When drilling stainless steel, use a.

drill ground to 120 °, slow cutting speed.

drill ground to 90 °, fast cutting speed.

drill ground to 90 °, slow cutting speed.

How is a material galvanised?.

Dipped in a bath of molten zinc.

Packed in a drum containing zinc dust and heated.

What temperature would steel be tempered at?.

Below the annealing temperature

Above the annealing temperature.

Tempering steel gives.

relief of internal stress after hardening

Chromium added to plain carbon steel.

increases it's resistance to corrosion.

turns it into a non-ferrous alloy.

The purpose of case hardening is to.

produce a hard case over a tough core.

reduce the carbon in the steel.

introduce carbon into the steel

At normal temperatures HC steel is harder because.

of the % of carbon in the granules.

With respect to ferrous metals which of the following is true?.

Iron is a main element and most ferrous metal are magnetic.

Iron is not any element of ferrous metals.

Iron is a main element and ferrous metals are not magnetic.

The annealing process on steel is required sometimes as it.

relieves internal stress suffered after engineering processes.

provides a corrosion resistant layer that prevents oxidation.

allows the material a greater stress per unit area.

If a material is found to be in the tertiary phase of creep the following procedure should be implemented:.

The component should be replaced immediately.

The component should under go dye penetrant process and condition monitored.

The crack should be stop drill, condition monitoring should be applied.

Phosphating of steels is carried out by immersing the steel in to a solution of.

phosphoric acid and metal phosphates.

metal phosphates and sulphuric acid

heating under the UCP and slow cooling.

heating over the UCP and fast cooling.

heating over the UCP and slow cooling

The formation of steel depends upon.

the formation of austenite into pearlite.

the formation of pearlite into austenite.

the presence of pearlite in the structure

The hardness of steel depends upon.

formation of pearlite into austenite.

the iron austenite grain structure.

The difference between annealing and normalizing is.

both are heated above the UCT, cool slowly to anneal, cool in air to normalize.

both are heated below the UCT, cool in air to anneal, cool slowly to normalize.

both are heated above the UCT, cool in air to anneal, cool slowly to normalize.

Normalizing of steel is done to.

remove residual stress of the manufacturing process.

restore the fatigue life of steel.

When normalising, the material is.

left to cool in room temperature.

Tempering of hardened steel is carried out to.

significantly reduce the brittleness without suffering a major drop in its strength.

retain surface hardness, but soften the core.

retain core hardness, but soften the surface.

Fatigue failure may be defined as.

reduction in strength due to alternating loads.

failure caused by stress in excess of the material U.T.S.

Austenitic steel is produced when the material is heated to.

above the Upper Critical Point.

above the Lower Critical Point.

below the Upper Critical Point.

During a Rockwell Hardness test, what dimension is measured?.

The diameter and depth of the indent.

What does the 0 in 2024-T3 mean?.

The alloy has not been modified.

The percentage of impurities in the alloy.

In most aircraft hydraulic systems, two-piece tube connectors consisting of a sleeve and a nut are used when a tubing flare is required. The use of this type of connector eliminates.

the possibility of reducing the flare thickness by wiping or ironing during the tightening process.

the flaring operation prior to assembly.

wrench damage to the tubing during the tightening process.

In the tensile strength test.

the material is pulled to until it breaks.

the material is pulled to limit of elasticity.

the material is pulled until it reaches its UTS

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Perguntas do quiz (200)

1When drilling stainless steel, use a.
1. Adrill ground to 120 °, slow cutting speed.
2. Bdrill ground to 90 °, fast cutting speed.
3. Cdrill ground to 90 °, slow cutting speed.
2How is a material galvanised?.
1. ASprayed with nickel solution.
2. BPacked in a drum containing zinc dust and heated.
3. CDipped in a bath of molten zinc.
3What temperature would steel be tempered at?.
1. AAt the annealing temperature.
2. BAbove the annealing temperature.
3. CBelow the annealing temperature
4Tempering steel gives.
1. Agreater brittleness.
2. Bgreater hardness.
3. Crelief of internal stress after hardening
5 The addition of chromium to steel will produce.
1. Atoughness.
2. Bhardness.
3. Cductility
6Chromium added to plain carbon steel.
1. Aincreases it's resistance to corrosion.
2. Bturns it into a non-ferrous alloy.
3. Cmakes the metal softer.
7The purpose of case hardening is to.
1. Aproduce a hard case over a tough core.
2. Breduce the carbon in the steel.
3. Cintroduce carbon into the steel
8 At normal temperatures HC steel is harder because.
1. Ait has more austenite.
2. Bof the % of carbon in the granules.
3. Cit has less austenite.
9Nitriding is.
1. Atempering.
2. Banodising.
3. Ccase hardening.
10Medium carbon steels have a carbon content of.
1. A0.3 - 0.5 %.
2. B0.5 - 0.8 %.
3. C0.8 - 1.05 %.

