Engineering, Materials And Components Quiz

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  • 1/229 Questions

    The factor which must be considered prior to selecting the best method to produce a closed die forging is:

    • The size of the forging
    • The production quantity
    • The design of the forging
    • All of the above
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About This Quiz

When you think of an engineer you may see people with the power to create that which most of us cannot and this is thanks to thousands of hours of study and practice. Are you an engineering student? Below are some test questions for Materials and Processes exams. It is very helpful in your studying for CGSB exams. Give it See morea shot!

Engineering, Materials And Components Quiz - Quiz

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  • 2. 

    The material used for making a pattern depends on:

    • The type of material that will be cast

    • The grain structure desired in the finished casting

    • The expected production quantity

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The material used for making a pattern depends on multiple factors. Firstly, it depends on the type of material that will be cast, as different materials may require different patterns to achieve the desired shape and dimensions. Secondly, the grain structure desired in the finished casting also influences the choice of pattern material, as certain materials may be better suited for creating specific grain structures. Lastly, the expected production quantity plays a role, as patterns made from certain materials may be more cost-effective or durable for high-volume production. Therefore, all of the above factors affect the selection of pattern material.

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  • 3. 

    The factor which must be considered prior to selecting the hammer or press to produce a closed-die forging is:

    • The size of the forging

    • The production quantity

    • The design of the forging

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The factor that must be considered prior to selecting the hammer or press to produce a closed-die forging is all of the above. This means that the size of the forging, the production quantity, and the design of the forging are all important factors to consider when choosing between a hammer or press. The size of the forging will determine the capacity and capabilities of the equipment needed. The production quantity will influence the efficiency and speed of the process. And the design of the forging will determine the complexity and intricacy of the equipment required. Considering all these factors is crucial to ensure the successful production of a closed-die forging.

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  • 4. 

    The material used for making a pattern depends on:

    • The type of material that will be cast

    • The grain structure desired in the finished casting

    • The expected production quantity

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The material used for making a pattern depends on several factors. Firstly, it depends on the type of material that will be cast. Different materials have different properties and requirements, so the pattern material should be compatible with the casting material. Secondly, the grain structure desired in the finished casting is also a crucial factor. The pattern material should be able to create the desired grain structure in the casting. Lastly, the expected production quantity is important as it affects the durability and cost-effectiveness of the pattern material. Therefore, all of the above factors play a role in determining the material used for making a pattern.

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  • 5. 

    Like ingots, welds can contain porosity:

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Welds can contain porosity, which refers to the presence of small voids or gas pockets within the weld. This can occur due to a variety of factors such as improper shielding gas, inadequate cleaning of the base metal, or incorrect welding parameters. Porosity can weaken the weld and make it more susceptible to cracking or failure. Therefore, it is important to ensure proper welding techniques and parameters to minimize the occurrence of porosity in welds.

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  • 6. 

    In the beginning all steel is perfect:

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement "In the beginning all steel is perfect" is false. This is because steel, like any other material, can have imperfections or defects from the start, such as impurities or inconsistencies in its composition. These imperfections can affect the strength, durability, and overall quality of the steel. Therefore, it is incorrect to assume that all steel is perfect from the beginning.

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  • 7. 

    Cracks may occur at any stage of manufacturing

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Cracks can occur at any stage of manufacturing due to various factors such as material defects, improper handling, excessive stress, or temperature changes. These cracks can compromise the structural integrity and quality of the product. Therefore, it is important to carefully monitor and control the manufacturing process to minimize the occurrence of cracks.

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  • 8. 

    Which of the following factors can have a negative influence on some non-destructive tests?

    • Grain size

    • Grain orientation

    • Grain boundary composition

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    All of the factors mentioned (grain size, grain orientation, and grain boundary composition) can have a negative influence on some non-destructive tests. This is because these factors can affect the propagation of waves or the interaction of radiation with the material being tested. For example, variations in grain size or orientation can cause scattering or diffraction of waves, making it difficult to accurately interpret the test results. Similarly, differences in grain boundary composition can affect the transmission or reflection of waves, leading to inaccuracies in the test measurements. Therefore, all of these factors can potentially impact the reliability and accuracy of non-destructive tests.

