Metal Cutting, Grinding & Hammering Quiz

When the original panel is missing or badly damaged, you make a template out of plastic. This is because the template will serve as a guide to recreate the shape and dimensions of the original panel, allowing for accurate trimming and replacement.

Premixed frozen sealant can be used by simply thawing it and using it. There is no need to use a heat gun, heat lamp, or wait overnight for it to thaw. Thawing the sealant will make it easier to work with and ensure proper application.

Exfoliation corrosion is an advanced form of intergranular corrosion. It occurs when corrosion penetrates along the grain boundaries of a metal, causing the grains to separate and peel away from the surface. This type of corrosion is commonly observed in aluminum alloys, where it can lead to severe structural damage. Unlike other forms of intergranular corrosion, exfoliation corrosion typically occurs in materials with a high degree of anisotropy, such as rolled or extruded metals. It is characterized by the formation of layers or sheets that peel away from the metal surface, resembling the peeling of an onion.

A straight edge can be used to detect skin bulge in the early stages of corrosion when inspecting spot welds. By placing the straight edge on the surface of the weld, any irregularities or bulges can be easily identified. This tool allows for a quick and simple visual inspection to determine if there is any corrosion present.

When using parallel strokes with a spray gun, it is recommended to overlap 50 percent of the previous stroke. This allows for an even and consistent coverage of the surface being sprayed. Overlapping too much may result in excessive build-up of paint, while overlapping too little may leave gaps and unevenness in the finish. Therefore, overlapping 50 percent strikes a balance between these two extremes, ensuring a smooth and uniform spray pattern.

When the coating material is too cold, it can cause orange peel when spray painting. This occurs because the cold coating material does not flow smoothly and evenly onto the surface, resulting in a textured appearance similar to the skin of an orange. To prevent this, it is important to ensure that the coating material is at the proper temperature before spraying.

Prior to shaving millable head Jo-Bolts, it is important to check the fastener for looseness. This step ensures that the Jo-Bolts are securely fastened before proceeding with the shaving process. It helps to prevent any potential damage or accidents that may occur if the fastener is loose during the shaving operation.

To maintain proper hole alignment when drilling holes for fasteners, clamping all repair members in place is the correct answer. By securely clamping the repair members, they are held in position and prevent any movement or misalignment during the drilling process. This ensures that the holes are drilled accurately and in the desired location, allowing for proper alignment and a secure fastening of the components. Using a reamer to upsize the hole, holding the drill at a right angle to the surface, or pilot drilling holes through all mating surfaces may not necessarily guarantee proper hole alignment.

If the nut plate is misaligned after installing it using pull-through blind rivets, the probable cause is that the nut plate was clamped too loosely during installation. When the nut plate is not securely clamped, it can easily shift or move, resulting in misalignment.

The correct answer is Fuselage. The fuselage is the main aircraft structural assembly to which other assemblies, such as the wings, nacelles, and empennage, are directly or indirectly attached. The fuselage is the central body of the aircraft that houses the crew, passengers, and cargo, and provides the main structural support for the aircraft.

An angle drill is used to remove damage when the damage is in a limited space. This is because an angle drill is designed to access tight or confined areas where a regular drill may not fit. Therefore, when the damage is in a limited space, an angle drill is the appropriate tool to use for the removal process.

The correct answer is that blueprints are another name for mechanical drawings. This means that the terms "blueprints" and "mechanical drawings" can be used interchangeably to refer to the same thing.

Vacuum pressure is used to apply uniform pressure to laminated fiberglass repairs. This method involves placing the repair area in a vacuum bag and removing the air from the bag, creating a vacuum. The vacuum then applies even pressure to the repair, ensuring proper adhesion and minimizing air bubbles. This technique is commonly used in fiberglass repairs to achieve a strong and uniform bond.

On a blueprint, zone numbers are used to locate a specific point. These numbers divide the blueprint into different zones or sections, making it easier to pinpoint the desired location. By referring to the zone number, one can quickly identify the area of the blueprint where the specific point is located, facilitating efficient navigation and communication in architectural or engineering projects.

The correct answer is "bend allowance". The bend allowance refers to the amount of metal that is required to form a bend in a material. It takes into account factors such as the material's thickness, bend angle, and the radius of the bend. By calculating the bend allowance, manufacturers can determine the length of material needed for bending processes, ensuring accurate and precise fabrication.

