Engineering, Materials And Components Quiz
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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 a shot!
- 1.
As hot working progresses, the energy required for further processing (assuming the temperature of the part is held constant):
- A.
Increases
- B.
Decreases
- C.
Remains constant
- D.
Any one of the above may be true, depending on material.
Correct Answer
D. Any one of the above may be true, depending on material.Explanation
The energy required for further processing in hot working can vary depending on the material being worked on. Some materials may require more energy as the process progresses, while others may require less or the energy requirement may remain constant. Therefore, any of the given options could be true depending on the specific material being used.Rate this question:
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- 2.
A fatigue crack is a service defect that is caused by a:
- A.
Cyclic loading of the part above the yield strength of the material.
- B.
Cyclic loading of the part below the yield strength of the material.
- C.
Local overheating of the part.
- D.
Corrosive atmosphere
Correct Answer
B. Cyclic loading of the part below the yield strength of the material.Explanation
A fatigue crack is caused by cyclic loading of the part below the yield strength of the material. When a material is subjected to repeated loading and unloading, stresses are generated within the material. If these stresses are below the yield strength of the material, they can cause the formation and propagation of cracks over time. This is known as fatigue failure. Cyclic loading above the yield strength can cause plastic deformation and yield, but it is not the main cause of fatigue cracks. Local overheating and corrosive atmosphere can lead to other types of damage, but they are not specifically related to fatigue cracks.Rate this question:
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- 3.
The middle portion of a molding flask is called a:
- A.
Cope
- B.
Drag
- C.
Cheek
- D.
Separator
Correct Answer
C. CheekExplanation
The middle portion of a molding flask is called a cheek. The cheek is the section of the flask that separates the cope (top) and drag (bottom) portions. It provides support and stability to the mold during the casting process. The cheek is typically made of a sturdy material such as metal or wood to withstand the pressure and heat of the molten metal.Rate this question:
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- 4.
A cause of gas porosity in welds is:
- A.
Welding at too low of a temperature
- B.
Improper cleaning or preheating
- C.
The use of insufficient filler material
- D.
Restriction of movement of the material
Correct Answer
B. Improper cleaning or preheatingExplanation
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.Rate this question:
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- 5.
In the resistance welding process:
- A.
Two parts to be joined are heated then pressure is applied.
- B.
The pieces to be joined are held firmly together under pressure, followed by the generation of heat at the interface.
- C.
No heat is applied and the parts are welded by applying pressure only.
- D.
The parts are heated but not melted and a filler metal is added.
Correct Answer
B. The pieces to be joined are held firmly together under pressure, followed by the generation of heat at the interface.Explanation
In the resistance welding process, the correct answer states that the pieces to be joined are held firmly together under pressure, followed by the generation of heat at the interface. This is the accurate explanation of the resistance welding process. The pressure applied helps to ensure that the pieces are securely held together, and the generation of heat at the interface allows for the welding of the two parts. This process does not involve melting the parts or adding a filler metal, but rather relies on the application of pressure and heat to create a strong weld.Rate this question:
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- 6.
In a mold, the runner connects:
- A.
The pouring basin to the sprue
- B.
The downgate to the riser
- C.
The sprue to the ingate
- D.
The pouring basin to the mold cavity
Correct Answer
C. The sprue to the ingateExplanation
The sprue is the channel through which the molten material flows from the pouring basin into the mold cavity. The ingate, on the other hand, is the entry point of the molten material into the mold cavity from the sprue. Therefore, it is logical for the sprue to be connected to the ingate in order to facilitate the flow of material into the mold cavity.Rate this question:
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- 7.
Metal forming such as rolling, results in:
- A.
Plastic flow of the metal
- B.
Elongation of existing defects perpendicular to the rolling direction
- C.
Directional properties which is always beneficial for secondary forming operations.
- D.
The flattening out of defects which makes them more easily detectable by most NDT methods
Correct Answer
A. Plastic flow of the metalExplanation
Rolling involves applying compressive forces to deform metal, causing it to undergo plastic deformation. This plastic flow allows the metal to change shape without fracturing, resulting in desired changes in thickness, length, or shape.Rate this question:
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- 8.
