Cwb Level 2 Theory Quiz #1
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Questions and Answers
- 1.
Stress cracking is most likely to occur when welding thick material. This is due to:
- A.
Undercutting and nicking
- B.
Decreased cooling effect
- C.
Hydrogen embrittlement
- D.
Increased cooling effect
Correct Answer
D. Increased cooling effectExplanation
Stress cracking is most likely to occur when welding thick material because of the increased cooling effect. When thick material is welded, it takes longer for the heat to dissipate, causing the weld to cool at a slower rate. This slower cooling can lead to the formation of residual stresses in the material, which can result in stress cracking.Rate this question:
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- 2.
In producing a drawing for a scale of 1:20, what would the distance represented by a distance on the drawing of 6 inches be:
- A.
120 feet
- B.
12 inches
- C.
12 feet
- D.
120 inches
Correct Answer
D. 120 inchesExplanation
In a scale of 1:20, it means that every inch on the drawing represents 20 inches in real life. Therefore, if a distance of 6 inches is represented on the drawing, the actual distance it represents would be 6 inches multiplied by 20, which equals 120 inches.Rate this question:
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- 3.
The best form of distortion control when placing fillet welds on a long T-joint is:
- A.
Rigid clamping
- B.
Welding sequence
- C.
Sub assembly
- D.
Prebending or setting
Correct Answer
B. Welding sequenceExplanation
The correct answer is "Welding sequence." When placing fillet welds on a long T-joint, the welding sequence refers to the order in which the welds are made. This is important because it helps to minimize distortion and warping of the joint. By starting at one end and gradually moving towards the other end, the heat input is evenly distributed, allowing for better control of the welding process and reducing the chances of distortion.Rate this question:
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- 4.
If the current is a flow of electrons they move in what direction:
- A.
From positive to negative
- B.
From negative to positive
- C.
They alternate each half cycle
- D.
They flow on positive side of neutral line
Correct Answer
B. From negative to positiveExplanation
The flow of electrons in a current is from negative to positive. This is because electrons, which carry a negative charge, are attracted to the positive terminal of a power source. Therefore, they move towards the positive terminal, creating an electric current. This is the opposite direction of conventional current, which assumes the flow of positive charges from positive to negative.Rate this question:
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- 5.
The type of power source with a drooping volt-amp characteristic is:
- A.
C.A.V.
- B.
C.C.
- C.
C.P.
- D.
C.V.
Correct Answer
B. C.C.Explanation
A power source with a drooping volt-amp characteristic refers to a constant current (C.C.) power source. In this type of power source, the current remains constant while the voltage decreases as the load increases. This characteristic is useful in applications where a constant current is required, such as in certain types of lighting or in charging batteries.Rate this question:
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- 6.
That portion of the joint to be welded where the members are closest to each other is termed:
- A.
Root edge
- B.
Root face
- C.
Root gap
- D.
Root opening
Correct Answer
C. Root gapExplanation
The term "root gap" refers to the distance between the root faces of the joint to be welded. It represents the space between the two pieces of metal at the root of the weld, where the members are closest to each other. The root gap plays a critical role in welding as it determines factors such as weld penetration, fusion, and overall weld quality. Ensuring the appropriate root gap is essential for achieving proper weld strength and integrity.Rate this question:
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- 7.
What is the primary purpose of a welding procedure specification (WPS)?
- A.
To outline the welder's qualifications
- B.
To provide a detailed plan for producing a sound weld
- C.
To specify the inspection methods for welded joints
- D.
To record the results of weld inspections
Correct Answer
B. To provide a detailed plan for producing a sound weldExplanation
A Welding Procedure Specification (WPS) is a document that provides detailed instructions on how to perform a specific weld to ensure it meets the required standards. It outlines parameters such as welding process, materials, and techniques, ensuring consistent and high-quality welds.Rate this question:
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- 8.
How many principal views are there in an orthographic drawing:
- A.
3
- B.
4
- C.
5
- D.
6
Correct Answer
A. 3Explanation
In an orthographic drawing, there are three principal views. These views include the front view, top view, and right-side view. These views are essential in accurately representing the object or structure being depicted. The front view shows the object's front face, the top view shows the object from above, and the right-side view shows the object from the right side. These three views provide a comprehensive understanding of the object's shape, size, and proportions.Rate this question:
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- 9.
If the time taken to pass through zero is minimized, there is a better chance the plasma will not completely collapse and the arc can be re-established. This system for improving arc stability in G.T.A.W. with A.C. is known as:
- A.
Correcting for unbalanced circuit
- B.
Waveform shaping
- C.
Surge injection
- D.