Air Force publications are divided into two categories: directive and non-directive. Directive publications provide specific guidance and instructions on procedures, policies, and regulations that must be followed. These publications are mandatory and enforceable. Non-directive publications, on the other hand, provide informative and educational material that is not mandatory but is still valuable for reference and guidance. By categorizing publications into directive and non-directive, the Air Force ensures clear communication and compliance with important policies and procedures while also providing additional resources for information and education.

An atom that has gained or lost electrons and has acquired an electrical charge is called an ion. This is because ions are formed when atoms either gain or lose electrons, resulting in an unequal number of protons and electrons. The imbalance in charges gives the atom a net positive or negative charge, making it an ion. Protons and neutrons are subatomic particles found within the nucleus of an atom, while electrons are negatively charged particles that orbit around the nucleus. However, only ions have a net electrical charge due to the gain or loss of electrons.

The first step of a general corrosion inspection is to ensure that the area has been thoroughly cleaned. This is important because any dirt, debris, or contaminants on the surface can interfere with the inspection and make it difficult to accurately assess the extent of corrosion. By cleaning the area beforehand, the inspector can get a clear view of the surface and properly evaluate the corrosion damage. Once the area is clean, further steps can be taken to dislodge paint irregularities, determine the extent of corrosion, and examine the area with a magnifying glass.

Corrosion that appears as blistering, exfoliation, and scaling or flaking is classified as severe. This classification is based on the extent and severity of the corrosion damage. When corrosion reaches a point where it causes visible blistering, exfoliation, and scaling or flaking, it indicates a significant level of damage and deterioration. This type of corrosion can lead to structural weakness and compromise the integrity of the material or surface affected. Therefore, severe is the appropriate classification for this type of corrosion.

Chemical paint remover is typically mixed immediately before use to ensure its effectiveness. This is because the active ingredients in the remover can degrade or evaporate over time, reducing its ability to remove paint effectively. By mixing it right before use, the remover remains potent and ready to break down the paint effectively. Mixing it too early, such as 1 or 2 hours before use, may result in a less effective product. Mixing it 30 minutes before use may still be acceptable, but immediate mixing is generally recommended for optimal results.

To drill an interference fit hole for a fastener, it is necessary to pilot drill the hole first. This means using a smaller drill bit to create a guide hole. Once the pilot hole is created, a reamer is then used to finish the hole to the desired size. This process ensures that the final hole is precise and accurately sized for the fastener, allowing for a tight and secure fit. Using only a reamer or only a drill bit would not achieve the same level of accuracy and precision required for an interference fit hole.

A wing nut is a type of nut that can be tightened by hand. It has two large wings on opposite sides, which allow for easy gripping and turning without the need for tools. This makes it convenient for quick adjustments or temporary fastenings that do not require a lot of torque.

When a tube bender is not available, sand can be used as a method to bend a piece of tubing. This technique involves filling the tubing with sand and then heating it. The heated tubing can then be bent into the desired shape using a bending tool or by applying pressure. The sand prevents the tubing from collapsing or deforming during the bending process, ensuring a smooth and accurate bend.

To use the job selector dial on a contour metal cutting saw, you need to know the material composition and thickness. This is because different materials and thicknesses require different cutting speeds and feed rates. The job selector dial allows you to set the appropriate cutting parameters based on the specific material and thickness you are working with, ensuring optimal cutting performance and accuracy. Knowing the type of blade already installed, the pitch of the material being cut, and the degree the material is placed in relation to the blade are not relevant factors for using the job selector dial.

Silicon carbide is the correct answer for grinding aluminum using a bench grinder. Silicon carbide is a hard and sharp abrasive material that is specifically designed for grinding non-ferrous metals like aluminum. It is capable of removing material quickly and efficiently without clogging or overheating the grinding wheel. Using aluminum oxide or other abrasive materials can cause the wheel to clog and overheat, leading to poor grinding performance and potential damage to the workpiece. Diamond and garnet are not commonly used for grinding aluminum and are more suitable for other applications.