11 A ferrous metal contains.
1. Aaluminium.
2. Biron.
3. Cmagnesium.
12With respect to ferrous metals which of the following is true?.
1. AIron is not any element of ferrous metals.
2. BIron is a main element and most ferrous metal are magnetic.
3. CIron is a main element and ferrous metals are not magnetic.
13The annealing process on steel is required sometimes as it.
1. Aprovides a corrosion resistant layer that prevents oxidation.
2. Ballows the material a greater stress per unit area.
3. Crelieves internal stress suffered after engineering processes.
14Cobalt steel tested on the Brinell test would have a BHN number between.
1. A100 to 175.
2. B300 to 400.
3. C600 to 700.
15 If a material is found to be in the tertiary phase of creep the following procedure should be implemented:.
1. AThe component should under go dye penetrant process and condition monitored.
2. BThe crack should be stop drill, condition monitoring should be applied.
3. CThe component should be replaced immediately.
16What is used for marking out steels?.
1. AEngineers blue.
2. BWax crayon.
3. CCopper sulphate.
17Phosphating of steels is carried out by immersing the steel in to a solution of.
1. Aphosphoric acid and metal phosphates.
2. Bnitric acid and sulphur.
3. Cmetal phosphates and sulphuric acid
18Tempering entails.
1. Aheating under the UCP and slow cooling.
2. Bheating over the UCP and fast cooling.
3. Cheating over the UCP and slow cooling
19Austenitic stainless steels are.
1. Amagnetic.
2. Bnon-magnetic.
3. Chardened by heat treatment
20The formation of steel depends upon.
1. Athe formation of pearlite into austenite.
2. Bthe formation of austenite into pearlite.
3. Cthe presence of pearlite in the structure
21How is residual magnetism removed after an NDT examination?.
1. AEMI.
2. BEMC.
3. CDegaussing.
22The hardness of steel depends upon.
1. Aformation of pearlite into austenite.
2. Bformation of cementite.
3. Cthe iron austenite grain structure.
23The difference between annealing and normalizing is.
1. Aboth are heated above the UCT, cool slowly to anneal, cool in air to normalize.
2. Bboth are heated below the UCT, cool in air to anneal, cool slowly to normalize.
3. Cboth are heated above the UCT, cool in air to anneal, cool slowly to normalize.
24Normalizing of steel is done to.
1. Aremove residual stress of the manufacturing process.
2. Bmake steel softer.
3. Crestore the fatigue life of steel.
25When normalising, the material is.
1. Aquenched immediately.
2. Bleft to cool in room temperature.
3. Ccooled slowly.
26Cast iron is.
1. Avery malleable.
2. Btough.
3. Cheavy and brittle.
27Case hardening can be carried out on.
1. Atitanium.
2. Bany ferrous metal.
3. Cduralumin
28Exhaust systems are usually made from stainless steel which is susceptible to.
1. Asurface corrosion.
2. Bfiliform corrosion.
3. Cintergranular corrosion.
29When metal is first heated slightly above its critical temperature and then cooled rapidly it is common that the metal will increase in.
1. Abrittleness.
2. Bboth of the above.
3. Chardness.
30Steel is tempered.
1. Aafter hardening.
2. Bbefore hardening.
3. Cto increase hardening.
31 If a steel component is operated below the fatigue limit. The fatigue life is.
1. Afinite.
2. Binfinite.
3. Cdepend on its proof stress.
32A low carbon steel would normally be case hardened using.
1. Athe nitriding process.
2. Bflame or induction hardening.
3. Cpack or gas carburising.
33After a product has been manufactured and all heat treatment has been carried out the stress remaining if any is termed as.
1. Aresidual stress.
2. Bworking stress.
3. Capplied stress.
34Annealing steels.
1. Atoughens the metal.
2. Bmakes the metal malleable.
3. Cmakes the metal brittle
35Tempering of hardened steel is carried out to.
1. Aretain surface hardness, but soften the core.
2. Bretain core hardness, but soften the surface.
3. Csignificantly reduce the brittleness without suffering a major drop in its strength.
36High speed steel relies heavily on the following metallic element for its ability to cut other metals, even when it is heated to a dull red colour.
