Mancomunidad 6

Which mechanical properties are changed when steel is tempered?. Steel is tempered to increase brittleness. Steel is tempered to increase hardness. Steel is tempered to reduce the brittleness.

What does the pearlite microstructure of steel consist of?. Pearlite is ferrite and cementite. Pearlite is ferrite and graphite. Pearlite is graphite and cementite.

What must be done to get a hardness value from a Rockwell hardness test?. To get a hardness value from a Rockwell hardness test, the indication is read directly from a dial on the machine. To get a hardness value from a Rockwell hardness test, measure accurately the diameter of the indent made in the test piece. To get hardness value from a Rockwell hardness test, measure accurately the depth of the indent made in the test piece.

When does creep occur?. Creep occurs as a result of a material's exposure to high temperature only. It is not affected by stress. Creep occurs as a result of a material's exposure to high temperature and high tensile stress. Creep occurs as a result of a material's exposure to high tensile stress only. It is not affected by temperature.

Which type of penetrant fluoresces when illuminated with an ultraviolet lamp?. Type 1 penetrant fluoresces when illuminated with an ultraviolet lamp. Type 2 penetrant fluoresces when illuminated with an ultraviolet lamp. Type 3 penetrant fluoresces when illuminated with an ultraviolet lamp.

Which of the following chemicals is commonly used to remove rust from ferrous components?. Phosphoric acid is commonly used to remove rust from ferrous components. Selenous acid is commonly used to remove rust from ferrous components. Nitric acid is commonly used to remove rust from ferrous components.

Which is more flexible if two steel control cables are of the same outside diameter?. The 19 wire cable is more flexible than the 7 wire cable. The 7 wire cable is more flexible than the 19 wire cable. Both cables are equally flexible since they are the same diameter.

What is a 'preformed' control cable?. A 'preformed' control cable is supplied with the end fittings already attached to the cable. A 'preformed' control cable has each cable strand formed into the shape that it will take up in the completed cable. A 'preformed' control cable is pretensioned to prevent slack when it is fitted to the aircraft system.

How is the left hand thread on a turnbuckle often identified?. The left hand thread on a turnbuckle is identified with a colour band. The left hand thread on a turnbuckle is identified with a letter 'L' marking. The left hand thread on a turnbuckle is identified with a groove or knurl.

When is a British type turnbuckle 'in safety’?. A British type turnbuckle is in safety when a steel pin passes through the safety inspection hole. A British type turnbuckle is 'in safety' when all of the fitting thread is engaged in the barrel. A British type turnbuckle is 'in safety' when a steel pin does not pass through the safety inspection hole.

How are cable fairleads usually lubricated?. Cable fairleads should never be lubricated with oil nor grease. Cable fairleads should be lubricated periodically with grease. Cable fairleads should be lubricated periodically with light oil.

What type of electrical wire is used to conduct large currents over long distances?. Tinned copper wire is used to conduct large currents over long distances. Aluminium wire is used to conduct large currents over long distances. Steel wire is used to conduct large currents over long distances.

Compared to other types of electrical connections, crimping does NOT have the advantage of what property?. Crimping does NOT have good conductivity. Crimping is NOT corrosion proof. Crimping is NOT possible to assemble without tools.

Which of these statements is true regarding nickel plated crimping terminal colour code identification?. Nickel plated crimping terminals have a colour code identification. Nickel plated crimping terminals do not have a colour code identification. Nickel plated crimping terminals need to be colour coded before installation.

What thickness is an interconnect cable insulation, compared to the thickness of an airframe cable insulation?. An interconnect cable insulation is thinner than airframe cable insulation. An interconnect cable insulation is the same thickness as airframe cable insulation. An interconnect cable insulation is thicker than airframe cable insulation.

How are restricted entry ring tongue terminals identified?. Restricted entry ring tongue terminals are identified with coloured dots on the barrel insulator. Restricted entry ring tongue terminals are identified with thin coloured bands along the barrel insulator. Restricted entry ring tongue terminals are identified with a part number and barrel insulator colour.

What type of cable is Tersil, and how is it identified?. Tersil is a fire resistant cable having greater flexibility than Nyvin; Exterior finish is orange. Tersil is a fire proof cable having greater flexibility than Nyvin; Exterior finish is orange. Tersil is a fire resistant cable having greater flexibility than Nyvin; Exterior finish is blue.

What is the Bayer process used for?. The Bayer process used to convert alumina to aluminium. The Bayer process used to convert bauxite to aluminium. The Bayer process used to convert bauxite to alumina.

Which aluminium alloy is 'Duralumin'?. 'Duralumin' is an older name for the 2000 series of aluminium alloy. 'Duralumin' is an older name for the 3000 series of aluminium alloy. 'Duralumin' is an older name for the 6000 series of aluminium alloy.

What type of titanium is used for primary aircraft structures (skins and spars etc.)?. A-55 titanium is used for primary aircraft structures. A-70 titanium is used for primary aircraft structures. C-110M titanium is used for primary aircraft structures.

Which aluminium alloys cannot be hardened by heat treatment?. 1000, 3000, 4000 and 6000 series aluminium alloys cannot be hardened by heat treatment. 1000, 3000, 4000 and 5000 series aluminium alloys cannot be hardened by heat treatment. 1000, 2000, 4000 and 5000 series aluminium lloys cannot be hardened by heat treatment.

What is the effect on the fatigue life if an aluminium alloy component is operated below the fatigue limit?. The fatigue life is infinite, if the component is operated below the fatigue limit. The fatigue life is finite, if the component is operated below the fatigue limit. The fatigue life is zero, if the component is operated below the fatigue limit.

What mechanical property is indicated by Impact tests on non-ferrous metals?. Impact tests indicate the hardness of a metal. Impact tests indicate the shear strain of a metal. Impact tests indicate the toughness of a metal.

What conditions maximise creep of a non-ferrous metal?. Low stress and low temperature maximises creep. High stress and high temperature maximises creep. High stress and low temperature maximises creep.

Which ATA chapter of the Aircraft Maintenance Manual is used for standard repair details of aircraft structures?. Chapter 51. Chapter 12. Chapter 20.

Which abrasive tools must never be used on aluminium or magnesium alloy structures to remove corrosion?. Silicon carbide abrasive, steel brushes and steel wool must never be used on aluminium or magnesium alloys. Scotch Brite abrasive and cleaning pads must never be used on aluminium or magnesium alloys. Glass bead or aluminium oxide blast or paper must never be used on aluminium or magnesium alloys.

