 46: Which of the following statements is correct about Ultrasonics testing?

a) Ultrasonic waves travel through solids and liquids at relatively high speeds, but are rapidly attenuated in gasses. The density and the elasticity of the medium may affect the wave speed.
b) The part to be inspected by ultrasonics is stressed by the application of heat, a static load or vibration to bring out the effect of the flaw on the surface displacement.
c) Ultrasonics is a NDT technique that uses X−rays or gamma rays.

Câu 47: Which of the following statements is correct about Erosion damage?

a) Erosion is the result of contact with a sharp object and only surface fibres are affected and the edges are sharp.
b) Erosion could affect all the leading edge surfaces, especially when the initial surface protection system has been damaged. Erosion, when undetected or unrepaired, may generate composite deterioration.
c) Erosion principally affects the resin and is generally due to accidental contact with aggressive chemical liquids or products (e.g. hydraulic fluid).

Câu 48: Glare is a material consists of aluminum and:

a) Carbon fiber prepreg
b) Aramid fiber prepreg
c) Glass fiber prepreg

Câu 49: The disadvantages of epoxy resins are?

a) Toxic, low pot and shelf−life, high cost
b) Non-toxic, low pot and shelf−life, high cost
c) Toxic, long pot and shelf−life, high cost

Câu 50: When the matrix and the reinforcing material are combined and cured,

a) The part is weaker than the fabric is by itself, and weaker than the resin is by itself.
b) This condition would result in a weak product, and in extreme cases the epoxy would remain sticky.
c) The part is stronger than the fabric is by itself, and stronger than the resin is by itself.

Câu 51: Which of the following is a non-heat treatable aluminum alloy?

a) AlMgMn
b) AlSiCu
c) AlCuMg

Câu 52: Which element is the major ingredient for CRES?

a) Chromium
b) Silicon
c) Nickel

Câu 53: ALCLAD 7075-T6511 is:

a) Solution annealed, quenched, stretched, straightened, artificially aged.
b) Solution annealed, quenched, straightened, stretched, artificially aged.
c) Solution annealed, quenched, bended, stretched, straightened, artificially aged.

Câu 54: How do you differentiate between wrought aluminum and cast aluminum by their designated number?

a) Wrought aluminum has 1 more digit compared to cast aluminum
b) Cast aluminum has 1 digit separated from the previous 3 by a point
c) Wrought aluminum has the last digit being 1 or 2 to specify the form of manufacture

Câu 55: Which of the following statements is correct about Tap testing?

a) Tap testing is only capable of finding flaws that are evident on the visible surface. Internal flaws in composites (such as delamination, disbonding and matrix crazing) are not detectable. In addition, tight surface cracks and edge delamination may not be detectable.
b) Tap testing is extremely sensitive in measuring small surface defects. The part to be inspected is stressed by the application of heat, a static load or vibration to bring out the effect of the flaw on the surface displacement
c) Tap testing is widely used for the quick evaluation of any accessible aircraft surfaces to detect presence of debonding or entrapped water.

Câu 56: Which type of resin is not currently utilized on composite structures?

a) Epoxy resins
b) Thermoplastic resins
c) Phenolic resins

Câu 57: What is the main material of the tailplane and elevator on an A320 aircraft?

a) Aluminium alloy
b) AFRP
c) CFRP and GFRP

Câu 58: The W-state is achieved:

a) After solution annealing
b) After quenching
c) After aging

Câu 59: In a mechanical joint between aluminum alloy and copper, which material will be corroded first

a) None of them, because they are corrosion resistance
b) Aluminum alloy
c) Cu

Câu 60: What are the effects of the Insulation?

a) Insulation is used to control the temperature of the repair during the warm-up, cure and cool-down stages of the repair
b) Insulation is used to reduce heat loss and to minimise the effects of draughts on the repair
c) Insulation is used to seal the vacuum bag to the surface of the item under repair

Câu 61: What is a spring?

a) Is an engineering component which when deflected by a force tends to return to its unloaded shape
b) Is an engineering component which when deflected by a force tends to keep to its unloaded shape
c) Is an engineering component which when deflected by a force tends to return to its loaded shape