High frequency attenuation
Correct Answer
B. Waveform shapingExplanation
Waveform shaping refers to the process of manipulating the shape of the electrical waveform in order to improve arc stability in G.T.A.W. with A.C. By minimizing the time taken to pass through zero, the plasma is less likely to collapse completely, allowing the arc to be re-established. This technique helps in maintaining a stable and continuous arc during the welding process.Rate this question:
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- 10.
The type of gas formed by the interaction of ultraviolet light, emitted from the arc, with the oxygen in the air is:
- A.
Phosgene
- B.
Carbon Monixide
- C.
Ozone
- D.
Carbon Dioxide
Correct Answer
C. OzoneExplanation
Ultraviolet light emitted from the arc can interact with oxygen in the air to form ozone. Ozone is a gas composed of three oxygen atoms, and it is formed when oxygen molecules (O2) are broken apart by the energy from the ultraviolet light. The resulting oxygen atoms (O) can then react with other oxygen molecules to form ozone (O3). Ozone is an important component of the Earth's atmosphere, as it helps to absorb harmful ultraviolet radiation from the sun.Rate this question:
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- 11.
The magnitude of current flow is measured in:
- A.
Ohms
- B.
Volts
- C.
Amps
- D.
Watts
Correct Answer
C. AmpsExplanation
The magnitude of current flow is measured in Amps. Amps, or amperes, is the unit of electric current. It represents the rate at which electric charge flows in a circuit. Ohms is the unit of electrical resistance, volts is the unit of electrical potential difference, and watts is the unit of power. While these units are related to current flow, they do not directly measure the magnitude of current.Rate this question:
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- 12.
If a worker is standing next to two machines, each producing a noise level of 95 dBA, what noise level is the worker exposed to:
- A.
92 dBA
- B.
95 dBA
- C.
98 dBA
- D.
190 dBA
Correct Answer
C. 98 dBAExplanation
When a person is exposed to multiple noise sources, the combined noise level is not simply the sum of the individual levels. Instead, you use the formula for combining decibel levels in different conditions:
L_total = L₁ + 10 * log₁₀(N)
where:
L_total is the total noise level,
L₁ is the higher of the two individual noise levels, and
N is the number of noise sources.
In this case, with two machines producing a noise level of 95 dBA each, the total noise level (L_total) would be:
L_total = 95 + 10 * log₁₀(2)
L_total ≈ 95 + 3 ≈ 98 dBA
Therefore, the worker would be exposed to approximately 98 dBA of noise.Rate this question:
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- 13.
If the secondary coil has fewer turns in the primary coil, this is known as what type of transformer:
- A.
Step-up
- B.
Stationary
- C.
Step-down
- D.
Tap-type
Correct Answer
C. Step-downExplanation
A transformer with a secondary coil that has fewer turns than the primary coil is known as a step-down transformer. This type of transformer is designed to decrease the voltage from the primary coil to the secondary coil. It is commonly used in applications where a lower voltage is required, such as in household electrical systems, where it steps down the high voltage from the power grid to a lower voltage suitable for use in homes.Rate this question:
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- 14.
Which of the following fuel gases are lighter than air:
- A.
Propane
- B.
Butane
- C.
Propylene
- D.
Acetylene
Correct Answer
D. AcetyleneExplanation
Acetylene is lighter than air because it has a lower density than air. This means that it will tend to rise and disperse in the atmosphere. Propane, butane, and propylene, on the other hand, are heavier than air and will tend to sink and accumulate in low-lying areas.Rate this question:
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- 15.
When using the G.T.A.W. hot wire process, the power source for filler metal preheat is usually:
- A.
A.C.H.F.
- B.
D.C.E.N.
- C.
A.C.
- D.
D.C.
Correct Answer
C. A.C.Explanation
The G.T.A.W. hot wire process is a welding technique that uses a high-frequency alternating current (A.C.) power source. This power source is used to preheat the filler metal, which helps in achieving a better weld quality. Using an A.C. power source for filler metal preheat is common in this process because it allows for better control of the heat input and ensures uniform heating of the filler metal. Using a direct current (D.C.) power source may not provide the same level of control and uniformity in preheating the filler metal.Rate this question:
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- 16.
The force or pressure with which an electric current is forced through a circuit is known as:
- A.
C.A.V.
- B.
E.M.F.
- C.
C.P.
- D.
Volts
Correct Answer
B. E.M.F.Explanation
The force or pressure with which an electric current is forced through a circuit is known as electromotive force (EMF). EMF is the energy per unit charge supplied by a source, such as a battery, to drive the electric current. It is measured in volts.Rate this question:
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- 17.