What advantage does aramid fibre have over other fibre types?. Aramid fibre structures have superior impact strength. Aramid fibre structures are resistant to UV light. Aramid fibre structures have superior flame resistance.

Which type of woven fabric is least pliable (least able to conform to small radius curvature), but easiest to cut and handle because they do not tend to unravel?. Plain weave is least pliable, but easiest to cut and handle. Twill weave is least pliable, but easiest to cut and handle. Satin weave is least pliable, but easiest to cut and handle.

What process occurs to cure and harden the thermosetting resin?. A thermosetting resin hardens and cures by evaporation of moisture. A thermosetting resin hardens and cures by conversion of oxygen. A thermosetting resin hardens and cures by chemical cross-linking.

What is a general characteristic of carbon fibre composites?. Carbon fibre composites have high tensile strength and high impact strength. Carbon fibre composites have high tensile strength, high compressive strength and high impact strength. Carbon fibre composites have high tensile strength, high compressive strength.

Why may physical damage in composite structures be hard to detect?. Physical damage may be hard to detect, since no evidence is left on the surface often after impact. Physical damage may be hard to detect, since the surface often springs back to its original shape after impact. Physical damage may be hard to detect, since most part of the damage lays deep under the surface after impact.

What is the name given to the composite structure damage described as the separation of composite panel plies?. Delamination is the separation of composite panel plies of a composite structure. Disbonding is the separation of composite panel plies of a composite structure. Detachment is the separation of composite panel plies of a composite structure.

What are the common methods of non-destructive testing of composite materials?. Tap test, infrasonic inspection, radiography/x-ray, thermal imaging are the common methods of non-destructive testing of composite materials. Tap test, ultrasonic inspection, radiography/x-ray, vibration methods, thermal imaging are the common methods of nondestructive testing of composite materials. Tap test, ultrasonic inspection, radiography/x-ray, vibration methods, thermal radiography are the common methods of nondestructive testing of composite materials.

Which NDT method can only reveal gross water damage and delamination?. Radiography can only reveal gross water damage and delamination. Thermal imaging can only reveal gross water damage and delamination, only. Ultrasonic inspection can only reveal gross water damage and delamination.

What is the purpose of the application of a vacuum bag when curing a composite structure repair?. It ensures that atmospheric pressure forces the repair patches together and evacuates all trapped air from the repair. It ensures all air is evacuated from the repair because trapped air inhibits the curing of the resin matrix. It ensures the temperature of the repair area is able to reach the necessary level as required for the resin matrix to cure properly.

What type of wood is aircraft-grade plywood normally made of?. Aircraft-grade plywood is made of fir wood veneers bonded together. Aircraft-grade plywood is made of birch wood veneers bonded together. Aircraft-grade plywood is made of oak wood veneers bonded together.

Which of the following glues must be used with an acid catalyst/hardener?. Casein glues must be used with an acid catalyst/hardener. Plastic resin glues must be used with an acid catalyst/hardener. Resorcinol glues must be used with an acid catalyst/hardener.

What shape are the access holes in wood aircraft structures, normally?. Access holes in wood aircraft structures are normally rectangular. Access holes in wood aircraft structures are normally circular.. Access holes in wood aircraft structures are normally triangular.

What is a 'splitting test' used for on a wooden aircraft structure?. To confirm the true grain direction of the wood. To check the brittleness of the wood. To check the hardness of the wood.

What can be done if the fabric on a fabric covered aeroplane loses its strength?. 1 or 2 additional coats of dope should be applied to the old fabric. The fabric should be removed entirely and replaced with new fabric. The fabric should be patched in the weak areas with new fabric.

Which of the following materials is NOT susceptible to damage from moisture?. Cotton is NOT susceptible to damage from moisture. Linen is NOT susceptible to damage from moisture. Glass fibre is NOT susceptible to damage from moisture.

Which of the following is the most likely cause of excessive tension in aircraft fabric?. Excessive dope film on new covering is the most likely cause of excessive tension in aircraft fabric. Inadequate dope film is the most likely cause of excessive tension in aircraft fabric. Exposure to UV radiation is the most likely cause of excessive tension in aircraft fabric.

What inspection method is used for identifying excess tension in aircraft fabric covering?. By removing and testing a fabric sample. By ultrasonic inspection techniques. By visual inspection only.

Which part corrodes in the galvanic action process?. The anode always corrodes, in the galvanic action process. The cathode always corrodes, in the galvanic action process. Both the anode and the cathode always corrode, in the galvanic action process.

What are the components necessary for galvanic action to take place?. An anode, a cathode and an electrolyte are required to be in contact with each other, for galvanic action to take place. An anode and a cathode only, are required to be in contact with each other, for galvanic action to take place. Any anodic material in contact with an electrolyte is all that is required for galvanic action to take place.

What causes microbiological corrosion?. Microbiological corrosion is primarily caused by chemical reactions with acids. Microbiological corrosion is primarily caused by oxidation-reduction reactions. Microbiological corrosion is primarily caused by biological organisms.

How may pitting corrosion be detected?. Pitting corrosion may be detected by measuring the thickness of the material. Pitting corrosion may be detected through discolouration of the entire metal surface. Pitting corrosion may be detected by the appearance of white powder or small depressions on the surface.

What type of corrosion is indicated by bulging or pillowing of aircraft skin between fasteners?. Pitting corrosion is indicated by bulging or pillowing of aircraft skin between fasteners. Crevice corrosion is indicated by bulging or pillowing of aircraft skin between fasteners. Intergranular corrosion is indicated by bulging or pillowing of aircraft skin between fasteners.

What type of corrosion can be found in ni-cad battery compartments?. Akali chemical corrosion. Acid chemical corrosion. Solvent chemical corrosion.

What can cause filiform corrosion?. Trapped acid in paint coatings can cause filiform corrosion. Incorrect rivet formation can cause filiform corrosion. Incorrect heat treatment can cause filiform corrosion.

Which metal is more susceptible to embrittlement from cadmium even at ambient temperatures?. Iron and steel are more susceptible to embrittlement from cadmium even at ambient temperatures. Magnesium alloys are more susceptible to embrittlement from cadmium even at ambient temperatures. Titanium is more susceptible to embrittlement from cadmium even at ambient temperatures.