A welding defect that occurs at the root and runs parallel with the weld is:
- A.
Lack of fusion between beads
- B.
Icicle
- C.
A crater crack
- D.
Lack of penetration
Correct Answer
D. Lack of penetrationExplanation
Lack of penetration refers to a welding defect where the weld does not fully penetrate the base metal, resulting in an incomplete bond. This defect occurs at the root of the weld and runs parallel to it. It can weaken the joint and compromise its structural integrity.Rate this question:
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- 9.
Hot working an ingot may produce a product which has:
- A.
Fewer defects than in the original ingot
- B.
More defects than the original ingot
- C.
The same number of defects as in the original ingot
- D.
Any of the above may be correct depending on the circumstances.
Correct Answer
D. Any of the above may be correct depending on the circumstances.Explanation
Hot working an ingot involves subjecting it to high temperatures and mechanical deformation, such as rolling or forging, to shape it into a desired product. The process of hot working can lead to changes in the microstructure of the material, which may result in the formation of new defects or the elimination of existing defects. Therefore, depending on the specific circumstances, hot working can either reduce the number of defects in the original ingot, introduce more defects, or maintain the same number of defects in the final product.Rate this question:
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- 10.
A disadvantage of dry sand molds when compared to green sand molds is:
- A.
Erosion of the mold is more common
- B.
Castings are more susceptible to hot tears
- C.
A surface finish is generally worse.
- D.
Overall dimensional accuracy is worse
Correct Answer
A. Erosion of the mold is more commonExplanation
Dry sand molds are made from a mixture of sand and binders, which do not contain moisture. This lack of moisture makes the mold more prone to erosion when compared to green sand molds, which have a higher moisture content. Erosion can occur due to the high temperatures and pressures involved in the casting process, causing the mold to break down and deteriorate more easily. This can lead to a shorter lifespan for the mold and potentially affect the quality and integrity of the casting.Rate this question:
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- 11.
A long defect, parallel to the longitudinal axis of a bar and caused by blowholes, cracks or tears introduced in earlier processing and elongated in the direction of rolling or forging is called:
- A.
A seam
- B.
A forging lap
- C.
A lamination
- D.
A cold shut
Correct Answer
A. A seamExplanation
A seam is a long defect that runs parallel to the longitudinal axis of a bar. It is caused by blowholes, cracks, or tears that were introduced in earlier processing and then elongated in the direction of rolling or forging.Rate this question:
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- 12.
Rapid oxidation of metal surfaces during hot working of a mild steel may;
- A.
Produce a carburized surface layer
- B.
Produce a product which is thicker then originally intended
- C.
Adversely affect the cooling rate of the newly formed material
- D.
Adversely affect the application of some non-destructive test
Correct Answer
D. Adversely affect the application of some non-destructive testExplanation
During hot working of mild steel, rapid oxidation of metal surfaces can create a layer of oxide on the surface. This oxide layer can interfere with the application of certain non-destructive tests, such as visual inspection or ultrasonic testing, as it can obscure or distort the results. Therefore, the rapid oxidation can adversely affect the application of some non-destructive tests.Rate this question:
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- 13.
An advantage of shell molding over green sand molding is:
- A.
Larger castings can be produced using shell molds
- B.
Lower cost of production of shell molding
- C.
Better surface finish is obtainable
- D.
All of the above
Correct Answer
C. Better surface finish is obtainableExplanation
Shell molding offers better surface finish compared to green sand molding. This is because the shell mold process involves using a resin-coated mold, which creates a smoother and more precise surface on the casting. Green sand molding, on the other hand, uses a mixture of sand, clay, and water, which can result in a rougher surface finish. Therefore, the advantage of shell molding over green sand molding is that it allows for a better surface finish on the castings.Rate this question:
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- 14.
A burst is _____________ discontinuity.
- A.
An inherent
- B.
A processing
- C.
A service
- D.
All of the above
Correct Answer
B. A processingExplanation
A burst is a processing discontinuity.Rate this question:
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- 15.