When a new Air Force Technical Order (AFTO) Form 781A is initiated, discrepancies with a Red X must not be transferred to the AFTO Form 781K. The Red X symbol indicates a condition that may endanger the safety of personnel or equipment, so it is important to address and resolve these discrepancies immediately rather than transferring them to another form. The other options, Red Dash and Red Diagonal, are used to indicate less critical discrepancies that can be transferred to the AFTO Form 781K for further action. Discrepancies with a supply document number can also be transferred to the AFTO Form 781K for supply-related actions.

The distance from the under-head bearing surface to the start of the thread is called the grip length. This measurement is important as it determines how securely the bolt can be fastened. The grip length needs to be appropriate for the specific application to ensure proper engagement of the threads and optimal performance of the bolt.

When removing damage from a composite structure, it is important to remove as little sound material as possible. This ensures that the structural integrity of the composite is not compromised and that the repaired area remains strong. By removing only the damaged material and leaving the sound material intact, the overall strength and performance of the composite structure can be maintained.

Corrosion preventive compounds (CPC) are separated into two categories: water displacing and non-water displacing. Water displacing CPCs are designed to displace moisture and create a protective barrier on the surface, preventing corrosion. Non-water displacing CPCs, on the other hand, do not displace moisture but rather form a protective film on the surface to prevent corrosion. These two categories offer different approaches to corrosion prevention depending on the specific needs and conditions.

The wing nut is used in assemblies where frequent removal is required and the desired tightness can be achieved by using fingers. Wing nuts have two large metal "wings" on opposite sides, which provide an easy grip and allow for quick hand tightening and loosening without the need for tools. This makes them convenient for applications where frequent adjustments or disassembly are necessary.

A drift punch is used to align fastener holes in two pieces of metal. It is a long, tapered tool with a pointed end that is used to accurately position the holes by gently tapping it into the misaligned holes. The taper allows the punch to gradually widen the holes and bring them into alignment without causing any damage to the metal surfaces. This ensures that the fasteners can be inserted easily and securely into the aligned holes, resulting in a strong and stable connection between the two pieces of metal.

Magnesium is the world's lightest structural metal. It has a low density and is known for its lightness and strength. It is commonly used in industries such as aerospace and automotive due to its excellent weight-to-strength ratio. Magnesium alloys are also used in various applications where weight reduction is important, such as in the manufacturing of electronic devices and sporting equipment.

The transition area of a metal-bonded honeycomb panel refers to the area between the flat section of the panel and the panel attachment area. This is the region where the panel transitions from the flat portion to the area where it is attached to another component or structure.

Advanced composite materials are sensitive to temperature changes, and storing them in cold storage helps to maintain their integrity. The maximum temperature permitted for storing these materials is 0ºF. This extremely low temperature ensures that the composite materials remain stable and do not undergo any undesirable chemical or physical changes. Storing them at higher temperatures could potentially compromise their structural properties and lead to degradation or damage. Therefore, maintaining a maximum temperature of 0ºF is crucial for the safe storage of advanced composite materials.

A thin line with alternating and evenly spaced long and short dashes is known as a center line. This type of line is commonly used in technical drawings and blueprints to indicate the center of an object or feature. It helps to provide a visual reference point for measurements and alignments.

Single view drawings are used to manufacture objects using very thin, flat metal. This type of drawing provides a comprehensive representation of the object, showing all necessary dimensions, angles, and details in a single view. It allows manufacturers to accurately understand and produce the object without the need for multiple views or additional drawings.

The job guide contains operational checkout procedures. It provides step-by-step instructions for performing tasks and checks during the operation of a system or equipment. It helps technicians ensure that all necessary procedures are followed correctly and that the equipment is functioning as intended. The job guide is a valuable resource for troubleshooting and maintenance activities.

The pH scale is used to measure the strength of an electrolyte. The pH scale measures the concentration of hydrogen ions in a solution. A lower pH value indicates a higher concentration of hydrogen ions and a stronger electrolyte, while a higher pH value indicates a lower concentration of hydrogen ions and a weaker electrolyte. Therefore, the potential of hydrogen (pH) is the correct scale to measure the strength of an electrolyte.

The touch-up pen paint applicator should be mixed for 60 seconds prior to use. This ensures that the paint is well-mixed and ready to be applied evenly. Mixing the paint for too short a time may result in uneven application, while mixing for too long may cause the paint to dry out or become clumpy. Therefore, 60 seconds is the optimal amount of time to mix the paint before using the touch-up pen paint applicator.