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  • 9. 

    NDT is a method of locating which of the following:

    • Discontinuations

    • Dislocations

    • Discontinuities

    • Disturbances

    Correct Answer
    A. Discontinuities
    Explanation
    NDT stands for Non-Destructive Testing, which is a method used to inspect and evaluate materials or components without causing any damage. The purpose of NDT is to detect any flaws or defects that may be present in the material. In this context, "discontinuities" refers to any interruptions or inconsistencies in the material's structure or composition. Therefore, NDT is used to locate and identify these discontinuities, such as cracks, voids, or inclusions, which could potentially compromise the integrity or functionality of the material or component being tested.

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  • 10. 

    NDT is used for locating only those discontinuities open to the surface:

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false because NDT (Non-Destructive Testing) is used to detect and locate both surface and subsurface discontinuities in materials. It can identify defects such as cracks, voids, and inclusions that are not necessarily open to the surface. NDT techniques like ultrasonic testing, radiography, and magnetic particle inspection can penetrate the material and detect internal flaws, making it possible to identify discontinuities that are not visible on the surface.

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  • 11. 

    Elements may be added to the filler metal to:

    • Control gain growth

    • Increase ductility

    • Assure adequate corrosion resistance

    • Any of the above

    Correct Answer
    A. Any of the above
    Explanation
    The correct answer is "Any of the above." This means that elements may be added to the filler metal for various reasons, including controlling grain growth, increasing ductility, or ensuring adequate corrosion resistance. In other words, the addition of elements to the filler metal can serve multiple purposes and can be done for any of these reasons.

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  • 12. 

    Elements may be added to the filler metal to:

    • Control grain growth

    • Increases ductility

    • Assure adequate corrosion resistance

    • Any of the above

    Correct Answer
    A. Any of the above
    Explanation
    The correct answer is "Any of the above." This means that elements may be added to the filler metal for multiple reasons, including controlling grain growth, increasing ductility, and assuring adequate corrosion resistance. The addition of these elements can serve different purposes depending on the specific requirements of the metal being used.

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  • 13. 

    Possible effect(s) of metal forming is (are) to:

    • Refine the grain structure

    • Improve the mechanical properties

    • Close blow holes which have formed in an ingot

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Metal forming processes such as rolling, forging, and extrusion can have multiple effects on the material. One effect is the refinement of the grain structure, where the metal grains become smaller and more uniform in size, leading to improved mechanical properties. Metal forming can also improve the mechanical properties of the material by increasing its strength, toughness, and hardness. Additionally, metal forming can close blow holes that may have formed during the ingot casting process, resulting in a more defect-free material. Therefore, all of the given options are possible effects of metal forming.

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  • 14. 

    Spot welding is usually performed using:

    • A very low current passed for a very short time

    • A very high current passed for a very short time

    • A very low current passed for a very long time

    • A very high current passed for a very long time

    Correct Answer
    A. A very high current passed for a very short time
    Explanation
    Spot welding is a process where two metal surfaces are joined together by applying heat and pressure. The high current passed for a very short time is the correct answer because it allows for a quick and intense burst of heat, melting the metal surfaces and creating a strong bond. Using a high current ensures that enough heat is generated to melt the metal, while the short duration prevents excessive heating and damage to the surrounding area. This combination of high current and short time is ideal for spot welding as it provides efficient and effective results.

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  • 15. 

    Usually, the most serious type of flaw in metals is/are:

    • Porosity

    • Cracks

    • Inclusions

    • Laminations

    Correct Answer
    A. Cracks
    Explanation
    Cracks are considered the most serious type of flaw in metals because they can significantly weaken the structural integrity of the material. Unlike porosity, which consists of small voids or air pockets, cracks are fractures that extend through the metal, making it prone to failure under stress. Inclusions and laminations, on the other hand, are typically non-uniformities or foreign particles within the metal, which may affect its properties but are generally not as severe as cracks in terms of structural integrity.