1. ATungsten.
2. BNickel.
3. CVanadium.
37When a low carbon steel bolt is stretched beyond its elastic limit without breaking, it will.
1. Adeform temporarily.
2. Bbecome more ductile.
3. Cdeform permanently.
38 1% Nickel, 1% Carbon, steel is widely used for.
1. Aexhaust valves.
2. Bball and roller bearings.
3. Chigh tensile steel bolts
39Fatigue failure may be defined as.
1. Afailure caused by stress in excess of the material U.T.S.
2. Bfailure due to impact.
3. Creduction in strength due to alternating loads.
40Normalising steels.
1. Aincreases toughness.
2. Bincreases the hardness.
3. Crelieves the stresses.
41Cast iron is.
1. Atough.
2. Bheavy and brittle.
3. Cvery malleable
42Austenitic steel is produced when the material is heated to.
1. Aabove the Upper Critical Point.
2. Babove the Lower Critical Point.
3. Cbelow the Upper Critical Point.
43Steel is produced by refining pig iron where air/oxygen is blown through the molten material to remove.
1. Acarbon.
2. Boxides.
3. Csulphur
44During a Rockwell Hardness test, what dimension is measured?.
1. AThe diameter of the indent.
2. BThe depth of the indent.
3. CThe diameter and depth of the indent.
45What does the 0 in 2024-T3 mean?.
1. AThe percentage of impurities in the alloy.
2. BThe alloy has not been modified.
3. CThe alloy has been modified
46In most aircraft hydraulic systems, two-piece tube connectors consisting of a sleeve and a nut are used when a tubing flare is required. The use of this type of connector eliminates.
1. Athe flaring operation prior to assembly.
2. Bthe possibility of reducing the flare thickness by wiping or ironing during the tightening process.
3. Cwrench damage to the tubing during the tightening process.
47In the tensile strength test.
1. Athe material is pulled to limit of elasticity.
2. Bthe material is pulled to until it breaks.
3. Cthe material is pulled until it reaches its UTS
48Impact resistance measures the.
1. Amaterial toughness.
2. Bmaterial hardness.
3. Cmaterial ductility
49Specified time of contact between the indentor and test piece in a vickers or brinell hardness test is.
1. A20 seconds.
2. B10 seconds.
3. C15 seconds
50In an Izod impact test the striking energy of the striker is approximately.
1. A150 J.
2. B163 J.
3. C300 J.
51The Charpy test measures.
1. Astrain.
2. Bimpact energy.
3. CYoung's modulus.
52The 'Fatigue limit' for steel is generally in the region of, compared to the static U.T.S.
1. A40%-60%.
2. B60%-80%.
3. C20%-40%.
53The ability of mild steel to accept more load after the yield point is reached is due to.
1. Anecking.
2. Bstrain hardening.
3. Cplasticisation.
54What is a Rockwell tester used for?.
1. AHardness Testing.
2. BTensile Testing.
3. CFatigue Testing.
55What type of test involves using a weighted pendulum to strike a material until fracture?.
1. AHardness Test.
2. BImpact Resistance Test.
3. CFatigue Testing.
56Which of the folllowing are all hardness testing machines?.
1. ARockwell, Brinell and Izod.
2. BRockwell, Vickers and Izod.
3. CRockwell, Brinell and Vickers.
57The most suitable mixture for a salt bath operation is.
1. A20% nitrate of soda and 80% sodium nitrate.
2. B90% nitrate of soda and 10% sodium nitrate.
3. C70% sodium chlorate and 30% sodium nitrate
58How many times can clad alloy be heat treated?.
1. AOnce only.
2. B3 times.
3. Cas many times as required
59The symbol 'W' on a material indicates.
1. Ait is for use on aircraft mainplanes only.
2. Bit has been solution treated and will respond effectively to precipitation treatment.
3. Cit is for workshop use only.
60For a particular metal material, what conditions are best to minimise creep?.
1. ALow stress, low temperature.
2. BLow stress, high temperature.
3. CHigh stress, low temperature
61What is the effect of precipitation heat treatment on aluminium?.
1. AIt speeds up age hardening process.
2. BIt delays the age hardening process.
3. CIt softens the material to allow it to be worked
62Aluminium exposed to air will.
1. Aoxidise and become weaker.
2. Boxidise and become electrically insulated.
3. Coxidise and become stronger