What thread angle does a BA thread have?. A BA thread has a thread angle of 29 degrees. A BA thread has a thread angle of 55 degrees. A BA thread has a thread angle of 47 1/2 degrees.

Why are left-hand (LH) threads used on certain rotating parts like drive shafts?. Left-hand (LH) threads are used on certain rotating parts like drive shafts because they tighten with clockwise rotation unlike right-hand threads. Left-hand (LH) threads are used on certain rotating parts like drive shafts to ensure that normal rotation tends to loosen rather than tighten them. Left-hand (LH) threads are used on certain rotating parts like drive shafts because normal angular rotation would tend to tighten them.

What is meant by the 'pitch' of a screw thread?. The 'pitch' of a screw thread is the diameter of an imaginary cylinder passing through the threads at their widest part. The 'pitch' of a screw thread is the axial advance of the thread per one complete turn. The 'pitch' of a screw thread is the included angle between the flanks measured in any plane other than axial.

What class of fit are usually aircraft bolts?. Aircraft bolts are usually Class 3 fit. Aircraft bolts are usually Class 2 fit. Aircraft bolts are usually Class 1 fit.

What is the purpose of an enlarged bearing surface on one side of some nuts?. The purpose of an enlarged bearing surface on one side of some nuts is to reduce the weight of the nut. The purpose of an enlarged bearing surface on one side of some nuts is to ensure proper alignment in structural applications. The purpose of an enlarged bearing surface on one side of some nuts is to increase the contact area for load distribution.

What is unique about the design of a waisted stud?. The design of a waisted stud is unique because it has threads on one end only. The design of a waisted stud is unique because the plain portion diameter is reduced compared to the threaded ends. The design of a waisted stud is unique because it features an integral shoulder for better alignment.

Which type of nut is a lightweight pressed-steel nut which contains only a partial thread and is usually used for non-structural purposes. Stiffnuts are a lightweight pressed-steel nut which contains only a partial thread and is usually used for non-structural purposes. Wingnuts are a lightweight pressed-steel nut which contains only a partial thread and is usually used for non-structural purposes. Pal nuts are a lightweight pressed-steel nut which contains only a partial thread and is usually used for non-structural purposes.

Where are 'flush head' machine screws used?. 'Flush head' machine screws are used as cap screws. 'Flush head' machine screws are used in tapped holes. 'Flush head' machine screws are used in countersunk holes.

What nut type has more than one anchor nut attached to a plate?. Strip nuts have more than one anchor nut attached to a plate. Clip nuts have more than one anchor nut attached to a plate. Sheet spring nuts have more than one anchor nut attached to a plate.

Why might one choose a fillister-head machine screw over other types?. One might choose a fillister-head machine screw over other types because it provides good holding properties on thin metal sheets. One might choose a fillister-head machine screw over other types because it is designed for applications requiring high-strength precision products. One might choose a fillister-head machine screw over other types because it is used as general-purpose screws and may also be wire-locked.

What does the Camloc fastener consist of?. The Camloc fastener consists of a rubber washer and a two-legged spring clip. The Camloc fastener consists of a spring-loaded stud assembly and a receptacle. The Camloc fastener consists of a bullet-shaped central stud and a spring clip.

What is used along with clevis pins to accommodate a retention device?. Taper pins are used along with clevis pins to accommodate a retention device. Split pins are used along with clevis pins to accommodate a retention device. Screws are used along with clevis pins to accommodate a retention device.

How can you differentiate between a 1100 aluminium rivet, a mild steel rivet, and a copper rivet if they all have plain heads?. By their weight. By their colour. By the length of the shank.

What is the primary reason for using hollow rivets known as 'blind' rivets in aircraft repairs?. The primary reason for using hollow rivets known as 'blind' rivets in aircraft repairs is they are easier to manufacture. The primary reason for using hollow rivets known as 'blind' rivets in aircraft repairs is they can be used when only one side of the job is accessible. The primary reason for using hollow rivets known as 'blind' rivets in aircraft repairs is they are suitable for load-bearing joints.

A rivet made from '5056' alloy is the preferred rivet for joining sheet metal of what type?. A '5056 alloy rivet is the preferred rivet for joining aluminium alloy sheet metal. A '5056' alloy rivet is the preferred rivet for joining steel sheet metal. A '5056' alloy rivet is the preferred rivet for joining magnesium alloy sheet metal.

What is used when two flared pipes need to be connected pipe-to-pipe?. A nipple with two cones is used when two flared pipes need to be connected pipe-to-pipe. A nut with 2 threads is used when two flared pipes need to be connected pipe-to-pipe. A sleeve and rubber seals is used when two flared pipes need to be connected pipe-to-pipe.

How are AN steel fittings coloured?. AN steel fittings are coloured black. AN steel fittings are coloured blue. AN steel fittings are coloured yellow.

What colour are 'AN' flared pipe fittings?. 'AN' flared pipe fittings are always black. 'AN' flared pipe fittings are always blue. 'AN' flared pipe fittings are either black or blue.

What is meant by the term 'Spring index'?. 'Spring index' is the ratio of mean coil diameter to wire diameter, C = D/d. 'Spring index' is the distance from centre to centre of the wire in adjacent active coils. 'Spring index' is the ratio of wire diameter to mean coil diameter, D = C/d.

Which bearing can compensate for the linear expansion of a rotating shaft in a housing?. By use of roller bearings. By use of ball bearings. By use of spherical bearings.

What type of thrust bearing is used to compensate for a small amount of shaft or surface misalignment?. Spherical thrust bearing compensates for a small amount of shaft or surface misalignment. Tapered thrust bearing compensates for a small amount of shaft or surface misalignment. Cylindrical thrust bearing compensates for a small amount of shaft or surface misalignment.

What is a rod-end bearing designed for?. A rod-end bearing is designed for continuous rotational movement and angular alignment. A rod-end bearing is designed for angular alignment only. A rod-end bearing is designed for continuous rotational movement only.

What rings are required to be used with needle roller bearings?. Needle roller bearings can be used only with both the inner and the outer ring. Needle roller bearings can be used without an outer ring, but must have an inner ring. Needle roller bearings can be used without an inner ring and without an outer ring.

What is a compounded gear driveshaft?. A compounded gear driveshaft is a gear which is not wet lubricated with oil or grease. A compounded gear driveshaft is a gear which has more than one gear attached. A compounded gear driveshaft is a gear which drives in two directions at the same time.