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  • 16. 

    What phenomenon(s) may happen in the heat affected zone during the process of fusion welding?

    • Grain growth

    • Change of structure

    • Recrystallization

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    During the process of fusion welding, several phenomena may occur in the heat affected zone. Grain growth refers to the increase in the size of grains in the metal, which can affect its mechanical properties. Change of structure refers to the alteration of the crystal structure in the heat affected zone, which can also impact the material's properties. Recrystallization is the formation of new, strain-free grains in the metal, which can occur due to the high heat generated during welding. Therefore, all of these phenomena can happen in the heat affected zone during fusion welding.

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  • 17. 

    Usually, the most serious type of flaw in metals is/are:

    • Porosity

    • Cracks

    • Inclusions

    • Laminations

    Correct Answer
    A. Cracks
    Explanation
    Cracks are considered the most serious type of flaw in metals because they can significantly weaken the structural integrity of the material. Unlike porosity, which refers to small voids or holes within the metal, cracks are visible separations or fractures that can propagate and lead to catastrophic failure. Inclusions, which are foreign particles or impurities trapped within the metal, can also cause weaknesses but are typically not as severe as cracks. Laminations, which are layers or sheets of material that are not properly bonded, can also compromise the strength of the metal but are generally less critical than cracks.

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  • 18. 

    Level II magnetic particle technicians should always be able to evaluate if an indiction is relevant, false or nonrelevant, and if it is rounded or linear.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    This statement is true because Level II magnetic particle technicians are expected to have a higher level of expertise and knowledge in their field. They should be able to accurately evaluate whether an indication is relevant or not, as well as determine if it is rounded or linear. This skill is important in determining the severity and potential impact of any detected indications, allowing for appropriate action to be taken.

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  • 19. 

    Fatigue cracking is always caused by a single overloading.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Fatigue cracking is not always caused by a single overloading. Fatigue cracking occurs due to repeated loading and unloading cycles, which gradually weaken the material and lead to cracks. It is a progressive process that can be caused by various factors such as fluctuating stress levels, vibrations, and material defects. Therefore, it is not accurate to say that fatigue cracking is always caused by a single overloading.

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  • 20. 

    Non-metallic impurities trapped within the molten metal of a casting are generally called:

    • Blowholes

    • Inclusions

    • Cracks

    • Shrink cavities

    Correct Answer
    A. Inclusions
    Explanation
    Inclusions are non-metallic impurities that are commonly found trapped within the molten metal of a casting. These impurities can include various substances such as oxides, slag, or other foreign materials. Inclusions can negatively affect the mechanical properties and overall quality of the casting, leading to potential defects or weaknesses. Therefore, it is important to minimize the presence of inclusions during the casting process to ensure a high-quality final product.

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  • 21. 

    The purpose of metal forming is to:

    • Refine the grain structure

    • Improve the mechanical properties

    • Close blow holes which have formed in an ingot

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Metal forming is a process used to shape and manipulate metal into desired forms. It involves various techniques such as rolling, forging, and extrusion. The purpose of metal forming is to achieve multiple objectives, including refining the grain structure of the metal, which improves its mechanical properties. Additionally, metal forming can also be used to close blow holes that may have formed in an ingot, ensuring the integrity and quality of the final product. Therefore, the correct answer is "All of the above" as all of these objectives are achieved through metal forming.

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  • 22. 

    Better mechanical properties are obtained with:

    • A fine grain structure

    • A large grain structure

    Correct Answer
    A. A fine grain structure
    Explanation
    A fine grain structure is preferred because it leads to better mechanical properties. In a fine grain structure, the grains are smaller and more closely packed together, resulting in increased strength, hardness, and toughness of the material. This is because the smaller grains offer more grain boundaries, which act as barriers to dislocation movement and enhance the material's resistance to deformation. Additionally, fine grains also improve the material's fatigue resistance and reduce the likelihood of cracks or fractures. Therefore, a fine grain structure is desirable for achieving improved mechanical properties in materials.

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  • 23. 