Bursts usually have the following characteristics:
- A.
Appear as smooth indentations on metal surfaces
- B.
Are cavities varying in size from wide open to very tight, usually parallel with the grain
- C.
Are extremely thin and flat, generally aligned parallel to the work surface of the material
- D.
Are three dimensional discontinuities having smooth internal surfaces and generally located close to the surface of the wrought material
Correct Answer
D. Are three dimensional discontinuities having smooth internal surfaces and generally located close to the surface of the wrought materialExplanation
Bursts are described as three-dimensional discontinuities with smooth internal surfaces that are typically situated near the surface of the wrought material. They appear as smooth indentations on metal surfaces and are cavities of varying sizes, usually parallel to the grain. Bursts are extremely thin and flat, aligning parallel to the work surface of the material.Rate this question:
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- 16.
In a rolling mill, flattening and elongation of metal is accomplished by:
- A.
Tensile stresses
- B.
Bending stresses
- C.
Primarily compressive stresses
- D.
High frequency cyclical loads
Correct Answer
C. Primarily compressive stressesExplanation
In a rolling mill, flattening and elongation of metal is primarily accomplished by applying compressive stresses. This is because the metal is passed through a series of rollers that exert pressure on it, causing it to deform and elongate. The compressive stresses help to reduce the thickness of the metal and increase its length. Tensile stresses, bending stresses, and high frequency cyclical loads may also play a role in the process, but the primary mechanism for flattening and elongation is the application of compressive stresses.Rate this question:
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- 17.
The fuel gas most commonly used in gas welding is:
- A.
Butane
- B.
Propane
- C.
Acetylene
- D.
All of the above
Correct Answer
C. AcetyleneExplanation
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.Rate this question:
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- 18.
Cold shuts are most likely to be found in:
- A.
Extrusions
- B.
Forgings
- C.
Castings
- D.
Sintered parts
Correct Answer
C. CastingsExplanation
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.Rate this question:
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- 19.
Aircraft turbine blades are usually processed by:
- A.
Investment casting
- B.
Shell mold casting
- C.
Green sand casting
- D.
Dry sand casting
Correct Answer
A. Investment castingExplanation
Investment casting is the most suitable method for processing aircraft turbine blades because it allows for the production of complex shapes with high dimensional accuracy and a smooth surface finish. This process involves creating a wax pattern of the desired blade shape, which is then coated with a ceramic material. The ceramic shell is heated to remove the wax, leaving behind a hollow mold. Molten metal is then poured into the mold, filling the cavity and solidifying to form the turbine blade. This method ensures the blades have the necessary strength, durability, and aerodynamic efficiency required for their function in an aircraft engine.Rate this question:
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- 20.
The electrodes used for spot welding are usually made of:
- A.
Carbon
- B.
Mild Steel
- C.
Tungsten
- D.
Copper
Correct Answer
D. CopperExplanation
Copper is the preferred material for electrodes used in spot welding due to its high electrical conductivity and thermal conductivity. These properties allow for efficient transfer of electrical energy and effective dissipation of heat during the welding process. Copper electrodes also have good resistance to wear and deformation, ensuring longer electrode life and consistent weld quality. Additionally, copper does not contaminate the weld, making it suitable for welding a wide range of materials.Rate this question:
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- 21.
A metal forming operation which allows three dimensional control over the shape of the product is:
- A.
Rolling
- B.
Extruding
- C.
Forging
- D.
All of the above
Correct Answer
C. ForgingExplanation
Forging is a metal forming operation that allows three-dimensional control over the shape of the product. It involves heating the metal and then applying compressive forces to shape it into the desired form. This process allows for precise control over the dimensions and contours of the final product, making it an ideal choice when three-dimensional control is required. Rolling and extruding are also metal forming operations, but they do not offer the same level of control over the shape as forging does.Rate this question:
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- 22.
A forming operation which results in the greatest dimensional accuracy is:
- A.
Cold rolling of sheet
- B.
Hot rolling of sheet
- C.
Cold rolling of bars
- D.