Câu 62: HHT is a:

a) Low alloy steel
b) High alloy steel
c) Non-alloyed steel

Câu 63: When there is corrosion on aircraft structures, what are its consequences?

a) The Aircraft is inoperable
b) Aircraft structures are reduced mechanical strength, functional impairment or destroyed if these damaged structures are not repaired appropriately
c) The aircraft is not allowed to operate until the damaged structures are replaced

Câu 64: How many head types of Solid Rivets?

a) 12
b) 11
c) 10

Câu 65: Compared to T6, T61:

a) Has more strength
b) Can be welded
c) Is more ductile

Câu 66: Surface treatment of composite materials includes

a) Electrical Bonding and Painting
b) Heat treatment and Painting
c) Chromic Acid Anodizing (CAA) and Heat treatment

Câu 67: Symbol of Titanium rivets are identified on their head?

a) Titanium rivets are identified by a raised V or T on their head
b) A small dimple in the centre of their head
c) A raised dot in the centre of their head.

Câu 68: When steels are heat treated near its upper limit:

a) Tends to fracture without much deformation
b) Absorbs more energy by deformation
c) Yields the desire structural reliability from either dynamic or static loads

Câu 69: Aluminum alloy has good corrosion resistance right?

a) Wrong
b) Right
c) It depends on the main metal in the alloy

Câu 70: What are the effects of the Perforated Parting Film?

a) To prevent the bagging materials sticking to the repair surface. The film is perforated with small holes to allow air and gases to escape from the repair piles. Some resin will escape through the holes so, for repair, it is best to choose a film with pin-pricks to reduce the resin loss. Perforated parting film will produce a shiny, resin-rich surface on the repair.
b) To help even-out the temperature over the entire repair, help even-out the pressure over the whole repair and improve the flatness of the surface of the repair.
c) To allow the air and gases to escape easily

Câu 71: Which type of damage is a skin not-perforated damage?

a) Abrasion, Lightning strike, Delamination, Scratches, Dents, Holes, Gouges
b) Abrasion, Debonding, Delamination, Nicks, Dents, Holes, Gouges
c) Abrasion, Debonding, Delamination, Nicks, Dents, Gouges, Scratches

Câu 72: Which of the following can be used with titanium fire?

a) Water
b) Powder extinguisher
c) Foam extinguisher

Câu 73: The advantages of composite materials are:

a) High strength-to-weight ratio, Reduction of parts and fasteners, Reduction of wear, Easy to repair.
b) High strength-to-weight ratio, Reduction of parts and fasteners, Reduction of wear, Corrosion resistance.
c) High strength-to-weight ratio, Reduction of parts and fasteners, Reduction of wear, Generally expensive

Câu 74: Why say Corrosion of metals is the tendency to return to their natural state?

a) Because in nature metals exist in the form of alloys
b) Because in nature, almost all metals exist in the form of noble metals, thus alloys tend to return to their metal oxides form
c) Because in nature, except some noble metals, almost metals do not exist in their pure form, exist only in the form of metal ores (oxides)

Câu 75: Symbol of solid rivet 2017 Aluminium Alloy (AD)?

a) They are identified by two raised dashes on their heads.
b) A raised dot in the centre of their head.
c) A small dimple in the centre of their head

Câu 76: Which symbol on TAPER-LOK HEAD MARKS is Heat Resistant Alloy?

a) HB
b) CB
c) H

Câu 77: The effectiveness of an adhesive depends on several factors, including:

a) Resistance to slippage and shrinkage, Malleability, Cohesive strength and Adhesion
b) Resistance to slippage and shrinkage, Cohesive strength and Adhesion
c) Resistance to slippage and shrinkage, Malleability

Câu 78: What is the purpose of the water break test?

a) Make sure the repair surface is clean of grease and contamination
b) Ensure that there is no further damage at the repair surface
c) Make sure the repair surface is clean of grease and contamination and no further damage at the repair surface

Câu 79: Epoxy resins will cure at:

a) Room temperature or high temperature
b) At 0°C
c) Room temperature

Câu 80: Aramid fibres are also known as:

a) KEVLAR
b) Graphite
c) Silica

Câu 81: Which type of fit are used to install Lockbolt pins in thin structure?