The correct answer is Cross-pin. A cross-pin is a type of fastener used in an airlock assembly that is designed to be used only once and not reused. It is typically used to secure and connect different components of the airlock assembly. Unlike other parts such as grommets, rigid receptacles, and floating receptacles, the cross-pin is not meant to be taken apart or reassembled, making it a non-reusable component.

A gang channel is a type of nut that comes in long strips. It is commonly used in construction and assembly work where multiple nuts need to be installed quickly and efficiently. The long strip design allows for easy handling and installation, saving time and effort.

A single-cut file is used to sharpen the blades of cutting tools. This type of file has rows of parallel teeth that are cut at an angle to the centerline of the file. When used, the file only cuts in one direction, making it ideal for sharpening blades. The single-cut file allows for precise and controlled sharpening, ensuring that the cutting tool's blades are sharpened evenly and effectively.

Flaps are auxiliary flight controls that are located on the trailing edge of the wings. They can be extended or retracted to increase or decrease lift and drag during different phases of flight. By extending the flaps, the wing area and camber are increased, allowing the aircraft to generate more lift at lower speeds, such as during takeoff and landing. Therefore, flaps are considered an auxiliary flight control because they assist in controlling the aircraft's lift and drag characteristics.

A grid made up of horizontal and vertical lines is used when inspecting for distortions. This grid helps to identify any irregularities or deformities in the panel or object being inspected. By placing the grid over the panel and observing the lines, any distortions or deviations from straight lines can be easily detected. This method is effective in identifying and assessing distortions in a clear and systematic manner.

When making a repair, the main concern is to restore the original strength of the object or structure. This means ensuring that the repaired area is able to withstand the same amount of force or stress as it did before it was damaged. The repair should be done in such a way that it does not compromise the overall strength and integrity of the object. Therefore, strength is the most important consideration when making a repair.

Cast iron is a ferrous metal because it contains a high percentage of iron. Ferrous metals are those that contain iron as the main component, and cast iron is made by melting iron and adding small amounts of carbon and other elements. It is known for its strength and durability, making it suitable for applications such as construction, pipes, and automotive parts. Zinc, gold, and silver are non-ferrous metals as they do not contain iron as the main component.

Chromium is the preferred steel alloy for corrosion resistance and hardness. Chromium forms a protective oxide layer on the surface of the steel, which helps prevent corrosion. Additionally, chromium increases the hardness of the steel, making it more resistant to wear and abrasion. This makes chromium an ideal choice for applications where both corrosion resistance and hardness are important, such as in stainless steel.

A metal-bonded honeycomb panel is constructed by bonding a core between two metal facings. This construction provides strength and rigidity to the panel while also keeping it lightweight. The core, typically made of aluminum or other materials, is structured in a honeycomb pattern, which further enhances the panel's strength-to-weight ratio. The metal facings on either side of the core provide protection and durability to the panel, making it suitable for various applications in industries such as aerospace and construction.

When multiplying fractions, we multiply the numerators together and the denominators together. In this case, multiplying 5/6 by 3/5 gives us (5*3)/(6*5) = 15/30. However, we can simplify this fraction by dividing both the numerator and denominator by their greatest common divisor, which is 15. So, 15/30 simplifies to 1/2.

Two thermocouples are used and they are positioned 2" from the edge of the heat blanket.

Before using abrasive blasting to remove corrosion, it is important to clean any oil, grease, or other soils from the surfaces. This step ensures that the abrasive blasting process is effective and that the corrosion is properly removed. Cleaning the surfaces helps to remove any contaminants that could interfere with the blasting process and ensures that the abrasive media can work efficiently on the corroded areas. By starting with clean surfaces, the abrasive blasting process can be more successful in removing corrosion and restoring the affected surfaces.

The correct answer is "Forward fuselage, upper wings, lower wings, aft fuselage and tail section." This sequence is the general top coating sequence for small aircraft-tail toward hanger exhaust. It starts with the forward fuselage, then moves to the upper wings, lower wings, aft fuselage, and finally the tail section. This sequence ensures that the top coating is applied in a logical and efficient manner, covering all necessary areas of the aircraft.

To avoid stripping threads when installing a nut and bolt, it is important to torque the nut to proper specifications. Torque refers to the amount of force applied to tighten the nut and bolt. If the nut is not torqued properly, it can cause excessive stress on the threads, leading to stripping. By following the recommended torque specifications, the nut can be tightened to the appropriate level without damaging the threads, ensuring a secure and reliable connection.