    A green sand mold is:

    • A sand mold coated with a "green" wash

    • A sand mold mixture made up of sand, clay and water

    • A sand mold not yet ready for casting

    • A sand mold used in the production of cores only

    Correct Answer
    A. A sand mold mixture made up of sand, clay and water
    Explanation
    A green sand mold is a sand mold mixture made up of sand, clay, and water. This mixture is called "green" because it is damp and has a greenish color due to the presence of clay. The sand mold is formed by packing this mixture into a mold cavity and then allowing it to dry and harden before casting. The clay helps to hold the sand particles together and provide the necessary strength and stability for the mold during casting.

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  • 24. 

    Galvanizing is a process of applying to iron and steel products a protective layer of:

    • Tin and tin compounds

    • Zinc and zinc compounds

    • Aluminum and aluminum compounds

    • Copper and copper compounds

    Correct Answer
    A. Zinc and zinc compounds
    Explanation
    Galvanizing is a process that involves applying a protective layer to iron and steel products. This layer helps to prevent corrosion and extends the lifespan of the metal. The correct answer is zinc and zinc compounds because zinc is commonly used in the galvanizing process. Zinc coatings provide excellent protection against rust and corrosion, making it an ideal choice for preserving iron and steel.

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  • 25. 

    Non-metallic materials trapped in solid metal are described as:

    • Porosity

    • Inclusions

    • Seams

    • Laminatinos

    Correct Answer
    A. Inclusions
    Explanation
    Inclusions refer to non-metallic materials that are trapped within a solid metal. These materials can include impurities, oxides, or other foreign substances that are incorporated into the metal during the manufacturing process. Inclusions can have a negative impact on the mechanical properties of the metal, such as reducing its strength or causing brittleness. Therefore, it is important to minimize the presence of inclusions in order to ensure the quality and reliability of the metal product.

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  • 26. 

    All metals solidify in a ___________ structure.

    • Crystalline

    • Amorphous

    • Molecular

    • Compounded

    Correct Answer
    A. Crystalline
    Explanation
    Metals solidify in a crystalline structure because their atoms arrange themselves in a regular, repeating pattern called a crystal lattice. This arrangement allows for the efficient packing of atoms, resulting in the characteristic properties of metals such as high conductivity, malleability, and ductility. In contrast, amorphous structures lack long-range order, molecular structures consist of discrete molecules, and compounded structures involve the combination of different elements or compounds.

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  • 27. 

    A non-consumable electrode used for arc welding would be made of:

    • Tungsten

    • Steel

    • Copper

    • Titanium

    Correct Answer
    A. Tungsten
    Explanation
    A non-consumable electrode used for arc welding would be made of tungsten because it has a high melting point and excellent heat resistance. Tungsten is able to withstand the extreme temperatures generated during the welding process without melting or being consumed, making it an ideal choice for non-consumable electrodes.

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  • 28. 

    Which of the following properties is controlled by the electrons in the atom?

    • The electrical conductivity

    • The density

    • The tensile strength

    • The ductility

    Correct Answer
    A. The electrical conductivity
    Explanation
    The electrical conductivity of a material is determined by the movement of electrons within its atoms. When electrons are free to move, such as in metals, they can carry an electric current, resulting in high electrical conductivity. Therefore, the electrons in an atom control the electrical conductivity of a material.

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  • 29. 

    The following gas is used intensively for shielding in the gas tungsten-arc welding process:

    • Radon

    • Oxygen

    • Argon

    • Hydrogen

    Correct Answer
    A. Argon
    Explanation
    Argon is used intensively for shielding in the gas tungsten-arc welding process. This is because argon is an inert gas, meaning it does not readily react with other elements. In welding, argon is used to create a protective atmosphere around the weld area, preventing the molten metal from reacting with the surrounding air and forming unwanted oxides or other impurities. Argon also helps to stabilize the electric arc and improve the quality of the weld.

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  • 30. 