63What care should you take with 2024-T3?.
1. ADo not scratch or make nicks in it.
2. BDo not bend at sharp angles.
3. CDo not remove the surface of the sheet metal.
64Composition of silver solder is.
1. Atin and lead.
2. Btin, lead and silver.
3. Ctin, lead, silver and antimony
65If aluminium alloy is not quenched within the minimum time allowed after heat treatment is it will be.
1. Asubject to corrosion.
2. Bmalleable.
3. Cbrittle
66Anodizing protects alloy metal from corrosion and does what else?.
1. ASeals the surface from moisture.
2. BMakes a good surface for paint to adhere to.
3. CMakes the surface alkaline
67If caustic soda turns a material black what is it?.
1. AAluminium alloy.
2. BAlclad.
3. CAluminium
68What chemical is used to identify aluminium alloys?.
1. ACaustic soda.
2. BCopper sulphate.
3. CNitric acid.
69Pure aluminium is.
1. Ahighly resistant to corrosion.
2. Bnot resistant to corrosion.
3. Creasonably resistant to corrosion
70Precipitation treating makes the metal.
1. APrecipitation treating makes the metal.
2. Bless strong and hard.
3. Charder, stronger and less ductile.
71A material has the code 2024-TH6 on it. Which part of the code indicates the percentage of the alloying element?.
1. AH.
2. B20.
3. C6.
72Aluminium alloyed primarily with magnesium is numbered.
1. A2025.
2. B5025.
3. C1025
73Heat treatment is shown on a British aluminium alloy by a.
1. Aletter and number code.
2. Bnumber code.
3. Cletter code
74Non heat treatable materials.
1. Acannot be hardened.
2. Bcan be hardened by strain hardening or cold working.
3. Ccan be hardened by annealing
75Which of the following metals is an aluminium silicon alloy used mainly for casting?.
1. AAlclad.
2. BAldrey.
3. CAlpax
76Aircraft skin is joggled to.
1. Aprovide smooth airflow at faying surfaces.
2. Bmake a frame lighter but stronger.
3. Cconform to the aircraft contour.
77The British system of heat treatment codes is.
1. Aa series of letters.
2. Bnumbers and letters.
3. Ca series of numbers.
78In a sheet metal store the following is marked on a sheet of aluminium alloy: L162 (sheet 1). , On a different sheet the following marking is found: L172 (sheet 2). The following is true:
1. ASheet one has a shinier surface than sheet 2.
2. BSheet one is more ductile than sheet 2.
3. CSheet two is of a thicker gauge than sheet 1
79Cold working of a material is used to reduce.
1. Amaterial hardness.
2. Bfatigue.
3. Cwear of manufacturing tools.
80Sheet metal should be stored.
1. Aabove 25 degrees centigrade.
2. Bon its edge in racks to prevent scratching.
3. Cstacked flat to prevent bending of sheets.
81Clad aluminium alloy (alclad) has a pure aluminium coating of.
1. A0.002.
2. B1% of alloy thickness.
3. C5% of alloy thickness.
82The main metal in monel is.
1. Aaluminium.
2. Bnickel.
3. Cstainless steel.
83A tube complying to BS T51 is.
1. Atungum.
2. BHTS tube.
3. Chigh pressure seamless copper tube
84Why is nickel chromium used in many exhaust systems?.
1. ACorrosion resistant and high heat conductivity.
2. BLightweight and flexible.
3. CCorrosion resistant and low expansion coefficient
85Titanium alloys.
1. Aare cheap to manufacture.
2. Bhave a high strength to weight ratio.
3. Care corrosion resistant but heavy.
86Which part of the 2017-T36 aluminium alloy designation indicates the primary alloying agent used in its manufacture?.
1. A20.
2. B2.
3. C17.
87Clad aluminium alloys are used in aircraft because they.
1. Aare harder wearing than unclad aluminium alloys.
2. Bare less subject to corrosion than uncoated aluminium alloys.
3. Care stronger than unclad aluminium alloys.
88Non heat treatable aluminium alloys.
1. Acan be hardened by strain hardening.
2. Bcannot be softened.
3. Ccannot be hardened.
89Solution treatment after manufacturers have performed it once can be carried out a further.
1. A1 time.
2. B2 times.
3. C3 times
90Following solution treatment aluminium alloy can be placed into service.
1. Aafter 5 days.
2. Bstraight away.
3. Cafter 24 hours.
91The time between removal from heat treatment furnace and quenching must be not more than.
1. A3 seconds.
2. B10 seconds.