When riveting parts together, the first step is to secure the parts to prevent slippage. This is important because if the parts are not properly secured, they may move or shift during the riveting process, resulting in misalignment or improper joining of the parts. By securing the parts, it ensures that they are held firmly in place, allowing for accurate and successful riveting.

A drill bushing fixture is not required to remove a tight Jo-bolt fastener. A punch is used to create a starting point for drilling, a hammer is used to strike the punch, and a pilot drill is used to create a hole for the fastener. However, a drill bushing fixture is not necessary for the removal process.

Using a drill-bushing is not a procedure for drilling a mechanical-lock blind rivet hole. A drill-bushing is typically used for precision drilling to ensure accurate hole placement and to prevent the drill bit from wandering. However, when drilling a blind rivet hole, a drill-bushing is not necessary as the blind rivet is designed to be installed without access to the backside of the workpiece. Therefore, the use of a drill-bushing is not required in this procedure.

To properly pull-test a cable, it is necessary to keep the cable under tension for a sufficient amount of time. This allows for any potential weaknesses or faults in the cable to be identified. Three minutes is likely the appropriate duration for the pull-test as it provides enough time to observe any potential issues that may arise under tension.

When stretching or shrinking, repeating the strokes too long in one spot can cause the edge of flanges to crack and split. This is because excessive pressure and heat are concentrated in one area for an extended period of time, leading to the weakening and eventual failure of the flange edge. It is important to evenly distribute the stretching or shrinking process to avoid putting excessive stress on a single spot.

A lower grit number indicates a coarser abrasive sheet or emery paper. Therefore, 120 grit is the coarsest option among the given choices. It would be suitable for blending out long, deep scratches on titanium as it will remove more material and provide a rougher surface finish compared to higher grit numbers.

The correct answer is "There use is never authorized." This means that an impact driver such as a rivet gun should never be used to loosen stuck fasteners.

A film adhesive is used to provide a more uniform bondline thickness when making a metal-bonded honeycomb repair. Film adhesives are thin, flexible sheets that can be easily applied to surfaces. They are designed to distribute the adhesive evenly across the bondline, ensuring a consistent thickness. This helps to achieve a strong and reliable bond between the metal and the honeycomb structure. Foam adhesives, paste adhesives, and liquid adhesives may not provide the same level of uniformity and control over the bondline thickness, making them less suitable for this specific repair application.

The term "length" represents the longest horizontal dimension of a plane figure. It refers to the measurement from one end of the figure to the other in a horizontal direction.

The temperature should be at room temperature when mixing a touch-up pen paint applicator pen. This is because room temperature allows the paint to flow smoothly and evenly, ensuring a better application. Extreme temperatures, such as 60 or 90 degrees, can affect the consistency and quality of the paint, leading to potential issues with the touch-up job. Similarly, the outside temperature may vary greatly and can also impact the paint's performance, so it is best to mix the paint at room temperature.

Jelled or lumpy coating materials are not suitable for use as they can affect the quality of the coating. They may cause uneven application or result in a rough finish. Therefore, it is best to discard them immediately to ensure a smooth and satisfactory coating application.

Edge sealing compound is used to protect decals against abrasion after they are applied to an aircraft. This compound creates a protective barrier around the edges of the decal, preventing it from being damaged or worn down by friction or contact with external elements. The compound helps to extend the lifespan of the decal and maintain its appearance over time.

The grip length of the High Lok HL610V5-11 is 11.

By setting the back roller at an angle, it allows the metal to be fed into the slip roll former in a way that creates a conical shape. The angle of the back roller determines the angle at which the metal is bent, resulting in the desired conical shape. The grooved portion of the rolls and feeding the metal at an angle may also be used in the process, but they alone cannot form a conical shape. Reversing the metal after each pass through the rollers is not necessary for forming a conical shape.

Bulkheads provide shape, strength, and rigidity to the aircraft fuselage. They are structural partitions that divide the fuselage into compartments and provide support to the overall structure. Bulkheads are usually made of strong materials such as aluminum or composite materials and are designed to withstand the various forces and stresses experienced during flight. By distributing these forces and providing structural integrity, bulkheads play a crucial role in maintaining the shape and strength of the aircraft fuselage.