    A forging defect caused by the metal being folded over and forced into the surface but not welded to form a single piece is called:

    • A hot tear

    • A forging lap

    • A burst

    • A forging crack

    Correct Answer
    A. A forging lap
    Explanation
    A forging lap is a defect that occurs during the forging process when the metal is folded over and forced into the surface but not properly welded to form a single piece. This results in a visible seam or overlap on the surface of the forged part. This defect weakens the integrity of the forged piece and can lead to failure under stress.

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  • 31. 

    Grinding cracks can be caused by:

    • Lack of, or poor coolant

    • Dull, or improper grinding wheel

    • A too heavy cut

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Grinding cracks can be caused by a lack of or poor coolant, as insufficient cooling can lead to overheating and subsequent cracking. Dull or improper grinding wheels can also cause cracks, as they may not effectively remove material and instead generate excessive heat. Additionally, a too heavy cut can result in increased heat and stress, leading to cracks. Therefore, all of the mentioned factors can contribute to the occurrence of grinding cracks.

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  • 32. 

    In spot resistance welding, pressure used may be:

    • Mechanical

    • Pneumatic

    • Hydraulic

    • Any of the above

    Correct Answer
    A. Any of the above
    Explanation
    In spot resistance welding, the pressure used may be mechanical, pneumatic, or hydraulic. This means that any of these methods can be employed to apply pressure during the welding process. The choice of pressure method may depend on various factors such as the size and type of the workpiece, the desired welding strength, and the available equipment. Therefore, the pressure used in spot resistance welding can vary and is not limited to a specific method.

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  • 33. 

    Heat treating might cause discontinuities which would probably start at:

    • Heavy and light junctions and sharp areas

    • Smooth surfaces

    • Concave surfaces

    • Within the heavy part of the casting

    Correct Answer
    A. Heavy and light junctions and sharp areas
    Explanation
    Heat treating can cause discontinuities, which are irregularities or imperfections in the material. These discontinuities are more likely to occur at heavy and light junctions and sharp areas. This is because these areas have a higher likelihood of experiencing stress concentrations during the heat treatment process, leading to the formation of cracks or other defects. Smooth surfaces and concave surfaces are less prone to stress concentrations, making them less likely to develop discontinuities. Similarly, within the heavy part of the casting, the material is more likely to experience higher levels of stress during heat treatment, increasing the chances of discontinuities forming.

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  • 34. 

    A hot tear in a casting is a crack.  It could occur:

    • Within the heavy part of the casting

    • In the light section of the casting

    • At junctions of light and heavy castings

    • At the header

    Correct Answer
    A. At junctions of light and heavy castings
    Explanation
    A hot tear in a casting refers to a crack that occurs during the cooling process. These cracks are more likely to happen at junctions where there is a transition from a lighter section to a heavier section in the casting. This is because the differential cooling rates between the two sections create internal stresses, leading to the formation of cracks. Therefore, the answer "At junctions of light and heavy castings" is correct as it accurately identifies a common location for hot tears to occur in a casting.

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  • 35. 

    In the Prayer of Hannah (1 Samuel 2:1-10), what is the primary theme of her prayer?

    • Gratitude for wealth

    • Acknowledging God's power and justice

    • Prayers for vengeance

    • Request for more children

    Correct Answer
    A. Acknowledging God's power and justice
    Explanation
    The Prayer of Hannah is a song of thanksgiving in which she praises God's sovereignty, justice, and power. After God answers her prayer for a son, she acknowledges that God raises the humble and brings down the proud, recognizing His role in justice and deliverance. It reflects her gratitude and the recognition of God's divine will in her life.

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  • 36. 

    The top portion of a molding flask is called a:

    • Cope

    • Drag

    • Cheek

    • Separator

    Correct Answer
    A. Cope
    Explanation
    The top portion of a molding flask is called a "Cope".

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  • 37. 

    The reason an ingot used as forging stock is subjected to more than the minimum hot working required to develop contour is to:

    • Remove evidence of cast structure

    • Refine grain structure

    • Impose a more desirable grain direction

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The reason an ingot used as forging stock is subjected to more than the minimum hot working required to develop contour is to remove evidence of cast structure, refine grain structure, and impose a more desirable grain direction. By subjecting the ingot to additional hot working, any remnants of the original cast structure can be eliminated, resulting in a more uniform and consistent material. This additional hot working also helps in refining the grain structure, making it finer and more homogeneous. Furthermore, by controlling the direction of the grain flow through hot working, a more desirable grain direction can be imposed, enhancing the mechanical properties of the forged part.