What is the purpose of an idler gear in a gear train?. An idler gear always reduces the gear ratio from the driving to the driven gears. An idler gear changes the direction of rotation of the driven gear. An idler gear increases the load carrying capacity of the gear train.

What is a disadvantage of chain drives that might affect drive system design?. Noise is usually higher than with belts or gears. Slippage between chain and sprocket teeth is likely. Chains can elongate due to the wearing of link and sprocket teeth contact surfaces.

What is the difference between the non-reversible chains and standard chains?. Non-reversible chains have an outer plate that is extended in both directions in order to break up the symmetry of the chain. Non-reversible chains have an outer plate that is extended in one direction in order to break up the symmetry of the chain. Non-reversible chains have an outer plate that is extended in both directions in order to break up the asymmetry of the chain.

What do the first two digits of the AISI classification system of steel indicate?. The first two digits of the AISI classification system of steel indicate the percentage of carbon in the steel. The first two digits of the AISI classification system of steel indicate the principal alloying element in the steel. The first two digits of the AISI classification system of steel indicate the corrosion resistance of the steel.

How is the correct cooling process during annealing and normalizing of steel achieved?. Cool slowly to anneal, cool freely in air to normalize. Cool in air to anneal, cool in water or oil to normalize. Cool in air to anneal, cool slowly to normalize.

How is Fatigue failure defined?. Fatigue failure is a failure caused by stress that is much higher than material's ultimate tensile stress. Fatigue failure is a failure due to impact or sudden shock load such as a bird or stone impact. Fatigue failure is a progressive deterioration of the strength of a material due to alternating loads.

How are discontinuities in ferrous metals detected using magnetic particle flaw detection (MPFD)?. Discontinuities in ferrous metals are detected by applying a powder containing ferromagnetic particles. Discontinuities in ferrous metals are detected by establishing a magnetic field perpendicular to the component. Discontinuities in ferrous metals are detected by passing an electrical current through the component.

How are eddy currents induced in conductive materials when carrying out eddy current flaw detection?. Eddy currents are induced in conductive materials by an alternating magnetic field. Eddy currents are induced in conductive materials by a direct electrical current. Eddy currents are induced in conductive materials by an electromagnetic pulse.

How are control cables classified?. Control cables are classified by their minimum breaking load and nominal diameter. Control cables are classified by their circumference and length. Control cables are classified by their number of wires in a strand.

How are control cables of American and European manufacture classified?. Control cables of American and European manufacture are classified by their number of strands. Control cables of American and European manufacture are classified by their nominal diameter. Control cables of American and European manufacture are classified by their weight per 10 metre length.

How is a flexible control cable end fitting swaged with a Nicopress tool tested for adequate deformation?. A tensile test is used to test for adequate deformation of an end fitting on a flexible control cable. Inspecting for cracks is used to test for adequate deformation of an end fitting on a flexible control cable. A go/no-go gauge is used to test for adequate deformation of an end fitting on a flexible control cable.

When is an American type turnbuckle in safety?. An American type turnbuckle is in safety when none of the fitting thread is not engaged in the barrel. An American type turnbuckle is in safety when all of the fitting thread is engaged in the barrel. An American type turnbuckle is in safety when a steel pin does not pass through the safety inspection hole.

What is the purpose of the screening on a coaxial cable?. The screening on a coaxial cable is to prevent electrical fire. The screening on a coaxial cable is to prevent induced HIRF into the core cable. The screening on a coaxial cable is to prevent EMFs radiating out from the core cable and it prevents induced EMFs into the core cable.

What are the primary considerations when selecting an electric cable size?. The primary considerations when selecting an electric cable size is the voltage and the amperage of the load it must carry. The primary considerations when selecting an electric cable size is the system voltage and cable diameter. The primary considerations when selecting an electric cable size is the current-carrying capacity, allowable voltage drop and flexibility.

What factor(s) affect the aircraft manufacturers choice of insulation for aircraft conductors?. Only the current rating affects the aircraft manufacturers choice of insulation for aircraft conductors. Only current rating and voltage rating affect the aircraft manufacturers choice of insulation for aircraft conductors. Current rating, voltage rating and operating environment, all affect the aircraft manufacturers choice of insulation for aircraft conductors.

What type of insulation cannot be stripped with thermal strippers?. PTFE insulation cannot be stripped with thermal strippers. PVC insulation cannot be stripped with thermal strippers. Silicon rubber insulation cannot be stripped with thermal strippers.

Transmission line in co-axial cable consists of what cable and conductor construction?. Transmission line in co-axial cable is constructed as one cable/conductor that is insulated from each other. Transmission line in co-axial cable is constructed as three cables/conductors that are insulated from each other. Transmission line in co-axial cable is constructed as two cables/conductors that are insulated from each other.

How are non-heat treatable aluminium alloys hardened?. Non-heat treatable aluminium alloys can be hardened by annealing. Non-heat treatable aluminium alloys can be hardened by strain hardening. Non-heat treatable aluminium alloys cannot be hardened.

What type of metal is 'Invar'l?. 'Invar' is a nickel alloy known for its low thermal expansion property. 'Invar' is a nickel alloy known for its low electrical resistance property. 'Invar' is a magnesium alloy known for its high corrosion resistance.

The 6000 series of aluminium alloy has what principle alloying element(s)?. Magnesium only, is the principle alloying element in the 6000 series of aluminium alloy. Silicon only, is the principle alloying element in the 6000 series of aluminium alloy. Magnesium and silicon is the principle alloying element in the 6000 series of aluminium alloy.

What can fatigue tests be used for?. On individual components. On complete aircraft structures. Individual components and complete aircraft structures.

How is a creep test of a non-ferrous metal done?. A creep test of a non-ferrous metal is carried out under high tensile stress only. A creep test of a non-ferrous metal is carried out under high temperature only. A creep test of a non-ferrous metal is carried out under high stress and high temperature.

What is the base chemical in Deoxidine?. The base chemical in Deoxidine is phosphoric acid. The base chemical in Deoxidine is sulphuric acid. The base chemical in Deoxidine is nitric acid.

What is a consideration regarding the difference between 'S' glass fibre and 'E' glass fibre?. 'S' glass fibre has greater strength than 'E' glass fibre, but lower electrical insulation ical insulation properties than 'E' glass fibre. 'S' glass fibre has lower strength than 'E' glass fibre, but greater electrical insulation properties than 'E' glass fibre. 'S glass fibre is approximately the same strength as 'E' glass fibre, but greater electrical insulation properties than 'E' glass fibre.