Forging
Correct Answer
D. ForgingExplanation
Forging is the correct answer because it is a forming operation that involves shaping the material by applying compressive forces. The process of forging involves heating the material and then applying pressure to shape it into the desired form. This method allows for precise control over the dimensions and results in a high level of dimensional accuracy. Cold rolling of sheet, hot rolling of sheet, and cold rolling of bars may also result in dimensional accuracy, but forging is known to provide the greatest level of accuracy.Rate this question:
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- 23.
In which of the following joining methods will flaws, when they do occur, be essentially two dimensional?
- A.
Gas tungsten arc welding
- B.
Gas metal arc welding
- C.
Submerged arc welding
- D.
Brazing
Correct Answer
D. BrazingExplanation
Brazing is a joining method where flaws, when they occur, are essentially two-dimensional. In brazing, a filler metal is melted and flowed into the joint, creating a strong bond between the base metals. The filler metal has a lower melting point than the base metals, allowing it to flow and fill the joint. Flaws in brazing typically occur in the form of surface defects, such as cracks or voids, which are two-dimensional in nature. This is in contrast to the other joining methods mentioned, such as gas tungsten arc welding, gas metal arc welding, and submerged arc welding, where flaws can occur in three dimensions.Rate this question:
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- 24.
A flaw which can resemble a cold shut is:
- A.
An undercut in the weld
- B.
A hot tear in a casting
- C.
A blowhole in a casting
- D.
A forging lap
Correct Answer
D. A forging lapExplanation
A forging lap is a flaw that can resemble a cold shut. A forging lap occurs when a portion of the metal folds over itself during the forging process, creating a defect in the material. This defect can resemble a cold shut, which is a type of discontinuity in a weld where the molten metal does not properly fuse together. Both a forging lap and a cold shut can result in weak points in the material, compromising its structural integrity.Rate this question:
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- 25.
Elements may be added to the filler metal to:
- A.
Control gain growth
- B.
Increase ductility
- C.
Assure adequate corrosion resistance
- D.
Any of the above
Correct Answer
D. Any of the aboveExplanation
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.Rate this question:
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- 26.
One of the main causes of cold shuts is:
- A.
Improper preheating of molds
- B.
The presence of several sprues or gates in the mold
- C.
Pouring without a filter
- D.
The alloy selection
Correct Answer
B. The presence of several sprues or gates in the moldExplanation
The presence of several sprues or gates in the mold can be one of the main causes of cold shuts. When there are multiple sprues or gates in the mold, it can lead to uneven filling of the molten metal, causing the metal to solidify before it completely fills the mold cavity. This results in incomplete fusion of the metal, leading to cold shuts. Cold shuts are defects where two streams of molten metal fail to fuse together properly, resulting in a visible line or seam in the final product.Rate this question:
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- 27.
An EDM notch formed in 304 stainless steel may cause:
- A.
A local increase in permeability
- B.
The formation of austenite around the notch
- C.
An increase in conductivity
- D.
All of the above
Correct Answer
C. An increase in conductivityExplanation
When an EDM (Electrical Discharge Machining) notch is formed in 304 stainless steel, it may cause an increase in conductivity. This is because the EDM process involves the use of high-frequency electrical discharges to erode the material, creating small craters or notches. These notches can disrupt the regular structure of the material, creating more pathways for electrical current to flow through. As a result, the conductivity of the stainless steel increases. However, it is important to note that the other options mentioned in the question, such as a local increase in permeability or the formation of austenite around the notch, are not necessarily caused by the EDM process in 304 stainless steel.Rate this question:
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- 28.
Which discontinuity is not normally found in a casting?
- A.
Misrun
- B.
Porosity
- C.
Shrinkage
- D.
Slugging
Correct Answer
D. SluggingExplanation
Slugging is not normally found in a casting. Misrun refers to a defect where the molten metal does not completely fill the mold cavity. Porosity refers to the presence of small voids or gas pockets in the casting. Shrinkage is a defect caused by the solidification and cooling of the metal, resulting in a reduction in size. However, slugging is not a common discontinuity in castings and is not typically associated with casting defects.Rate this question:
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- 29.