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  • 38. 

    In its original shape, porosity would appear:

    • Elongated

    • Irregular

    • Round or nearly round

    • Square

    Correct Answer
    A. Round or nearly round
    Explanation
    Porosity refers to the presence of small openings or voids in a material. When a material is in its original shape, these openings are typically formed in a round or nearly round shape. This is because the material is naturally molded or shaped in a way that allows for the formation of rounded voids. Irregular or elongated shapes are less likely to occur in the original form of porosity. Square shapes are even less likely as they require specific external factors or interventions to be formed. Therefore, the most appropriate option for the appearance of porosity in its original shape is round or nearly round.

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  • 39. 

    Non-metallic inclusions are:

    • Round in shape

    • Rectangular in shape

    • Irregular in shape

    • Tall

    Correct Answer
    A. Irregular in shape
    Explanation
    Non-metallic inclusions are irregular in shape because they are formed during the solidification process of metals and alloys. These inclusions can be various types of non-metallic substances, such as oxides, sulfides, or carbides, that are trapped within the metal matrix. Due to their random formation, these inclusions do not have a specific shape or pattern. Their irregular shape can affect the mechanical properties of the metal, leading to potential weaknesses or defects. Therefore, it is important to control and minimize the presence of non-metallic inclusions in order to improve the overall quality and performance of the metal.

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  • 40. 

    A cause of gas porosity in welds is:

    • Welding at too low of a temperature

    • Improper cleaning or preheating

    • The use of insufficient filler material

    • Restriction of movement of the material

    Correct Answer
    A. Improper cleaning or preheating
    Explanation
    Improper cleaning or preheating can cause gas porosity in welds. When the surface of the material is not properly cleaned before welding, contaminants such as dirt, oil, or rust can be trapped in the weld, leading to the formation of gas pockets. Additionally, if the material is not preheated to the correct temperature, moisture or other volatile substances may vaporize and create gas bubbles during the welding process. These gas bubbles can weaken the weld and result in porosity. Therefore, proper cleaning and preheating are crucial to prevent gas porosity in welds.

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  • 41. 

    The fuel gas most commonly used in gas welding is:

    • Butane

    • Propane

    • Acetylene

    • All of the above

    Correct Answer
    A. Acetylene
    Explanation
    Acetylene is the most commonly used fuel gas in gas welding because of its high heat output and versatility. It has a high flame temperature, allowing for efficient welding and cutting. Acetylene is also easily controllable, making it suitable for various types of welding applications. Additionally, it can be used with different types of metals and alloys, making it a versatile choice for gas welding.

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  • 42. 

    Cold shuts are most likely to be found in:

    • Extrusions

    • Forgings

    • Castings

    • Sintered parts

    Correct Answer
    A. Castings
    Explanation
    Cold shuts are most likely to be found in castings. A cold shut occurs when two portions of molten metal do not properly fuse together during the solidification process. This can happen when there is insufficient heat or fluidity in the metal, causing a lack of fusion between the two sections. Castings involve pouring molten metal into a mold, and if the metal does not properly fuse during solidification, cold shuts can occur. Cold shuts are less common in extrusions, forgings, and sintered parts, making castings the most likely option.

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  • 43. 

    The grain size in a material may be controlled by:

    • The cooling rate from the liquid to solid state

    • The amount of cold working

    • Heat treatment for allotropic materials

    • Any of the above

    Correct Answer
    A. Any of the above
    Explanation
    The grain size in a material can be controlled by various factors, including the cooling rate from the liquid to solid state, the amount of cold working, and heat treatment for allotropic materials. The cooling rate affects the formation of grains during solidification, with slower cooling rates resulting in larger grains. Cold working, such as rolling or forging, can refine the grain size by inducing plastic deformation. Heat treatment techniques, such as annealing or quenching, can also influence the grain size in allotropic materials. Therefore, any of the mentioned factors can be used to control the grain size in a material.