Which direction does a unidirectional carbon or glass fibre fabric weave has superior strength in?. A unidirectional weave has superior strength in both the warp and the weft directions of the fabric. A unidirectional weave has superior strength only in the warp direction. It has no strength in the weft direction. A unidirectional weave has superior strength only in the weft direction. It has no strength in the warp direction.

What is the effect of adding too much resin and too little hardener When mixing resin?. Composite structure strength will be weak/brittle if too much resin and too little hardener is used. There will be no adverse effect on the composite structure if too much resin and too little hardener is used. The resin will not harden fully and will compromise the strength if too much resin and too little hardener is used.

Which manual includes specific repair instructions and limitations of damage of composite structures!?. The Maintenance Manual provides specific repair Instructions and limitations of damage of composite structures. The Standard Practices Manual provides specific repair instructions and limitations of damage of composite structures. The Structural Repair Manual provides specific repair instructions and limitations of damage of composite structures.

Where micro-cracks usually occur?. Micro cracks usually occur in the surface of the resin or the paint. Micro cracks usually occur in the surface of the resin, only. Micro cracks usually occur in the laminate layers, only.

Which types of defects are visible on non-metallic surfaces?. Disbonding and delamination are visible on non-metallic surface. Micro and major cracks are visible on non-metallic surface. Delaminations and cracks are visible on non-metallic surface.

How is damage identified during a coin tap test of a composite laminate structure?. Damage is identified during a coin tap test by a resonant tone or 'click' at the area of tapping. Damage is identified during a coin tap test by a flat, dead tone or 'thud' at the area of tapping. Damage is identified during a coin tap test by a no sound returned at the area of tapping.

What is a necessary step for composite structure repairs with thin sections and large sandwich structures?. Applying a vacuum bag is a necessary step for high-quality repairs with thin sections and large sandwich structures. Applying a portable hot bonder is a necessary step for high-quality repairs with thin sections and large sandwich structures. Using an autoclave is a necessary step for high-quality repairs with thin sections and large sandwich structures.

What is the danger associated with the cutting or grinding of Kevlar structures with high-speed tools?. Because of the fuzzy nature of Kevlar, it tends to grab at the surface of high-speed tools and pull the sanding disks or cutter from the power tool's jaws. Because of the low melting temperature of Kevlar, it tends to melt quickly, causing distortion of the structure and clogging of the cutting disk or tool. Because of the toxicity of Kevlar dust, extensive personal protective equipment such as masks, and the use of extraction equipment is essential.

How is the growth rate of timber indicated?. The growth rate of timber indicated by the number of annual growth rings in the timber. The growth rate of timber indicated by the thickness of the timber. The growth rate of timber indicated by the length of the timber.

What is the concern regarding the long-term durability of epoxy resins when exposed to certain conditions?. Moisture deterioration. Fungal attack. High temperatures.

What is the non-fraying edge of the fabric called?. The non-fraying edge of the fabric is called the Bolt. The non-fraying edge of the fabric is called the Weft. The non-fraying edge of the fabric is called the selvedge.

What is the purpose of using anti-chafe tape in the inspection of aircraft structures?. The purpose of using anti-chafe tape in the inspection of aircraft structures is to enhance the aesthetic appeal of the aircraft. The purpose of using anti-chafe tape in the inspection of aircraft structures is to cover sharp edges and projections that may damage the fabric. The purpose of using anti-chafe tape in the inspection of aircraft structures is to increase the aerodynamic efficiency of the aircraft.

When can 'darning' be used as a repair method in aircraft fabric covering?. 'Darning' is used when a small hole in the fabric needs to be repaired. 'Darning' is used when the fabric has detached from the wood structure. 'Darning' is used when there are loose patches on the surface of the fabric.

Which of the following metals are strongly resistant to corrosion?. Iron and steel are strongly resistant to corrosion. Copper and zinc are strongly resistant to corrosion. Aluminium and titanium are strongly resistant to corrosion.

How does the presence of a corrosive environment on a stressed structural alloy metal component effect crack propagation?. A corrosive environment increases the rate of crack propagation. A corrosive environment decreases the rate of crack propagation. A corrosive environment has no affect on the rate of crack propagation.

Which metal is known to suffer stress corrosion at temperatures above 300°C, especially in the presence of salt?. Iron is known to suffer stress corrosion at temperatures above 300°C, especially in the presence of salt. Magnesium is known to suffer stress corrosion at temperatures above 300°C, especially in the presence of salt. Titanium is known to suffer stress corrosion at temperatures above 300°C, especially in the presence of salt.

What can cause filiform corrosion?. Trapped acid in paint coatings can cause filiform corrosion. Incorrect rivet formation can cause filiform corrosion. Incorrect heat treatment can cause filiform corrosion.

What is a common cause of intergranular corrosion in metals?. A common cause of intergranular corrosion in metals is exposure to ultraviolet light. A common cause of intergranular corrosion in metals is incorrect heat treatment. A common cause of intergranular corrosion in metals is mechanical wear and tear.

What is hormoconis resinae?. Hormoconis resinae is a microbial fungal growth in kerosene fuel. Hormoconis resinae is an anti-corrosion surface treatment used in fuel tanks. Hormoconis resinae is a microbial fungal growth in gasoline fuel.

What does a 'NOT-GO' ring screw gauge do when checking external threads?. When checking external threads, a 'NOT-GO' ring screw gauge measures the length of the screw. When checking external threads, a "NOT-GO' ring screw gauge checks that external threads do not exceed the maximum dimensions. When checking external threads, a 'NOT-GO' ring screw gauge ensures that external threads are not below minimum dimensions.

What is the tolerance compatibility of a male threaded part (e.g. a bolt), when used with a female threaded part (e.g. a nut)?. The tolerance class of the male threaded part and female threaded part must be the same. The tolerance class of the male threaded part must be the same or higher than that of the female threaded part. The tolerance class of the female threaded part must be the same or higher than that of the male threaded part.

What is the flank angle of the Whitworth thread form?. The flank angle of the Whitworth thread form is 47.5°. The flank angle of the Whitworth thread form is 55°. The flank angle of the Whitworth thread form is 60°.