Non-metallic impurities trapped within the molten metal of a casting are generally called:
- A.
Blowholes
- B.
Inclusions
- C.
Cracks
- D.
Shrink cavities
Correct Answer
B. InclusionsExplanation
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.Rate this question:
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- 30.
Most manufacturing defects in a tube are:
- A.
Axial in direction
- B.
Circumferential in direction
- C.
On the outside of the tube
- D.
Subsurface
Correct Answer
A. Axial in directionExplanation
Most manufacturing defects in a tube are axial in direction. This means that the defects occur along the length of the tube, parallel to its axis. Axial defects can include cracks, splits, or deformations that run along the tube's length. These defects are typically caused by issues during the manufacturing process, such as improper heat treatment or insufficient material quality control. Axial defects can have a significant impact on the structural integrity and performance of the tube, making them a critical concern in manufacturing and quality control processes.Rate this question:
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- 31.
Increasing test sample temperature normally:
- A.
Increases electrical resistivity
- B.
Decreases electrical resistivity
- C.
Does not change electrical resistivity
- D.
Increases magnetic permeability
Correct Answer
A. Increases electrical resistivityExplanation
Increasing the test sample temperature normally increases the electrical resistivity. This is because as the temperature increases, the atoms in the material gain more thermal energy and vibrate more vigorously, disrupting the flow of electrons. This increased atomic movement hinders the movement of charge carriers, causing an increase in resistivity.Rate this question:
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- 32.
When thick and thin casting sections are adjacent to each other, what discontinuity may result?
- A.
Porosity
- B.
Inclusions
- C.
Shrinkage
- D.
Core shift
Correct Answer
C. ShrinkageExplanation
When thick and thin casting sections are adjacent to each other, a potential discontinuity that may result is shrinkage. Shrinkage occurs when there is a difference in cooling rates between the thick and thin sections, causing the metal to contract at different rates. This can lead to internal voids or defects in the casting, compromising its structural integrity. Shrinkage is a common issue in casting processes and needs to be carefully managed to ensure high-quality castings.Rate this question:
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- 33.
Heat exchanger tubes are defect prone at regions:
- A.
Adjacent to support plates
- B.
Under support plates
- C.
In-between support plates
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Heat exchanger tubes are prone to defects in regions adjacent to support plates, under support plates, and in between support plates. Support plates are used to hold the tubes in place, and due to the stress and pressure exerted on the tubes in these areas, they are more likely to develop defects. This can include cracks, leaks, or corrosion. Therefore, all of the mentioned regions are susceptible to defects in heat exchanger tubes.Rate this question:
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- 34.
Which of the following discontinuities is not normally associated with a casting?
- A.
Segregation
- B.
Core shift
- C.
Misrun
- D.
Bursts
Correct Answer
D. BurstsExplanation
Bursts are not normally associated with castings. Bursts refer to the rupturing or cracking of the mold during the casting process due to excessive internal pressure. This can result from factors such as improper gating or excessive pouring temperature. However, other discontinuities like segregation, core shift, and misrun are commonly associated with castings. Segregation refers to the non-uniform distribution of alloying elements, core shift occurs when the core is not properly aligned with the mold, and misrun happens when the molten metal does not completely fill the mold cavity.Rate this question:
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- 35.
Which of the following is identified as a casting insert?
- A.
Chaplet
- B.
Mold
- C.
Gate
- D.
Riser
Correct Answer
A. ChapletExplanation
A chaplet is a type of casting insert that is used to support or hold a core in place during the casting process. It is typically made of metal and is placed between the mold and the core to provide support and prevent distortion or movement. Chaplets are commonly used in sand casting and other casting processes to ensure the integrity and accuracy of the final casting.Rate this question:
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- 36.
The work metal for working with a forging hammer is:
- A.
A bloom
- B.
A billet
- C.
A bar
- D.
Any of the above
Correct Answer
D. Any of the aboveExplanation
The work metal for working with a forging hammer can be any of the above options mentioned, which are a bloom, a billet, or a bar. This means that all three forms of metal can be used as the workpiece when using a forging hammer. The choice of which form to use would depend on the specific requirements of the forging process and the desired outcome.Rate this question:
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- 37.