3. C7 seconds.
92When buffing surface of Aluminium Alloy, what material are you removing?.
1. AOxide layer.
2. BAluminium.
3. CAlloy.
93Why is clad alloy preferred to pure Aluminium?.
1. ALess brittle.
2. BMore ductile.
3. CTougher.
94 Why are aluminium alloys used on aircraft, instead of pure aluminium?.
1. AStronger.
2. BCorrosion resistant.
3. CLighter.
95The magnesium alloys used in aircraft can be recognized by.
1. Ashiny surface due to chromium plated on the surface.
2. Byellowish surface due to protective treatment.
3. Csilver surface due to protective coating.
96Age hardening of aluminium is.
1. Anever carried out.
2. Ba gradual hardening over a period of time.
3. Cnot necessary.
97Alclad is.
1. Aaluminium with duralumin cladding.
2. Bduralumin with aluminium coating.
3. Cduralumin with magnesium cladding
98The oxide film on the surface of aluminium is.
1. Ahard and porous.
2. Bporous.
3. Cnon porous.
99The process of forming a pure layer of aluminium over an aluminium alloy is.
1. Ametalizing.
2. Bcladding.
3. Celectroplating.
100Titanium can be identified by placing it on a grinding wheel and looking for.
1. ARed Sparks.
2. BYellow Sparks.
3. CWhite Sparks
101The critical process of heat treatment is.
1. Atemperature, method of heating and cooling.
2. Btemperature and method of heating only.
3. Cmethod of heating only
102Re-treatment of aluminium alloys can be performed by.
1. Aalocrom treatment.
2. Bbrushing on phosphate treatment followed by paint.
3. Cselenious acid treatment.
103What is generally true for titanium alloy?.
1. AIt is stronger than the aluminium.
2. BIt is stronger than the steel.
3. CIt has lower density than magnesium
104Malleable materials are.
1. Aeasy to forge.
2. Beasy to cast.
3. Chighly ductile.
105If a material has to undergo deep cold forming operation. The essential property would be.
1. Aductility.
2. Bmalleability.
3. Celasticity.
106The metal which must not be heated in a salt bath is.
1. Amagnesium alloy.
2. Bduralumin.
3. Crivets made of alclad.
107The colour code on sheet metal indicates.
1. Aonly the specification of the material.
2. Bthe spec and gauge of the material.
3. Cthat the material is from an approved source
108When two or more metallic materials are fused together, the combination is known as.
1. Aa composite material.
2. Ba thermosetting compound.
3. Can alloy.
109Malleable materials are normally.
1. Aalso highly ductile.
2. Beasy to cast.
3. Ceasily forged.
110The common bonding material for Tungsten Carbide is.
1. AInvar.
2. BCobalt.
3. CSilicon.
111Grain size will effect the mechanical properties of metal. Which of the following is true?.
1. ALarge grain size is attributed to slow cooling rates and will give less tensile strength.
2. BMaterials with large grain size are more prone to creep.
3. CSmall grain size is normally attributed to rapid cooling rates and will give less tensile strength.
112The cracking of structural members under repeated stress lower than the ultimate tensile load is known as.
1. Acreep.
2. Bfatigue failure.
3. Cstress reversal.
113A piece of duralumin has been annealed and bent into shape prior to fitting to an aircraft. Which of the following is correct? It must be.
1. Afitted to the aircraft within 24 hours.
2. Bsolution treated, precipitation treated and fitted to the aircraft within 2 hours.
3. Csolution treated prior to fitting to an aircraft.
114A sheet of metal is designated 2024-T4. The code tells us that the material is a copper based aluminium alloy.
1. Aannealed and Naturally aged.
2. Bsolution treated and naturally aged.
3. Csolution treated and artificially aged.
115A metal is coded 1285 using the IADS coding method. This means the metal is.
1. A85% pure aluminium.
2. B99.85% pure aluminium.
3. Ca copper based aluminium alloy i.e. duralumin
116A material containing approximately 66% nickel and 33% copper is known as.
1. ANimonic.
2. BMonel metal.
3. CInvar
117Monel metal consists of approximately.
1. A66% Chromium and 33% Copper.
2. B66% Copper and 33% Nickel.
3. C66% Nickel and 33% Copper
118Silver solder is composed of the materials.