a) Clearance fit
b) Transitionfit
c) Interference Fit

Câu 82: When you start drilling titanium, which of the following drill bits cannot be used?

a) 5/32 in
b) 1/8 in
c) 3/16 in

Câu 83: In the solution annealing process, the temperature of the aluminum alloy is brought to:

a) Above the solubility curve
b) Below the solubility curve
c) Exactly the solubility curve

Câu 84: Generally, the quenching process happens in:

a) A salt bath
b) An oil bath
c) A water bath

Câu 85: When you mix the recommended amount of hardener into resin, the part will be

a) Cured
b) Sticky
c) Unreacted

Câu 86: What testing methods can detect the presence of debonding and delamination damages?

a) Tap Testing, Visual or optical inspection
b) Tap Testing, Ultrasonics
c) Penetrant, Ultrasonics

Câu 87: What will happen if Austenitic steel works under high temperature?

a) It can lose their corrosion resistance ability
b) Steel characteristics do not change, due to their high thermal strength
c) They will become softer

Câu 88: What is/are material of the anti friction bearing raceways and rolling elements?

a) Chromium steel or chromium nickel steel
b) Chromium steel or titanium nickel steel
c) Aluminum or chromium nickel steel

Câu 89: Which load(s) the tapered roller bearing can handle?

a) Radial and axial loads
b) Axial and thrust loads
c) Radial and thrust loads

Câu 90: If there is an area with worm-like traces on the surface of the aluminum alloy, what kind of corrosion is it

a) Electrochemical Corrosion
b) Filiform Corrosion
c) Galvanic Corrosion

Câu 91: Nomex core is made from:

a) Aluminium
b) A paper-impregnated material
c) Carbon

Câu 92: Name one method of corrosion protection that uses electrochemical reactions

a) Electrolysis
b) Electroplating technique
c) Electrochemical

Câu 93: A clearance fit hole (unless specified differently) must be used if one or more of the structural members to be attached are made of?

a) Aluminum alloy
b) Steel, Stainless steel, Titanium
c) Application for all material

Câu 94: Which of the following statements is correct about the Repair of honeycombs and covering?

a) Repair of honeycombs and covering is recommended for small damages of the honeycomb material. The area is filled with thickened resin/hardener alloy and in the next step made plane. However, the repaired area has lost nearly the half of its original strength.
b) Repair of honeycombs and covering is an approved repair for delamination or dissolving adhesives. If the damage is caused by contamination or water absorption, this type of repair is not recommended
c) Repair of honeycombs and covering is typical for sandwich structures. It is easy to accomplish especially if the damaged parts are very small. Today two different repairs of sandwich parts can be accomplished: Repair of the covering, if only one side of the covering and/or parts of the combs are damaged; Repair of the covering, if both covering parts and the combs are damaged

Câu 95: Which fibre is used mainly for new Airbus aircraft radome?

a) QFRP
b) CFRP
c) AFRP

Câu 96: Corrosion occurs when two dissimilar metals make electrical contact in the presence of an electrolyte, what is it?

a) Galvanic corrosion
b) Electrochemical Corrosion
c) Fretting Corrosion

Câu 97: What does Shelf Life mean?

a) Shelf Life is the length and time that a catalyzed resin will remain in a workable state
b) The shelf life is the time which the product is still good in an unopened container and varies from product to product
c) The shelf life is the time that resin remains suitable for application after it has been mixed.

Câu 98: Compared to aluminum, steel has:

a) Lower density
b) Higher density
c) The same density

Câu 99: What are the effects of Non−Perforated Parting Film?

a) To leave a rough finish. This produces a surface which can be painted or bonded without further sanding.
b) To provide an easy path for air to escape and to absorb any resin which comes through the holes in the perforated parting film.
c) To prevent resin soaking through onto the other bagging materials and the heater blanket.

Câu 100: What is a sandwich construction?

a) A core is bonded between two thin-face sheets, providing a rigid, lightweight component
b) A core is bonded with one thin-face sheet, providing a rigid, lightweight component
c) Two thin-face sheets are bonded together, providing a rigid, lightweight component

Câu 101: Bonding prepreg is used

a) To connect GFRP laminates
b) To connect CFRP laminates
c) To connect GFRP laminates with honeycombs or sheet metal parts.