A product used in electrode coatings intended to operate on A.C. is:
- A.
Cellulose
- B.
Rutile
- C.
Potassium
- D.
Iron powder
Correct Answer
C. PotassiumExplanation
Potassium is used in electrode coatings intended to operate on A.C. because it has good electrical conductivity and stability at high temperatures. It helps to improve the performance and efficiency of the electrode by facilitating the flow of alternating current. Additionally, potassium can also enhance the adhesion of the coating to the electrode surface, ensuring better durability and longevity of the electrode in A.C. applications.Rate this question:
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- 18.
Fusible plugs melt as low as:
- A.
165°F
- B.
195°F
- C.
212°F
- D.
240°F
Correct Answer
A. 165°FExplanation
Fusible plugs are safety devices that are designed to melt at a specific temperature in order to release pressure or prevent an explosion. The given correct answer states that fusible plugs can melt as low as 165°F. This means that when the temperature reaches or exceeds 165°F, the plug will melt, allowing the pressure to be released and preventing any potential damage or danger.Rate this question:
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- 19.
When using direct current electrode negative with the S.M.A.W. process the type of penetration and weld width would be:
- A.
Deep and narrow
- B.
Deep and wide
- C.
Shallow and wide
- D.
Shallow and narrow
Correct Answer
A. Deep and narrowExplanation
Direct current electrode negative (DCEN) in Shielded Metal Arc Welding (SMAW) ensures deep penetration and a narrower weld bead. The electrode focuses heat, promoting efficient welding with increased depth and a more concentrated weld width.Rate this question:
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- 20.
Ohm's law is:
- A.
R = V x I
- B.
I = R x V
- C.
R = I/V
- D.
R = V/I
Correct Answer
D. R = V/IExplanation
Ohm's law states that the resistance (R) in a circuit is equal to the voltage (V) divided by the current (I). This means that the resistance is directly proportional to the voltage and inversely proportional to the current. In other words, as the voltage increases, the resistance also increases, and as the current increases, the resistance decreases. Therefore, the correct answer is R = V/I.Rate this question:
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- 21.
In G.T.A.W. electron flow is:
- A.
From positive to negative
- B.
From negative to positive
- C.
Alternates every half cycle
- D.
Travels constantly in the same direction
Correct Answer
B. From negative to positiveExplanation
In G.T.A.W. (Gas Tungsten Arc Welding), electron flow refers to the movement of electrons in the welding process. In this type of welding, the electrons flow from the negative terminal (cathode) to the positive terminal (anode). This flow of electrons allows for the creation of an electric arc that generates the heat necessary for welding. Therefore, the correct answer is "From negative to positive."Rate this question:
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- 22.
A capped steel is similar to:
- A.
Rimmed steel
- B.
Semi-killed steel
- C.
Killed steel
- D.
None of the above
Correct Answer
A. Rimmed steelExplanation
A capped steel is similar to rimmed steel because both types of steel have a high oxygen content. In the production process, a capped steel is partially deoxidized, resulting in the formation of a cap of iron oxide on the surface. Similarly, rimmed steel also has a high oxygen content but is fully deoxidized, forming a rim of iron oxide on the surface. Both types of steel are characterized by their ability to be easily shaped and formed, making them suitable for certain applications in the manufacturing industry.Rate this question:
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- 23.
In Canada, most welding machines are connected to a high voltage supply of:
- A.
575 volts
- B.
480 volts
- C.
240 volts
- D.
120 volts
Correct Answer
A. 575 voltsExplanation
In Canada, most welding machines are connected to a high voltage supply of 575 volts. This higher voltage is required to provide the necessary power for welding operations, as welding typically requires a significant amount of energy to heat and melt metals. The higher voltage allows for a more efficient and effective welding process, ensuring that the machine has enough power to generate the heat needed for welding.Rate this question:
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- 24.
The proportion of parent metal melted into the weld is known as:
- A.
Buttering
- B.
Tranfser
- C.
Dilution
- D.
Solidification rate
Correct Answer
C. DilutionExplanation
Dilution refers to the proportion of parent metal that is melted into the weld. When welding, the parent metal and the filler metal are melted together to create the weld. The amount of parent metal that mixes with the filler metal determines the level of dilution. This is an important factor to consider as it can affect the properties of the weld, such as its strength and corrosion resistance. Therefore, dilution is a key parameter in welding processes.Rate this question:
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- 25.
A method by which gases, principally hydrogen and oxygen, are removed by exposing the molten metal to a low pressure is known as:
- A.
Vacuum pressurizing
- B.
Vacuum gassing
- C.