When fabricating a doubler for a flush skin repair in an open area, it is important to select material that is one-gage thicker than the skin. This is because the doubler needs to provide additional strength and support to the damaged area. By selecting material that is slightly thicker than the skin, it ensures that the doubler will be able to effectively reinforce the repair and prevent further damage.

A nibbler is the correct answer because it is a tool specifically designed for cutting sheet metal. It has a small cutting head that can easily maneuver through the metal, creating clean and precise cuts. On the other hand, using a router, hacksaw, or circular saw for cutting magnesium alloy sheet metal can be dangerous and ineffective. These tools are not designed for sheet metal cutting and may cause damage to the material or result in uneven and jagged cuts.

Inadequate surface preparation is the most common cause of coating failure. When the surface is not properly prepared before applying the coating, it can lead to poor adhesion and lack of bond between the coating and the surface. This can result in the coating peeling, flaking, or blistering over time. Proper surface preparation involves cleaning, removing contaminants, and ensuring a smooth and properly primed surface for the coating to adhere to.

The given question asks for an authorized substitute for a taper lok fastener. The options provided suggest reaming the taper lok hole to accommodate a larger sized hi-lok fastener, a high shear pin rivet, or a high shear stump bolt. However, the correct answer is that no substitute exists. This means that there is no authorized alternative to a taper lok fastener.

The correct answer is "Indented slots stamped on the head of the fastener." This indicates that the taper-lok pin is an injection type. The indented slots on the head of the fastener serve as a visual marker to distinguish it from other types of taper-lok pins.

Tinner's snips are a type of metal cutting snips that have straight blades. They are commonly used by tinners or sheet metal workers for cutting straight lines in thin metal sheets. The straight blades allow for precise and clean cuts, making them ideal for tasks that require accuracy and straight edges.

The most likely cause of having more inside chamfer on one side of the tubing and more outside chamfer on the opposite side is misalignment between the spindle and vise jaw. If the spindle and vise jaw are not properly aligned, it can result in uneven cutting and chamfering of the tubing. This misalignment can cause the cutting head to be positioned at an angle, resulting in different chamfer sizes on each side of the tubing. Adjusting the alignment between the spindle and vise jaw should solve this issue.

When using a powered disc sander, the maximum allowable bed gap is 1/8". This means that the distance between the sanding disc and the bed of the sander should not exceed 1/8". This is important because a larger gap can lead to instability and improper sanding results. It is crucial to maintain a proper bed gap to ensure safe and effective use of the powered disc sander.

The correct answer is "front of each die holder." This means that the machine capacity of a rotary punch can be found on the front of each die holder. This suggests that the information regarding the machine's capacity is displayed or indicated on the die holder itself, making it easily accessible for the user.

The end marking template for a Permalite (Deutschlite) fitting is based on the tubing's outside diameter. This means that the marking template will be designed to fit the specific outside diameter of the tubing, ensuring a proper and secure fit between the fitting and the tubing. The outside diameter is an important factor in determining the compatibility and suitability of the fitting for the tubing.

In rivet and bolt applications, the type of stress that needs to be considered is shear stress. Shear stress occurs when two forces are applied parallel to each other but in opposite directions, causing the material to slide or deform. In rivet and bolt applications, shear stress is important because it determines the strength and stability of the joint, ensuring that the fastener can withstand the forces acting upon it without failing.

When holes are drilled oversize, it means that the diameter of the hole is larger than intended. This can cause the reamer to scrape and swedge the material instead of cutting it because there is not enough material for the reamer to engage with and remove. As a result, the reamer ends up pushing and deforming the material rather than cleanly cutting through it.

When using an original door as a template, it is important to ensure that the original door has the proper fit. This means that the dimensions and shape of the original door should match the desired door that is being created. If the original door does not have the proper fit, then the new door made using it as a template will also not fit correctly. Therefore, it is crucial to check and confirm that the original door has the proper fit before using it as a template.

Corrosion preventive compounds (CPC) are used to prevent corrosive materials from contacting and corroding bare metal surfaces. This means that CPC creates a protective barrier between the metal surface and corrosive materials, preventing them from coming into direct contact and causing corrosion. By using CPC, the metal surfaces are effectively shielded and preserved from the damaging effects of corrosion.