Câu 102: Which type of damage is a skin perforated damage (with damage of fibres)?

a) Abrasion, Delamination, Scratches, Dents, Gouges
b) Holes, Lightning strike, Impact by foreign object (FOD)
c) Abrasion, Debonding, Delamination, Nicks, Dents, Gouges, Scratches

Câu 103: Which of the following statements is correct about Radiography testing?

a) Radiography is only capable of finding flaws that are evident on the visible surface.
b) The part to be inspected by radiography is stressed by the application of heat, a static load or vibration to bring out the effect of the flaw on the surface displacement.
c) Radiography is a NDT technique that uses X−rays or gamma rays.

Câu 104: The MS-Fitting consists of?

a) A fitting, a sleeve and a union nut
b) A fitting, a bolt and a union nut
c) A fitting, a sleeve and a flare nut

Câu 105: When remove solid rivet, you must drill-out on?

a) Manufacture head
b) Upset head
c) Any direction head you can access

Câu 106: How can you recycle aluminum material?

a) Remelting
b) Polishing
c) Alloying

Câu 107: Which factors have a positive effect on surface wetting?

a) Removal of surface contamination, Viscosity reduction through application of heat, Time and pressure at the bonding point.
b) Fingerprints left on adherent surfaces, Residues not removed from the adherent surfaces, Low temperatures, Incorrect or no surface pre-treatment.
c) Removal of surface contamination, Time and pressure at the bonding point, Low temperatures

Câu 108: Aluminum alloy designated with 3XX.X has which element as its major alloying element?

a) Manganese
b) Magnesium and silicon
c) Silicon with copper and/or magnesium

Câu 109: With the AISI standard, the last 2 digits represent Carbon content in:

a) 1/10%
b) 1/100%
c) 1/1000%

Câu 110: With the AISI standard, the second digit means:

a) Carbon percentage
b) Primary alloy percentage
c) Secondary alloy percentage

Câu 111: What are the typical of repairs on Composite parts?

a) Injection repair, repair of edges.
b) Repair of coverings and honeycombs
c) Injection repair, repair of edges and repair of coverings, honeycombs

Câu 112: There is a damage on the surface of the ALCLAD sheet, the depth of which exceeds 7% of the thickness of the metal sheet. If not repaired, what kind of corrosion is most likely to occur?

a) Intergranular Corrosion
b) Fretting Corrosion
c) Filiform Corrosion

Câu 113: Which type of fit are used to install Lockbolt pins in any structure?

a) Interference Fit
b) Transitionfit
c) Interference or transition fit

Câu 114: What is the base element of ferrous materials?

a) Steel
b) Iron
c) Copper

Câu 115: How many types of Harrison-Type-Fittings?

a) 1
b) 3
c) 2

Câu 116: What type of non-alloyed steel is use on aircrafts?

a) Construction steel
b) Carbon steel
c) Manufacturing steel

Câu 117: How many standard grades of glare are there?

a) 4
b) 5
c) 6

Câu 118: Which of the following statements is correct about Delamination damage?

a) Delamination is a deformity caused by extraneous forces, which are applied to the structure. This can be an impact (FOD) for example.
b) Delamination is when a separation of materials, e.g. stringer to skin, occurs due to an adhesive failure
c) Delamination is when the separation of plies occurs in a multi-laminate material. This can be caused by the material being hit (impact delamination), or when there is a resin failure for any other reason.