1. ACopper, Tin and Silver.
2. BZinc, Lead and Silver.
3. CCopper, Zinc and Silver.
119The ease with which a material can be forged, rolled and extruded without fracture is an indication of a material's.
1. Amalleability.
2. Bductility.
3. Cbrittleness.
120What is fatigue?.
1. ACyclic stressing of a part.
2. BFailure of a component due to corrosion.
3. CConstant stressing of a part.
121Why is stop drilling carried out at the end of a crack?.
1. ATo change the direction of the crack.
2. BTo stop the crack from propagating.
3. CTo increase the stress concentration at the crack end.
122Annealing of aluminium.
1. Aincreases the tensile strength.
2. Bmakes the material brittle.
3. Cremoves stresses caused by forming
123In the Brinell hardness test, you would measure the indentation's.
1. Adepth.
2. Barea.
3. Cdiameter.
124The impact testing technique is used on a material to test for.
1. Ahardness.
2. Btoughness.
3. Cshear strain
125An S-N curve is useful in the design evaluation process for testing.
1. Afatigue life.
2. Bshear force.
3. Ctension.
126What is a fusible material?.
1. AThe ability of two dissimilar metals to melt together.
2. BThe ability of a metal to melt.
3. CThe ability of a metal to be welded
127Brittleness is.
1. Athe property to resist wear.
2. Bthe property to not deform before cracking.
3. Cthe property to resist deformation.
128The proof stress of a material is the stress at which.
1. Athe material yields.
2. Bsmall amount of permanent set takes place.
3. Cnecking of the material begins
129Young's Modulus is a measure of.
1. Astrain.
2. Bstress.
3. Cstiffness.
130Hooke's law states that, within the elastic region, elastic strain is.
1. Aindirectly proportional to stress.
2. Bdirectly proportional to stress.
3. Cdirectly opposite to stress.
131The S.I. unit for strain is.
1. ANmm.
2. BP.S.I.
3. Cno units.
132The value of stress for a given material can be derived by.
1. ACross sectional area / Load.
2. BLoad * Cross sectional area.
3. CLoad / Cross sectional area.
133A material's yield strength is the ability to.
1. Awithstand a crushing force.
2. Bresist side loads.
3. Cresist deformation.
134What type of a test involves stretching material until it breaks?.
1. AFatigue Testing.
2. BHardness Testing.
3. CTensile Testing
135Adhesives containing phenol-formaldehyde, to cure, requires.
1. Aroom temperature.
2. Bhigh temperature.
3. Clow temperature
136Two parts of the adhesive process are.
1. Awetting and gripping.
2. Bspreading and setting.
3. Cwetting and setting.
137Types of adhesive joints are.
1. Amechanical and cemented.
2. Bcemented and specific.
3. Cmechanical and specific
138What material would be used where a high temperature application is required, e.g. a firewall?.
1. AAramid (Kevlar) fibres.
2. BCarbon/graphite fibres.
3. CCeramic fibres
139Over extended honeycomb can bend in which direction?.
1. AIn all directions.
2. BAcross the ribbon.
3. CAlong the ribbon.
140Fibre weave strength is greatest in the direction of the.
1. Aweft.
2. Bwarp.
3. Cbias.
141What is Alumina?.
1. AAn alloy of aluminium.
2. BAluminium ore.
3. CA ceramic oxide of aluminium
142Which of these core materials will be used in the making of a composite material flat panel?.
1. AHexagonal core.
2. BRectangular core.
3. CFlexible core.
143Which of the following could best be manufactured from Perspex panel?.
1. AA passenger window.
2. BA radome.
3. CA cockpit windscreen
144Kevlar and Nomex are types of.
1. Aglass fibre composite.
2. Badvanced composite.
3. Caluminium alloy
145Strength of fibreglass is.
1. Aeither direction.
2. Balong the fibre.
3. Cacross the fibre
146A composite flap panel has structural damage. What NDT method will you use to detect?.
1. AHigh voltage x-ray.
2. BLow voltage x-ray.
3. CCoin tap test.
147Sound is best absorbed by a material which is.
1. Adense.
2. Bsoft and porous.
3. Chard
148The maximum tensile strength of fibre reinforced plastic is achieved using.
1. Afibres uniformly distributed at 45 degrees to each other.
2. Bunidirectional fibres.
3. Cchopped strand mat.
149Polyester resin and glass fibre cloth, becomes.