Cold working steel or aluminum results in a decrease in:
- A.
Ductility
- B.
Hardness
- C.
Strength
- D.
All of the above
Correct Answer
A. DuctilityExplanation
Cold working steel or aluminum involves subjecting the material to mechanical stress at low temperatures. This process causes the material to become harder and stronger due to the formation of dislocations and grain boundaries. However, it also leads to a decrease in ductility, which refers to the ability of a material to deform under tensile stress without breaking. Therefore, the correct answer is ductility.Rate this question:
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- 38.
The grain size of ferrous metal is commonly refined by:
- A.
Elastic deformation
- B.
Heat treatment
- C.
High frequency mechanical vibrations
- D.
Both A and B
Correct Answer
B. Heat treatmentExplanation
Heat treatment is a commonly used method to refine the grain size of ferrous metals. During heat treatment, the metal is heated to a specific temperature and then cooled at a controlled rate. This process helps in rearranging the atoms within the metal, resulting in a finer and more uniform grain structure. By controlling the temperature and cooling rate, the grain size can be effectively reduced, leading to improved mechanical properties such as increased strength and hardness. Elastic deformation and high frequency mechanical vibrations are not commonly used methods for refining the grain size of ferrous metals.Rate this question:
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- 39.
A method commonly used to remove a number of flaws in an ingot prior to forming is:
- A.
Cropping
- B.
Heat treating
- C.
Welding
- D.
Sand blasting
Correct Answer
A. CroppingExplanation
Cropping is a method commonly used to remove a number of flaws in an ingot prior to forming. This process involves cutting off the defective or unwanted parts of the ingot, such as cracks, impurities, or uneven surfaces. By removing these flaws, cropping helps to improve the overall quality and integrity of the ingot, making it more suitable for further processing and forming into desired shapes or products. Heat treating, welding, and sand blasting are not typically used for removing flaws in ingots.Rate this question:
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- 40.
Which of the following factors can have a negative influence on some non-destructive tests?
- A.
Grain size
- B.
Grain orientation
- C.
Grain boundary composition
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
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.Rate this question:
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- 41.
The principal purpose of risers in molds is to:
- A.
Feed the castings
- B.
Let air escape from the mold
- C.
Ensure impurities will remain outside the casting
- D.
Favor directional solidification
Correct Answer
A. Feed the castingsExplanation
Risers, also known as feeders, are used in casting processes to provide additional molten metal to compensate for shrinkage during solidification. This helps ensure that the casting fills completely and avoids defects such as shrinkage voids.Rate this question:
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- 42.
The process in which a mold is formed from a mixture of sand and a thermosetting resin binder that is placed against a heated metal pattern is called:
- A.
Dry sand molding
- B.
Permanent mold casting
- C.
Investment casting
- D.
Shell molding
Correct Answer
D. Shell moldingExplanation
Shell molding is the correct answer because it involves the formation of a mold using a mixture of sand and a thermosetting resin binder. This mixture is placed against a heated metal pattern to create the mold. Shell molding is a type of casting process that allows for the production of complex and detailed parts with high dimensional accuracy.Rate this question:
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- 43.
A casting process in which the pattern is not re-usable is called:
- A.
Shell mold casting
- B.
Investment casting
- C.
Sand casting
- D.
Composite mold casting
Correct Answer
B. Investment castingExplanation
Investment casting is a casting process in which a pattern is created from wax or a similar material, and then coated with a ceramic material. The ceramic shell is then heated to remove the wax, leaving behind a hollow cavity in the shape of the desired part. Molten metal is then poured into the cavity, creating the final casting. Unlike other casting processes, investment casting does not involve the use of a reusable pattern. Instead, each pattern is destroyed in the process, making it a non-reusable casting method.Rate this question:
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- 44.
A casting process involving a re-usable mold is called:
- A.
Investment casting
- B.
Shell mold casting
- C.
Dry sand casting
- D.