Câu 119: Which of the following statements is correct about Repair through Injection of Resin?

a) Repair through Injection of Resin is recommended for small damages of the honeycomb material. The area is filled with thickened resin/hardener alloy and in the next step made plane. However, the repaired area has lost nearly the half of its original strength.
b) The repair through injection of resin is an approved repair for delamination or dissolving adhesives. If the damaged is caused by contamination or water absorption, this type of repair is not recommended.
c) Repair through Injection of Resin is typical for sandwich structures. It is easy to accomplish especially if the damaged parts are very small. Today two different repairs of sandwich parts can be accomplished: Repair of the covering, if only one side of the covering and/or parts of the combs are damaged; Repair of the covering, if both covering parts and the combs are damaged

Câu 120: Pure iron is:

a) Very soft
b) Very hard
c) Moderate hardness

Câu 121: Reinforcing materials are include:

a) Fibreglass, Aramid, Graphite
b) Fibreglass, Aramid, Kevlar
c) CFRP, Aramid, Graphite

Câu 122: Which cannot be classified as a HHT steel?

a) It has 5% Tungsten and 3% Chromium
b) It has 4% Chromium and 4% Vanadium
c) It has 6% Nickel and 2% Chromium

Câu 123: Which adhesive has to evaporate one of its components to cure?

a) Solvent adhesives
b) Contact adhesives
c) Dispersion adhesives

Câu 124: What are the effects of the Heater Blanket?

a) Heater Blanket is used to control the temperature of the repair during the warm-up, cure and cool-down stages of the repair
b) Heater Blanket is used to reduce heat loss and to minimise the effects of draughts on the repair
c) Heater Blanket is used to seal the vacuum bag to the surface of the item under repair

Câu 125: When you see the white-grey powdery on surface of steel, what does it mean?

a) Mean nothing
b) This is a sign of corrosion on surface
c) This is the production of the oxidation on steel surface

Câu 126: Do Monel rivets need to be heat treated before use?

a) No
b) Yes
c) Not given

Câu 127: Why aircraft fuselage structure joints use aluminum alloy rivets and not steel or monel rivets?

a) Because aluminum alloy rivets are easy to install
b) Because aluminum alloy rivets have better strength and less susceptible to corrosion than others
c) This will minimize corrosion due to the dissimilar metal of rivets and aircraft structures

Câu 128: Which of these is not likely the cause of hydrogen embrittlement?

a) Improper processing of the material
b) Service induced stresses
c) Installation residual stresses

Câu 129: When remove Hi Lok/Hilite, you must?

a) Drill on manufacture head
b) Upset head
c) Loosen Collar/nut and then punch out the rivet or drill any direction head you can access

Câu 130: Which of the following statements is correct about Abrasion damage?

a) Abrasion is damage to a surface caused by scuffing, rubbing or scraping of the component. Fibres are not damaged and mechanical performance is not affected.
b) Abrasion is when a separation of materials, e.g. stringer to skin, occurs due to an adhesive failure
c) Abrasion is the result of contact with a sharp object and only surface fibres are affected and the edges are sharp

Câu 131: Which factors have a negative effect on surface wetting?

a) Removal of surface contamination, Viscosity reduction through application of heat, Time and pressure at the bonding point.
b) Fingerprints left on adherent surfaces, Residues not removed from the adherent surfaces, Low temperatures, Incorrect or no surface pre-treatment.
c) Removal of surface contamination, Time and pressure at the bonding point, Low temperatures

Câu 132: What are the effects of the Caul Plate?

a) To prevent the bagging materials sticking to the repair surface. The film is perforated with small holes to allow air and gases to escape from the repair piles. Some resin will escape through the holes so, for repair, it is best to choose a film with pin-pricks to reduce the resin loss. Perforated parting film will produce a shiny, resin-rich surface on the repair.
b) To help even-out the temperature over the entire repair, help even-out the pressure over the whole repair and improve the flatness of the surface of the repair.
c) To allow the air and gases to escape easily

Câu 133: Which is not a valid temper designation?

a) 2117-T2
b) 2014-T3
c) 7175-T6

Câu 134: Which is a possible temper designation?

a) 5052-T3
b) 5052-W
c) 5052-H

Câu 135: Can install the pin (threaded) fasteners with power or hand tools?

a) Not allow
b) Just hand tools
c) Yes, depending on the position the power/hand tools can access.