1. APTFE.
2. BPVC.
3. CGRP
150A thermoplastic can be.
1. Aheated and formed only once.
2. Bis not affected by even low temperatures.
3. Ccan be reheated and reformed more than once.
151An impact adhesive is part of the.
1. Athermoplastic group.
2. Bthermoset group.
3. CAnaerobic resin group
152Sandwich panels made of metal honeycomb construction are used on modern aircraft because this type of construction.
1. Amay be repaired by gluing replacement skin to the inner core material with thermoplastic resin.
2. Bis lighter than single sheet skin of the same strength and is more corrosion resistant.
3. Chas a high strength to weight ratio.
153A category of plastic material that is capable of softening or flowing when reheated is described as a.
1. Athermoset.
2. Bthermoplastic.
3. Cthermocure.
154The classification of high tensile strength fibreglass used in aircraft structures is.
1. AG-glass.
2. BE-glass.
3. CS-glass.
155Which is the identifying characteristic of acrylic plastics?.
1. AAcetone will soften the plastic, but will not change its colour.
2. BHas a yellowish tint when viewed from the edge.
3. CZinc chloride will have no effect.
156The classification for fibreglass reinforcement material that is high resistivity and the most common is.
1. AE-glass.
2. BS-glass.
3. CG-glass.
157Composite fabric material is considered to be the strongest in what direction?.
1. AWarp.
2. BBias.
3. CWeft
158Which of the following are generally characteristic of aramid fibre (Kevlar) composites?.
1. AHigh tensile strength and flexibility.
2. BFlexibility, stiffness and corrosive effect in contact with aluminium.
3. CHigh tensile strength, stiffness and ability to conduct electricity
159Which of the following are generally characteristic of carbon/graphite fibre composites?.
1. AFlexibility, High compressive strength and ability to conduct electricity.
2. BFlexibility and high compressive strength.
3. CStiffness, high compressive strength and corrosive effect in contact with aluminium
160Which of the following statements is true about thermosetting plastics?.
1. AThey are also known as Teflon.
2. BOnce moulded into shape they become set and cannot subsequently be softened by reheating.
3. CThey become plastic when heat is applied
161Which of the following is susceptible to the ingress of moisture?.
1. AGlass fibre.
2. BCarbon fibre.
3. CKevlar
162What tests are done on adhesive joints?.
1. AShear and peel.
2. BImpact and peel.
3. CImpact and shear.
163When using a hot bonder to effect a composite repair, you use.
1. Ainorganic resin adhesives.
2. Borganic resin adhesives.
3. Csynthetic resin adhesives.
164In a composite repair lay-up, how much should each layer extend beyond the layer below it?.
1. A3 - 4 inches.
2. B1 - 2 inches.
3. C2 - 3 inches.
165What is the effect of heat on a cold cure resin?.
1. ANo effect on pot life.
2. BDecrease pot life.
3. CIncrease pot life.
166 If you increase the amount of catalyst in a resin mixture,.
1. Athe material will become stronger.
2. Bthe material will become weaker.
3. Cthe pot life will be decreased.
167 What two components of a three part polyester resin are dangerous to mix together directly?.
1. AAccelerator and free catalyst.
2. BCatalyst and resin.
3. CAccelerator and resin.
168What is the effect of adding too much hardener to a resin?.
1. ANo effect.
2. BMakes the repair more brittle.
3. CThe resin will not harden.
169What is the largest hole in honeycomb repairable with microballoons?.
1. A2.54 inches.
2. B2.54 mm.
3. C2.54 cm.
170An air driven router is used to remove honeycomb material for repairs.
1. Awhen one outer skin is damaged.
2. Bto stainless steel honeycomb only.
3. Cwhen both outer skins are damaged.
171Where would you use a Templestick?.
1. AFor the boundary marking of a composite repair.
2. BTo indicate temperature when a repaired composite item is cured with heat lamps.
3. CAs a temporary repair in a glass fibre internal.
172The vacuum connections on a fibreglass repair must be placed onto the.
1. Atop layer of glass fabric directly.
2. Bbreather mat.
3. Cpeel ply.