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  • 44. 

    In the shielded metal-arc process, the covering material:

    • Protects the metal from picking-up nitrogen during melting and transfer across the arc

    • Serves as alloying elements to the weld

    • Protects the metal from oxidation during melting

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The correct answer is "All of the above". In the shielded metal-arc process, the covering material serves multiple purposes. It protects the metal from picking up nitrogen during melting and transfer across the arc, which can lead to brittleness in the weld. The covering material also acts as alloying elements, adding desirable properties to the weld. Additionally, it protects the metal from oxidation during melting, preventing the formation of oxides that could weaken the weld. Therefore, all of these statements are true.

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  • 45. 

    Patterns used to prepare molds for casting are made of:

    • Wood

    • Aluminum alloy

    • Epoxy resin

    • Any of the above

    Correct Answer
    A. Any of the above
    Explanation
    Patterns used to prepare molds for casting can be made of wood, aluminum alloy, or epoxy resin. Wood is a common material used for pattern making due to its availability, ease of shaping, and cost-effectiveness. Aluminum alloy patterns are used when a higher level of precision and durability is required. Epoxy resin patterns offer excellent dimensional stability and can be used for complex shapes. Therefore, any of the above materials can be used depending on the specific requirements of the casting process.

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  • 46. 

    Pressure welding can be accomplished with pressure alone, but what else is usually added?

    • Heat

    • Filler material

    • Oxides

    • Adhesives

    Correct Answer
    A. Heat
    Explanation
    Pressure welding involves using pressure to join two materials together. While pressure alone can achieve a bond, the addition of heat is typically necessary to facilitate the welding process. Heat helps to soften the materials, allowing them to fuse together more easily and effectively. Therefore, heat is usually added in pressure welding to ensure a strong and durable bond between the materials.

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  • 47. 

    An alloy is a substance composed of:

    • At least three elements, two of which are metals

    • At least three elements, one of which must be a non-metal

    • Two or more elements, of which at least one is a metal

    • Two or more elements, of which at least one is a non-metal

    Correct Answer
    A. Two or more elements, of which at least one is a metal
    Explanation
    An alloy is a substance that is made up of two or more elements, and it must contain at least one metal. This means that the correct answer is "Two or more elements, of which at least one is a metal."

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  • 48. 

    Which term best describes what is sought by NDT?

    • Surface irregularities

    • Sub-surface holes and cracks

    • Any breaks in the continuity of metal structure

    • Any welding defect

    Correct Answer
    A. Any breaks in the continuity of metal structure
    Explanation
    The term "Any breaks in the continuity of metal structure" best describes what is sought by NDT (Non-Destructive Testing). NDT is a method used to inspect and evaluate materials and components without causing damage. It is specifically used to identify any breaks or discontinuities in the metal structure, such as cracks, voids, or other defects that may affect the integrity or performance of the material. This term encompasses a broader range of potential defects than the other options provided, making it the most accurate description of what NDT aims to detect.

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  • 49. 

    When metals solidify:

    • Atoms become more mobile thus allowing them to migrate to definite positions within a crystal

    • Atoms lose mobility and assume fixed positions in the space lattice of the unit cell

    • A curie point is reached where crystals begin to grow

    • A curie point is reached where grain boundaries begin to form

    Correct Answer
    A. Atoms lose mobility and assume fixed positions in the space lattice of the unit cell
    Explanation
    When metals solidify, the atoms lose their mobility and assume fixed positions in the space lattice of the unit cell. This means that the atoms become locked into a specific arrangement within the crystal structure. As the metal cools and solidifies, the atoms slow down and eventually come to a stop, settling into their designated positions. This fixed arrangement is what gives metals their characteristic crystalline structure.

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Quiz Review Timeline (Updated): Jan 15, 2025 +

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  • Jan 15, 2025
    Quiz Edited by
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  • Apr 25, 2014
    Quiz Created by
    Suchanjv
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