Câu 136: Which type of solid rivet may used in tank sealing rivets?

a) Type A- and DD rivets
b) Type A- and AD rivets
c) Type AD- and DD rivets

Câu 137: Styles of fabrics are include:

a) Roving, warp-reinforced fabric, fabrics
b) Roving, mats, fabrics
c) Roving, warp-reinforced fabric, linen fabrics

Câu 138: Construction of an anti-friction bearing consists of?

a) The outer and inner raceway, the rolling element and usually a rolling element cage
b) The inner raceway, the rolling element and usually a rolling element cage
c) The outer raceway, the rolling element and usually a rolling element cage

Câu 139: The length and of time that a catalyzed resin will remain in a workable state is called the

a) Shelf life
b) Service life
c) Pot life

Câu 140: Which type of fibre causes aluminum corrosion?

a) Aramid fibre
b) carbon fibre
c) Glass fibre

Câu 141: Prepreg fibers are:

a) These fibres are impregnated with resin.
b) These fibres are already impregnated with resin in the production process and then heated very fast.
c) These fibres are already impregnated with resin in the production process and then cooled down very fast.

Câu 142: Which bearing distributes the load over the length of the roller (line contact)?

a) Spherical roller bearing
b) The tapered roller bearing
c) The ball bearing

Câu 143: Which spring can produce tensional and torsional movement?

a) Wireform Springs
b) Torsion Springs
c) Compression Springs

Câu 144: What are the basic conditions for the formation of corrosion?

a) Material, environment and the chemical reaction of material with environment
b) Material, inert gas and the chemical reaction of material with gas
c) Material, Oxygen and temperature

Câu 145: With aluminum alloys are used on aircraft, which part plays the role of corrosion resistance

a) The main metal composition in the alloy will determine its corrosion resistance
b) Due to the low strength of aluminium alloy, it is unsuitable for aircraft structures
c) A thin layer of pure aluminium on surface is a means of corrosion protection

Câu 146: The disadvantages of composite materials are:

a) Generally expensive. Not easy to repair; you need well-trained staff, tools, equipment and facilities to repair composite components.
b) Generally expensive. Easy to repair; you need well-trained staff, tools, equipment and facilities to repair composite components.
c) Generally cheap. Easy to repair; you don't need well-trained staff, tools, equipment and facilities to repair composite components.

Câu 147: Where may chains be found in?

a) Control Column Installations, Elevator Controls and Trim Control Systems
b) Control Column Installations, Aileron and Elevator Controls and Trim Control Systems
c) Control Column Installations, Aileron and Trim Control Systems

Câu 148: Which of these aluminum are weldable and heat treatable?

a) 5056
b) 6061
c) 7475

Câu 149: The most simple composite is composed of

a) A metallic and a non-metallic material
b) A matrix and a reinforcing material
c) A metallic and reinforcing material

Câu 150: How is compression springs work?

a) By resisting compressive force
b) By resisting externally applied torque
c) By their initial tension resisting the pulling force to which their ends are attached

Câu 151: Compared to cast aluminum alloys, wrought aluminum alloys:

a) Are more brittle
b) Are less brittle
c) Have the same brittleness

Câu 152: In general, Titanium is not:

a) Castable
b) Cuttable
c) Millable

Câu 153: When you immerse a electrode metal bars in electrolyte fluid, what will happen with the Anode?

a) The dissolved ions take in electrons and deposit as metal atoms on the electrode surface, which means that the metal ions are reduced
b) This is an oxidation-reduction reaction
c) Positively charged metal-ions are emitted to the electrolyte, and leave behind negatively charged electrodes in the metal

Câu 154: Which of the following usually has the thickest clad layer?

a) 0.0055 m 2024 Al
b) 0.3 inch 7075 Al
c) 6200 µm2117 Al

Câu 155: Which bearing combines the benefits of all the other bearing types as well as offering additional advantages?

a) Spherical roller bearing
b) The tapered roller bearing
c) The ball bearing

Câu 156: CRES is a:

a) Low alloy steel
b) High alloy steel
c) Non-alloyed steel

Câu 157: How many percent of resin are there in a standard prepreg?

a) 18 to 20%
b) 0.38
c) 0.5

Câu 158: Which of the following statements is correct about Filling Repair?