What are 'Cap nuts' used for?. 'Cap nuts' are used to prevent over-tightening of the assembly. 'Cap nuts' are used to provide a tighter joint than a normal nut allows. 'Cap nuts' are used when leakage or seepage along the bolt threads is undesirable.

When would you most likely use a stepped stud?. You would most likely use a stepped stud when needing to screw into soft metal for greater holding power. You would most likely use a stepped stud for lightweight assemblies with no specific strength requirements. You would most likely use a stepped stud if alignment control is unnecessary.

What is the most common method of protecting steel and other ferrous alloy fasteners from corrosion?. Anodising is the most common method of protecting steel and other ferrous alloy fasteners from corrosion. Cadmium plating is the most common method of protecting steel and other ferrous alloy fasteners from corrosion. Passivating is the most common method of protecting steel and other ferrous alloy fasteners from corrosion.

Which loads may be taken by bolts with reduced head thickness?. Only shear loads are taken by bolts with reduced head thickness. Only tension loads are taken by bolts with reduced head thickness. Shear loads and tension loads are taken by bolts with reduced head thickness.

How are aluminium alloy bolts usually corrosion protected?. Aluminium alloy bolts are usually passivated. Aluminium alloy bolts are usually coated. Aluminium alloy bolts are usually anodised.

Which of the following types of locking devices primarily uses friction as its method of locking?. Tab washers primarily use friction as their method of locking. Split pinning primarily uses friction as its method of locking. Spring washers and stiff nuts primarily use friction as their method of locking.

What should be done with '2024' rivets, after heat treatment?. '2024' rivets should be left for a minimum of 2 hours before using. '2024' rivets should be refrigerated for a minimum of 2 hours before using. '2024' rivets should be used within 10-20 minutes, or refrigerated until required.

How is a rivet made from '5056' aluminium alloy identified?. A rivet made from '5056' aluminium alloy is identified with a dot on the head. A rivet made from '5056' aluminium alloy is identified with a raised double dash on the head. A rivet made from '5056' aluminium alloy is identified with a cross on the head.

What are hoses for high pressure fuel applications made from?. Hoses for high pressure applications are made from rubber. Hoses for high pressure applications are made from titanium. Hoses for high pressure applications are made from synthetic rubber liner.

What material are springs most commonly made from?. Springs are most commonly mainly made from carbon spring steel, stainless steel or aluminium. Springs are most commonly mainly made from carbon spring steel or copper. Springs are most commonly mainly made from carbon spring steel, Inconel or stainless steel.

Where are needle roller bearings used?. Needle roller bearings are used in high speed operating conditions. Needle roller bearings are used where space saving is an important factor. Needle roller bearings are used where the bearing cannot be greased.

What are needle roller bearings used for?. Needle roller bearings are used when rotational speed is high. Needle roller bearings are used for low speeds or swinging movements. Needle roller bearings are used where loads are both axial and radial.

What loads do aircraft or car wheel bearings take?. An aircraft or car wheel bearing takes radial loads only. An aircraft or car wheel bearing takes axial loads only. An aircraft or car wheel bearing takes radial and axial loads.

When does most metal-to-metal contact between bearing surfaces takes place?. Most metal-to-metal contact between bearing surfaces takes place at start. Most metal-to-metal contact between bearing surfaces takes place at normal running RPM. Most metal-to-metal contact between bearing surfaces takes place at medium to high RPM.

Where are the heel and the toe of a bevel gear located?. The heel is located at the smallest diameter of the bevel gear and the toe is located at the largest diameter of the gear. The heel is located at the largest diameter of the gear and the toe is located at the smallest diameter of the gear. The heel is located at the smallest diameter of the bevel gear and the toe is located at the pitch circle diameter of the gear.

What load carrying capacity an internal spur gear have, compared to an external spur gear of a similar size?. An internal spur gear has a greater load carrying capacity than an external spur gear of similar size. An internal spur gear has less load carrying capacity than an external spur gear of similar size. An internal spur gear has the same load carrying capacity as an external spur gear of similar size.

How can the backlash between two gears be adjusted?. Backlash can be adjusted by increasing the oil pressure in the gearbox. Backlash can be adjusted by changing the distance between their centres. Backlash can be adjusted by adjusting the teeth height within the mesh.

How much carbon does a pig iron contains?. Pig Iron contains about 4% carbon. Pig iron contains no carbon. Pig iron contains about 30% carbon.

The Brinell Hardness tester uses what type of indentor?. The Brinell Hardness tester uses a steel pyramid indentor. The Brinell Hardness tester uses a diamond indentor. The Brinell Hardness tester uses a steel ball indentor.

What are the sound frequencies used in UFD procedures?. The sound frequencies used in UFD procedures 20 Hz - 20 kHz. The sound frequencies used in UFD procedures 500 kHz - 25 MHz. The sound frequencies used in UFD procedures 27.5 Hz - 3.52 kHz.

What does a '7x19' control cable consists of?. A '7x19' control cable has 7 strands having 19 turns per Inch. A '7x19' control cable has 7 strands of 19 wires. A '7x19' control cable has 19 wire cable with a diameter of 7/16 inch.

What is the maximum time between removal from heat treatment furnace and quenching, for aluminium alloy?. The maximum time between removal from heat treatment furnace and quenching, must be not more than 2 seconds. The maximum time between removal from heat treatment furnace and quenching, must be not more than 15 seconds. The maximum time between removal from heat treatment furnace and quenching, must be not more than 7 seconds.

How many times can the heat treatment of clad aluminium alloys be done?. Not more than one (1) time. More than two (2) times. Not more than three (3) times.

How is Aluminium is produced?. Aluminium is produced by converting bauxite to alumina, then to metallic aluminium. Aluminium is produced by converting alumina to bauxite, then to metallic aluminium. Aluminium is produced by converting aluminium oxide to alumina, then to metallic aluminium.

What type of test should be used to do an impact test of a non-ferrous metal at an elevated temperature?. The Charpy test should be used to carry out an Impact test of a non-ferrous metal at an elevated temperature. The Izod test should be used to carry out an impact test of a non-ferrous metal at an elevated temperature. The Brinell test should be used to carry out an impact test of a non-ferrous metal at an elevated temperature.

How can you identify hardening and contamination in a titanium alloy weld?. By a yellowish to bluish colour in the weld area. By a silver to bright appearance in the weld area. By the presence of black slag on the surface of the weld area.