Die casting
Correct Answer
D. Die castingExplanation
Die casting is the correct answer because it refers to a casting process that involves pouring molten metal into a reusable mold, usually made of steel. The molten metal is forced into the mold under high pressure, allowing for the production of complex shapes with high precision and surface finish. This process is commonly used for manufacturing parts with thin walls, such as automotive components and consumer electronics.Rate this question:
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- 45.
Which of the following welding processes does not involve melting of the parts to be joined?
- A.
Arc welding
- B.
Gas welding
- C.
Pressure welding
- D.
Electron beam welding
Correct Answer
C. Pressure weldingExplanation
Pressure welding does not involve melting of the parts to be joined. In this process, the parts are joined together by applying pressure, without the need for melting. This can be achieved through various methods such as friction, ultrasonic vibrations, or explosives. Pressure welding is commonly used for joining materials that are difficult to melt or materials that have different melting points.Rate this question:
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- 46.
In the shielded metal-arc process, the electrode covering may include materials used to:
- A.
Protect the metal from oxidation during melting and transfer across the arc.
- B.
Protect the weld bead as it solidifies and cools to room temperature
- C.
Alloy the weld metal
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The electrode covering in the shielded metal-arc process serves multiple purposes. Firstly, it protects the metal from oxidation during the melting and transfer process across the arc. This is important to prevent any contamination or weakening of the weld. Secondly, it protects the weld bead as it solidifies and cools to room temperature, ensuring that it maintains its integrity and strength. Lastly, the electrode covering can also be used to alloy the weld metal, adding specific elements to enhance its properties. Therefore, all of the given options are correct.Rate this question:
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- 47.
A non-consumable electrode used for arc welding would be made of:
- A.
Tungsten
- B.
Steel
- C.
Copper
- D.
Titanium
Correct Answer
A. TungstenExplanation
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.Rate this question:
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- 48.
In gas welding, the acetylene is usually burned with:
- A.
Oxygen
- B.
Hydrogen
- C.
Argon
- D.
Nitrogen
Correct Answer
A. OxygenExplanation
In gas welding, acetylene is typically burned with oxygen. This is because acetylene requires oxygen to support combustion and produce a high-temperature flame necessary for welding. Oxygen acts as the oxidizer, reacting with acetylene to generate heat and create a stable flame. Hydrogen, argon, and nitrogen are not commonly used as the primary gas for burning acetylene in gas welding processes.Rate this question:
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- 49.
Which of the following statements is correct?
- A.
The heat affected zone of a weld is basically a homogeneous structure
- B.
In some areas of the weld heat affected zone, grain size can be smaller than in the unaffected base metal
- C.
The temperature in the heat affected zone can sometimes exceed the temperature in the fusion zone
- D.
Transverse cracks do not occur in the heat affected zone
Correct Answer
B. In some areas of the weld heat affected zone, grain size can be smaller than in the unaffected base metalExplanation
This statement is correct because the heat-affected zone (HAZ) is a region of the base metal that has been affected by the heat from welding. In some cases, the HAZ can have variations in microstructure, including changes in grain size, due to the rapid heating and cooling during the welding process. So, it's possible for the grain size to be smaller in some areas of the HAZ compared to the unaffected base metal.Rate this question:
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- 50.
A rupture in the material that can be in any direction on the part and is caused by localized stresses that exceed the tensile strength of the material is:
- A.
A fatigue crack
- B.
A heat treat crack
- C.
A seam
- D.
A stringer
Correct Answer
B. A heat treat crackExplanation
A heat treat crack is a rupture or crack that occurs in a material due to localized stresses that exceed the material's tensile strength, often as a result of the heat treatment process. This process involves heating and cooling metal to alter its physical properties, which can sometimes introduce residual stresses or uneven cooling. If these stresses exceed the tensile strength, cracks may form, potentially in any direction. Heat treat cracks can compromise the integrity and durability of a part, and their formation might require adjustments to heat treatment methods or improved stress-relief processes to prevent reoccurrence. UserRate this question:
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Current Version
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Sep 16, 2024Quiz Edited by
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Apr 25, 2014Quiz Created by
Suchanjv
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