a) Filling Repair Resin is recommended for small damages of the honeycomb material. The area is filled with thickened resin/hardener alloy and in the next step made plane. However, the repaired area has lost nearly the half of its original strength.
b) Filling Repair is an approved repair for delamination or dissolving adhesives. If the damage is caused by contamination or water absorption, this type of repair is not recommended.
c) Filling Repair is typical for sandwich structures. It is easy to accomplish especially if the damaged parts are very small. Today two different repairs of sandwich parts can be accomplished: Repair of the covering, if only one side of the covering and/or parts of the combs are damaged; Repair of the covering, if both covering parts and the combs are damaged

Câu 159: What are the effects of the Breather Fabric?

a) To prevent the bagging materials sticking to the repair surface. The film is perforated with small holes to allow air and gases to escape from the repair piles. Some resin will escape through the holes so, for repair, it is best to choose a film with pin-pricks to reduce the resin loss. Perforated parting film will produce a shiny, resin-rich surface on the repair.
b) To help even-out the temperature over the entire repair, help even-out the pressure over the whole repair and improve the flatness of the surface of the repair.
c) To allow the air and gases to escape easily

Câu 160: In 2 metal joints: 1 - between aluminum alloy 2024 and tin, 2 - between 2024 and Zinc. In which joints aluminum alloy 2024 will be corroded first after a period of working time

a) In the joint between 2024 and Tin
b) In the joint between 2024 and Zinc
c) None of them

Câu 161: Which symbol on TAPER-LOK HEAD MARKS is 6Al4V Titanium Alloy?

a) HB
b) V
c) H

Câu 162: The solution annealing time of a material depends on:

a) The type of material
b) The thickness of the material
c) The type of furnace used

Câu 163: How many types of anti−friction bearings?

a) 3
b) 4
c) 5

Câu 164: What are the effects of the Peel Ply?

a) To leave a rough finish. This produces a surface which can be painted or bonded without further sanding.
b) To provide an easy path for air to escape and to absorb any resin which comes through the holes in the perforated parting film.
c) To prevent resin soaking through onto the other bagging materials and the heater blanket.

Câu 165: What are 02 kinds of bearings loading?

a) Radial and thrust
b) Axial and thrust
c) Radial and axial

Câu 166: What are steel grades?

a) Rating of steel’s usefulness
b) The cost to make the steel
c) The different kinds of steels, distinguished by the specific properties

Câu 167: XXX aluminum has at least:

a) 99.00% aluminum
b) 99.09% aluminum
c) 99.99% aluminum

Câu 168: Can steels made from alloys of chromium (Cr)−nickel (Ni) and chromium−nickel-manganese be corroded?

a) No, They are corrosion resistance steels
b) Yes, if it works under high temperature environment
c) Yes, after hardened only by cold-working

Câu 169: What appear when HHT steel suffers from cold-shortness?

a) Cracks
b) Nicks
c) Scratches

Câu 170: The film adhesive has to be stored

a) Under refrigeration at 0°C
b) At room temperature.
c) Under refrigeration at −18°C

Câu 171: Which type of fit are used to install Lockbolt pins in thick structure?

a) Clearance fit
b) Transitionfit
c) Interference Fit

Câu 172: Which bearing have a ’point’ contact between the balls and the races?

a) Spherical roller bearing
b) The tapered roller bearing
c) The ball bearing

Câu 173: The purpose of quenching is to:

a) Cool down the material
b) Fix the state achieved with solution annealing
c) Harden the material

Câu 174: Monel rivets are used on which material?

a) Steel riveted assemblies
b) Steel, titanium or aluminium alloy riveted assemblies
c) Steel or aluminium alloy riveted assemblies

Câu 175: The process to make ALCLAD 2024-T42 from ALCLAD 2024-T3 is?

a) Soft annealing, solution annealing, quenched, naturally aged.
b) Soft annealing, solution annealing, quenched, stress relieved by stretching, naturally aged.
c) Soft annealing, solution annealing, quenched, stress relieved by compressing, naturally aged.