Before wearing a respirator with a tight-fitting face-piece, it is necessary to be fit tested with the same make, model, and style of respirator that will be used in the workplace. This ensures that the respirator properly fits the individual's face and provides an effective seal. Fit testing is important to ensure that the respirator will provide the intended protection against hazardous substances in the workplace. Thoroughly cleaning and disinfecting the respirator, inspecting for damaged parts, and ensuring no facial hair comes between the sealing surface are also important steps, but they are not specifically required before wearing the respirator.

To avoid building up excessive internal stresses, the maximum interference fit of a B fit hi-lok or hi-tigue should not exceed .002". This means that the difference in size between the fastener and the hole it is being inserted into should not be greater than .002 inches. This ensures that the fit is tight enough to hold the components together securely, but not so tight that it causes excessive stress or deformation.

Stenciling is a rapid way of preparing a sign because it involves using a pre-cut template to create a design or text. By placing the stencil on the surface and applying paint or ink over it, the desired image or message can be easily transferred onto the sign. This method is efficient and time-saving compared to drawing or transferring the design by hand, making stenciling a quick and effective option for sign preparation.

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Using a torch to cut cables is not recommended because it can cause the cables to overheat, melt, or catch fire. Torches generate high temperatures that can damage the insulation and conductors of the cables, leading to potential safety hazards or electrical failures. It is safer and more effective to use tools specifically designed for cutting cables, such as a cable swager or cutting machine, which can provide clean and precise cuts without causing damage to the cables.

A cape chisel is best suited for cutting slots and keyways. Cape chisels have a narrow, rectangular blade that tapers to a point, allowing for precise cutting in tight spaces. The flat chisel would not be as effective for cutting slots and keyways as it has a wider blade. The diamond point chisel is more suitable for carving or shaping materials, rather than cutting slots. The half roundnose chisel is primarily used for creating concave shapes, making it less suitable for cutting slots and keyways.

The largest twist drill that the chuck on a hand drill can normally accommodate is 1/4". This means that the chuck on a hand drill is designed to hold drill bits with a maximum diameter of 1/4".

Bumping is the forming process that involves using a smooth-face dolly. In this process, a smooth-faced dolly is used to shape and contour a metal sheet or panel by striking it with a hammer. The smooth-face dolly helps to distribute the force evenly and prevent any damage to the surface of the metal. This technique is commonly used in automotive and aircraft industries to create curved or contoured panels.

During the bumping process, a sandbag is typically used as a support. This is because a sandbag provides a flexible and malleable surface that can be easily shaped and adjusted to support the object being bumped. The sandbag absorbs the impact and helps distribute the force evenly, preventing any damage or deformation to the object. Additionally, the weight and stability of the sandbag ensure that it stays in place and provides a steady support throughout the bumping process.

When making a step-joint repair to an aramid honeycomb composite panel, the replacement plies should be made to match each ply in the original panel. This means that the orientation and alignment of the replacement plies should be the same as the plies in the original panel. By matching each ply, the repair will be able to maintain the structural integrity and strength of the original panel, ensuring a successful repair.

To accurately represent three dimensions on a drawing, it is typically necessary to show at least two views. By providing two different perspectives of an object or structure, it becomes easier to understand its shape, size, and spatial relationships. This allows the viewer to visualize the object in three dimensions, even though it is represented on a two-dimensional surface. Showing only one view may not provide enough information, while showing more than two views may be excessive and unnecessary for most purposes.

The correct answer is when there is no discoloration on a clean drying cloth. This indicates that the surface is clean and free from any residue or contaminants that could affect the application of the sealant. If there is no discoloration on the cloth, it means that the cleaning process has effectively removed any dirt or stains from the surface, ensuring a proper and smooth application of the sealant.

The included angle of a center punch should be 90 degrees. This angle allows the punch to create a precise and deep indentation on the material being punched. A 90-degree angle ensures that the force is evenly distributed and prevents the punch from slipping or damaging the workpiece.

6061-T is the correct answer because it is a high-strength alloy that offers good corrosion resistance and is commonly used in applications that require high pressure, such as hydraulic systems. It has a tensile strength of 45,000 psi and a yield strength of 40,000 psi, making it suitable for handling pressures up to 3,000 psi. Additionally, the "-T" designation indicates that the alloy has been thermally treated to improve its strength and hardness.