173What do you do if you forget to add hardener to a composite repair?.
1. AAdd hardener at the edges and it will cure.
2. BIt will cure eventually anyway.
3. CRemove all resin and start again
174Why would you use microballoons as a filler?.
1. AIt is the lightest filler material.
2. BIt is the cheapest filler material.
3. CIt cross-links with the panel
175When using a backing former on a composite repair you need to use.
1. Aa vacuum bag.
2. Bcellophane.
3. Cbreather cloth
176Heater mats should overlap the repair by.
1. A4 inches.
2. B6 inches.
3. C2 inches.
177 A thermoplastic fibre reinforced composite is prepared by.
1. Aa solvent wipe.
2. Bcorona method.
3. Cetching
178During vacuum bag lay-up the vacuum gauge is placed where?.
1. ANext to the vacuum port.
2. BOpposite side to the vacuum port.
3. COver the repair.
179Stepped curing has.
1. A2 or more arrest points.
2. Bno arrest point.
3. C1 arrest point.
180Maximum repair dimensions for use of microballoons is.
1. A10mm.
2. B20mm.
3. C30mm
181In an autoclave what pressure would the vacuum alarm be set at?.
1. AOperating pressure.
2. BHigher than operating pressure.
3. CLower than operating pressure
182In an autoclave what would you cover the repair in?.
1. AHigh temp nylon.
2. BPolypropelene.
3. CPolythene.
183When mixing resin it is dangerous to add.
1. Aaccelerator and catalyst before resin.
2. Bcatalyst and resin before accelerator.
3. Cresin and accelerator before catalyst
184In an autoclave, to apply pressure.
1. Aa vacuum bag is used.
2. Bweights are used.
3. Cclamps are used.
185What does MSDS stand for?.
1. AMetal Surface Dimension Sector.
2. BMaterial Safety Data Sheet.
3. CMaximum Structural Design System
186Honeycomb for repair can be removed with.
1. Aa drill.
2. Blocally manufactured concave knife.
3. Ca router
187The pot life of a cold cured resin.
1. Ais not reliant upon temperature fluctuations.
2. Bdecreases with an increase in temperature.
3. Cincreases with increase of temperature.
188Thermosetting adhesive, during their curing cycle give off.
1. Astatic radiation.
2. Bheat.
3. Ccarbon monoxide.
189The effect of a lower temperature than ambient during the curing period of a resin, will cause the curing time to.
1. Adecrease.
2. Bincrease.
3. Cremain unchanged.
190What is used as the base covering on a honeycomb repair?.
1. AGlass cloth or thin aluminium sheet.
2. BThick aluminium sheet.
3. CPlywood.
191When drilling a carbon fibre reinforced plastic use.
1. Aa steel drill and carbarundum powder.
2. Ba tungsten drill with a pointed tip.
3. Ca tungsten carbide drill.
192When laying up a glass fibre repair, the extra layer of fibre is.
1. Aa sacrificial layer for sanding.
2. Bfor extra strength.
3. Cfor shrinkage
193Bubbles are removed from a wet composite lay-up by.
1. Aapplication of pressure.
2. Buse of a roller.
3. Capplication of vacuum.
194Use of excessive hardener in polyester resin leads to.
1. Aa less stiff joint.
2. Breduced pot life.
3. Cstiffer joint.
195When the temperature increases on a hot bond repair is paused it is known as.
1. Aarrest point.
2. Bramping down.
3. Cramping up
196Slight waviness on a fibre composite structure.
1. Amay cause fatigue crack eventually.
2. Bmay be tolerable if lightly loaded.
3. Ccould be reinforce with additional plies over the weakened area.
197The maximum length of time a component is held in stores is known as the.
1. Apackage life.
2. Bstorage life.
3. Cshelf life
198On a pre-preg composite.
1. Alife can be extended by 12 months if stored below 10 °C.
2. Blife can be extended by 12 months if stored above 40 °C.
3. Cno life extension is allowed, it must be used immediately.
199Hot bond composite pane has a crack. When it reaches the ribbon it will.
1. Acarry on along the ribbon.
2. Bhave no effect on its direction.
3. Cstop.
200In an autoclave the air is removed by.
1. Apressure.
2. Broller.
3. Cvacuum.

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Descrição: Quiz sobre Materiales hardware, criado por oriol arrufat em 03-08-2018.
Autor: oriol arrufat
Idioma: English
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