What is the progression of damage repair from least severe to most severe?. Negligible, patch repair, insertion repair, replacement. Negligible, insertion repair, patch repair, replacement. Negligible, replacement, insertion repair, patch repair.

Which fibre type is least resistant to long term exposure to ultraviolet light?. Aramid fibre. Carbon fibre. Glass fibre.

What composite material would most likely be used in areas requiring high temperature resistance?. Aramid/Kevlar fibres would most likely be used in areas requiring high temperature resistance. Ceramic fibres would most likely be used in areas requiring high temperature resistance. Carbon/graphite fibres would most likely be used in areas requiring high temperature resistance.

What kind of finishing paint and/or primer must be used after composite repair?. Must be electrically conductive. It must not be electrically conductive. It must be of any type other than cellulose.

How should removal of paint and other protective coatings from a composite structure be done?. It should be done by the application of paint stripper. It should be done by carefully sanding with sanding block. It should be done by scraping with a sharp metal scraper.

What is a key requirement for successful bonded repairs?. Tapering (scarfing) the repair area. Using mechanical fasteners at equal spacings. Applying a patch with additional thickness.

What materials are used to repair composite material structures?. The original types of fibres, fabrics and matrix resin that were used in the composite construction, are used to repair composite material structures. As repairs are generally small, any similar fibres, fabrics and matrix resin to those that were used in the composite construction, are used to repair composite material structures. Composite structures cannot be repaired, so any damaged composite components must be removed and replaced with a new composite assembly.

How is a wood structure affected by fatigue, compared to metal?. Wood fatigues more rapidly than metal. Wood is more exposed to fatigue than metal. Wood is less exposed to fatigue than metal.

What is aircraft-grade plywood typically made from?. Aircraft-grade plywood is typically made from Hoop Pine wood veneers. Aircraft-grade plywood is typically made from Silver Quandong wood veneers. Aircraft-grade plywood is typically made from Birch wood veneers.

What kind of wood was used for the first wooden aeroplane construction?. Fir was used for the first wooden aeroplane construction. Sitka spruce was used for the first wooden aeroplane construction. Oak was used for the first wooden aeroplane construction.

What is dope primarily used for in the fabric covering of aircraft?. Dope is primarily used to protect the fabric. Dope is primarily used to strengthen the fabric. Dope is primarily used to colour the fabric.

What fabric type(s) are most prone to absorption of moisture and damage due to fungal attack?. Cotton and linen fabrics are most prone to absorption of moisture and damage due to fungal attack. Glass fibre fabrics are most prone to absorption of moisture and damage due to fungal attack. Polyester fabrics are most prone to absorption of moisture and damage due to fungal attack.

How do metals like structural steels and copper alloys tend to corrode in the absence of crevices or galvanic effects?. Structural steels and copper alloys tend to corrode locally at stress points only. Structural steels and copper alloys tend to corrode along edges and corners preferentially. In the absence of crevices or galvanic effects, metals like structural steels and copper alloys tend to corrode generally over the entire surface.

What happens to the cathode during corrosion process?. Material is lost from the cathode, during corrosion. Material is neither gained nor lost by the cathode, during corrosion. Material is gained by the cathode, during corrosion.

How can intergranular corrosion be identified?. Intergranular corrosion can be identified by a grey powder deposit. Intergranular corrosion often cannot be detected and has no visual surface indication. Intergranular corrosion can be identified by its flaking and lifting of the material layers.

Which type of agent is used as an anti-fretting agent in mechanisms when approved?. Lithium grease is used as an anti-fretting agent in mechanisms when approved. Petroleum jelly is used as an anti-fretting agent in mechanisms when approved. Molybdenum disulphide grease is used as an anti-fretting agent in mechanisms when approved.

What type of corrosion can be prevented by using Molybdenum disulphide grease?. Fretting corrosion is prevented by the use of molybdenum disulphide grease. Crevice corrosion is prevented by the use of molybdenum disulphide grease. Intergranular corrosion is prevented by the use of molybdenum disulphide grease.

When measuring a thread using a 'go/not-go' plug screw gauge, the 'go' side should fit/not-fit where on the thread?. The 'go' side should not fit inside the internal thread. The 'go' side should fit inside the internal thread. The 'go' side should fit outside the external thread.

Which of the following thread forms have become the international industry standard for fasteners on modern commercial aircraft?. British Standard Whitworth (BSW) has become the international industry standard for fasteners on modern commercial aircraft. Unified Fine (UNF) and Unified Coarse (UNC) has become the international industry standard for fasteners on modern commercial aircraft. British Association (BA) has become the international industry standard for fasteners on modern commercial aircraft.

Which of the following screw types are all cruciform head type?. Philips, Reed, and Prince, Posidrive are all cruciform head type. Tri-wing, Philips, and Posidrive are all cruciform head type. Posidrive, Torx, and Philips are all cruciform head type.

Which studs have one threaded end of a larger diameter than other?. Stepped studs have one threaded end of a larger diameter than other. Shoulder studs have one threaded end of a larger diameter than other. Waisted studs have one threaded end of a larger diameter than other.

How many times can a locking plate be used?. A locking plate is used until all the tabs have been broken off. A locking plate is used for as long as it remains serviceable. A locking plate is used once only then must be replaced.

What do the head markings on an American aluminium rivet indicate?. The head markings on an American aluminium rivet indicate the size of the rivet. The head markings on an American aluminium rivet indicate the manufacturer of the rivet. The head markings on an American aluminium rivet indicate the material and strength of the rivet.

What are the main components used in the installation of a pin rivet?. The main components used in the installation of a pin rivet are a pin with a head and a mating collar. The main components used in the installation of a pin rivet are a bucking bar and a rivet gun. The main components used in the installation of a pin rivet are a threaded bolt and nut.

How is the valve of a quick-release coupling held in the closed position when disconnected?. By a thread. By a pin. By a spring.

What is the part of the teeth on the smaller diameter of a bevel gear called?. The 'heel' is the part of the teeth on the smaller diameter of a bevel gear. The 'toe' is the part of the teeth on the smaller diameter of a bevel gear. The 'foot' is the part of the teeth on the smaller diameter of a bevel gear.

How is the dimension of a baseline circle of a gear defined?. The baseline circle is the diameter of the gear without the teeth. The baseline circle is the outside diameter of the gear. The baseline circle is the diameter of the pitch circle of the gear.