Câu 176: Core material is include

a) Foam and adhesive film
b) Foam and resin
c) Foam and honeycomb core

Câu 177: Carbon steel has carbon content around:

a) 0.05 up to 0.5%
b) 0.5 up to 0.8%
c) 0.8 up to 1%

Câu 178: Which of the following statements is correct about Lightning Strike damage?

a) The effect of a lightning strike depends on the material will not be the same. For non-conductive materials like Glass- and Aramid Fibre a large part of the component, if not completely protected, may be blown out because both skins are affected and the core generally vapourised due to the extreme heat
b) Lightning strike is when a separation of materials, e.g. stringer to skin, occurs due to an adhesive failure
c) Lightning strike is when the separation of plies occurs in a multi-laminate material. This can be caused by the material being hit (impact delamination), or when there is a resin failure for any other reason.

Câu 179: Which of the following are commonly used thixotropic agents?

a) Micro-balloons and glass fibre
b) Micro-balloons and carbon fibre
c) Micro-balloons and aerosil.

Câu 180: What are the effects of the Bleeder Cloth?

a) To leave a rough finish. This produces a surface which can be painted or bonded without further sanding.
b) To provide an easy path for air to escape and to absorb any resin which comes through the holes in the perforated parting film.
c) To prevent resin soaking through onto the other bagging materials and the heater blanket.

Câu 181: In the solution annealing process, the temperature and soak time of the material depends on:

a) The material manufacturer
b) The aircraft manufacturer
c) The authority

Câu 182: When soft annealing steel, after heating, you must:

a) Cool it down by quenching
b) Cool it down in the furnace slowly
c) Cool it down at room temperature

Câu 183: Working pressure of HP-Tubes is?

a) Above 1500 PSI
b) Above 1800 PSI
c) Under 1500 PSI

Câu 184: What are rivets made of US material 1100 used for?

a) Attach aluminium alloy components where a high−strength rivet
b) Attach aluminium alloy components where a low−strength rivet is sufficient to hold the load.
c) Attach aluminium alloy components where a normal−strength rivet is sufficient to hold the load.

Câu 185: How to identify material and type of solid rivets are identified by?

a) Symbol and shape on head of rivet
b) Shape of rivet
c) Length of rivet

Câu 186: Basically, what is corrosion?

a) Corrosion is defined as an undesirable, natural reaction of materials with substances in their environment
b) Corrosion is defined as a desired chemical reaction of materials with substances in their environment
c) Corrosion is a type of mechanical abrasion that reduces material thickness

Câu 187: AISI 6xxx has which element as its primary alloying element?

a) Chromium
b) Chromium-vanadium
c) Nickel-chromium

Câu 188: The two main types of resin used as a matrix are:

a) Thermoplastic resins and polyester resin
b) Thermosetting resin and thermoplastic resin
c) Epoxy resins and phenolic resins

Câu 189: How many main types of resin are used as a matrix?

a) 2 types
b) 3 types
c) 4 types

Câu 190: When blind rivets which are used for repair work on the aircraft?

a) At the locations in an aircraft structure, which are need the heavy load
b) At the locations in an aircraft structure, which are need the light load
c) At the locations in an aircraft structure, which are very hard to reach for riveting - it is impossible to set a rivet snap at the other site of the rivet

Câu 191: Which properties make it so that glare is better than aluminum alloys at protecting the load carrying structure underneath the skin?

a) Good impact properties
b) Good fatigue resistance
c) Good damage tolerant properties

Câu 192: Which spring are used to apply a fixed load throughout their life?

a) High Duty Springs
b) Static Load Springs
c) General Duty Springs

Câu 193: In a Galvanic Cell made from Zn (Anode) and Cu (Cathode), which electrode is oxidized

a) Cu
b) Zn
c) None

Câu 194: Pin (threaded) fasteners are usually installed in interference-fit holes?

a) TRUE
b) FALSE
c) Not given

Câu 195: Which of the following statements is correct about Chemical Degradation damage?

a) Chemical degradation is the result of contact with a sharp object, only surface fibres are affected and the edges are sharp.
b) Chemical degradation could affect all the leading edge surfaces. Chemical degradation, when undetected or unrepaired, may generate composite deterioration.
c) Chemical degradation principally affects the resin and is generally due to accidental contact with aggressive chemical liquids or products (e.g. hydraulic fluid).

Câu 196: Which type of resin is not used on composite structures?