What is a Hardy Spicer coupling?. A Hardy Spicer coupling is a control system lever. A Hardy Spicer coupling is a chain attachment. A Hardy Spicer coupling is a universal joint.

What type of carbon steel is a steel with 1.3% carbon content?. A steel with 1.3% carbon content is high carbon steel. A steel with 1.3% carbon content is medium carbon steel. A steel with 1.3% carbon content is low carbon steel.

Which of the following tests are all the tests commonly used for hardness testing of a ferrous metal?. Brinell, Vickers and Rockwell tests are commonly used for hardness testing of a ferrous metal. Rockwell, Brinell and Charpy tests are commonly used for hardness testing of a ferrous metal. Rockwell, Vickers and Izod tests are commonly used for hardness testing of a ferrous metal.

Where are control cable quadrants and drums used?. Control cable quadrants and drums are used when cable tension needs to be regulated. Control cable quadrants and drums are used when an input or an output from the cable system is made. Control cable quadrants and drums are used when changes in direction of control cable is needed.

How are control cables classified?. Control cables are classified by their minimum breaking load and nominal diameter. Control cables are classified by their circumference and length. Control cables are classified by their number of wires in a strand.

When does a cable tension regulator automatically adjust a cable tension?. A cable tension regulator automatically adjusts the cable tension when the temperature changes, and when there is no pilot input to the control system. A cable tension regulator automatically adjusts the cable tension when the temperature changes, and there is a pilot input to the control system. A cable tension regulator automatically adjusts the cable tension at any time that the temperature changes, regardless of pilot input to the control system.

Where would you most likely find broken strands or wires when inspecting a control cable run?. Broken strands or wires are most likely found at the end attachments. Broken strands or wires are most likely found on a straight part of the control run. Broken strands or wires are most likely found where the cable runs around a pulley.

An electrical cable is marked 3135-27 B 20 N. What does the '27' represent?. The '27' represents the wire number. The '27' represents the current rating. The '27' represents the wire gauge.

How does the design of electrical connectors reduce the risk of short circuits during their connecting and disconnecting?. The connector engaging spigots are pre-aligned to both of the mating shells, reduces the risk of short circuits during their connecting and disconnecting. The return side (cold) of a circuit uses socket type contacts, reduces the risk of short circuits during their connecting and disconnecting. The live side (hot) of a circuit uses socket type contacts, reduces the risk of short circuits during their connecting and disconnecting.

What effect does adding other elements to aluminium alloys, such as copper, manganese or magnesium has on its corrosion resistance?. Increases corrosion resistance of aluminium alloys. Decreases corrosion resistance of aluminium alloys. Has no affect on the corrosion resistance of aluminium alloys.

When replacing aircraft fabric, when is a Supplemental Type Certificate (STC) applied for?. When the fabric is provided by a different supplier, even if the fabric is the same type, an STC should be applied for. Anytime that the fabric is entirely replaced, even if the fabric is the same type, an STC should be applied for. When the fabric is replaced with a fabric different from the original fabric, an STC should be applied for.

How should aluminium alloy structure that is difficult to assess as either primary or secondary structure be classified?. As primary structure. As a secondary structure. As either a primary or secondary structure, it should not be repaired.

What benefit do kevlar threads in carbon fibre cloth (approximately every 2 inches / 50 mm on the weft) have?. Kevlar threads provide additional strength to the carbon fibre cloth. Kevlar threads provide easier workability to the carbon fibre cloth. Kevlar threads provide electrical conductivity to the carbon fibre cloth.

What is the quickest method to examine the extent of any delamination?. A tap test is the quickest method to examine the extent of any delamination in a composite structure. Ultrasonic test is the quickest method to examine the extent of any delamination in a composite structure. X-ray inspection is the quickest method to examine the extent of any delamination in a composite structure.

What kind of process is corrosion?. Corrosion is hydroelectric process only. Corrosion is chemical and electrochemical process. Corrosion is electromechanical process only.

What is the rate of corrosion of nickel in industrial and marine atmospheres?. Nickel corrodes very fast. Nickel is highly resistant to corrosion. Nickel corrodes slowly.

What usually causes intergranular corrosion?. Incompatible metals usually cause intergranular corrosion. Incorrect heat treatment usually causes intergranular corrosion. Contact with acid usually causes intergranular corrosion.

What type of nut is a 'Kayloc' nut?. A 'Kayloc' nut is a castellated nut. A 'Kayloc' nut is a stiffnut. A 'Kayloc' nut is a locknut.

Which thread form(s) has the same angle as a UNF and UNC thread forms?. The BA thread form has the same angle as the UNF and UNC thread form. The Metric thread form has the same angle as the UNF and UNC thread form. The BSW and BSF thread forms have the same angle as the UNF and UNC thread form.

Which of the following thread forms is fatigue resistant?. UNF is a fatigue resistant thread form. UNJF is a fatigue resistant thread form. UNS is a fatigue resistant thread form.

What feature does a 'Type A' self-tapping screws have?. Type A' self-tapping screws have a blunt point. Type A' self-tapping screws have a sharp point. 'Type A' self-tapping screws have an unthreaded point.

What is the angle of airforce and Navy (AN) pipe unions?. Airforce and Navy (AN) pipe unions have a flare angle of 48°. Airforce and Navy (AN) pipe unions have a flare angle of 74°. Airforce and Navy (AN) pipe unions have a flare angle of 32°.

Which standard has replaced the AN system?. Aircraft General Standards (AGS) has replaced the AN system. Military Standard (MS) has replaced the AN system. National Aerospace Standards (NAS) has replaced the AN system.

What type of spring does a spring rod contains?. A spring rod, used as a steering bungee, contains a compression spring. A spring rod, used as a steering bungee, contains a tension spring. A spring rod, used as a steering bungee, contains a torsion spring.

Where is an air bearing typically used?. An air bearing is typically used on very fast running light machines such as turbochargers. An air bearing is typically used on very heavy machinery such as the front bearing of a turbofan engine. An air bearing is typically used for automatic flight control systems on an aeroplane or helicopter.

What is the 'line of action' of meshing gears?. The 'line of action' of meshing gears is a tangent between the baseline circles of the meshing gears. The 'line of action' of meshing gears is a straight line from the centre of one gear to its meshing gear. The 'line of action' of meshing gears is the pitch circle of the gears in mesh with each other.