Vacuum depressurizing
- D.
Vacuum degassing
Correct Answer
D. Vacuum degassingExplanation
Vacuum degassing is a method used to remove gases, mainly hydrogen and oxygen, from molten metal by exposing it to low pressure. This process helps to improve the quality and properties of the metal by reducing the amount of gas trapped within it. By creating a vacuum environment, the gases are forced to escape from the molten metal, resulting in a purer and more reliable final product.Rate this question:
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- 26.
A shunt generator is:
- A.
Separately excited
- B.
Self-excited
- C.
Nonexcitable
- D.
Brushless
Correct Answer
B. Self-excitedExplanation
A shunt generator is a type of DC generator that is self-excited, meaning it generates its own magnetic field without the need for an external source of excitation. In a shunt generator, the field winding is connected in parallel with the armature winding, hence the name "shunt." This configuration allows for a portion of the armature current to flow through the field winding, creating the necessary magnetic field for the generator to produce electricity. Therefore, a shunt generator is self-excited and does not require an external excitation source.Rate this question:
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- 27.
The electrode coating containing titanium dioxide is:
- A.
Cellulose
- B.
Rutile
- C.
Potassium
- D.
Iron powder
Correct Answer
B. RutileExplanation
The correct answer is Rutile because rutile is a form of titanium dioxide that is commonly used as an electrode coating. It is known for its high stability and excellent electrical conductivity, making it an ideal choice for electrode materials. Rutile coatings can provide protection against corrosion and improve the overall performance of electrodes in various applications, such as in batteries, solar cells, and electrochemical processes.Rate this question:
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- 28.
When the current reaches a certain level the magnetic field will tend to overload and further increases in current will not increase the field. This is known as:
- A.
Induction
- B.
Saturation
- C.
Resistance
- D.
Impedance
Correct Answer
B. SaturationExplanation
Saturation refers to the point at which the magnetic field cannot increase any further, even with an increase in current. This occurs when the magnetic material is fully magnetized and all its magnetic domains are aligned. At saturation, any additional increase in current will not result in a stronger magnetic field.Rate this question:
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- 29.
The ductility measured through the thickness of the plate is usually:
- A.
The highest of all
- B.
The lowest of all
- C.
The same as in any direction
- D.
About 80% of longitudinal direction
Correct Answer
B. The lowest of allExplanation
The correct answer is "The lowest of all." Ductility refers to the ability of a material to deform under tensile stress without breaking. When measuring ductility through the thickness of a plate, it is typically lower compared to other directions. This is because the grains in the material tend to align in the rolling direction during the manufacturing process, resulting in reduced ductility perpendicular to the rolling direction. Therefore, the ductility measured through the thickness of the plate is usually the lowest among all directions.Rate this question:
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- 30.
If a hard microstructure is formed in the H.A.Z. what is the only remaining factor that can be controlled to prevent cracking:
- A.
Amount of oxygen
- B.
Amount of hydrogen
- C.
Amount of carbon
- D.
Amount of phosphorus
Correct Answer
B. Amount of hydrogenExplanation
In the heat-affected zone (H.A.Z.), the formation of a hard microstructure can lead to cracking. The only remaining factor that can be controlled to prevent cracking is the amount of hydrogen. Excessive hydrogen can cause hydrogen embrittlement, which weakens the material and makes it more prone to cracking. By controlling the amount of hydrogen, the risk of cracking can be reduced in the H.A.Z.Rate this question:
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- 31.
The power source used for G.T.A.W. is:
- A.
Constant potential
- B.
Constant arc voltage
- C.
Constant voltage
- D.
Constant current
Correct Answer
D. Constant currentExplanation
The power source used for G.T.A.W. (Gas Tungsten Arc Welding) is constant current. In this welding process, a constant current power source is used to maintain a stable and consistent welding arc. Constant current ensures that the welding current remains the same regardless of changes in the arc length or other variables. This is important for achieving precise and controlled welds, especially when working with materials such as stainless steel or aluminum.Rate this question:
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- 32.
The average cable size for 150 feet of combined length of electrode and ground cables using 200 amps at 60% duty cycle would be:
- A.
3
- B.
2
- C.
1
- D.
1/10
Correct Answer
B. 2Explanation
The average cable size for 150 feet of combined length of electrode and ground cables using 200 amps at 60% duty cycle would be 2. This means that the cables should have a size of 2, which indicates a larger diameter to handle the higher amperage and prevent overheating.Rate this question:
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- 33.
Iron exists in the body-centered cubic (b.b.c.) at temperatures below:
- A.
625°C (1150°F)
- B.
723°C (1333°F)
- C.
910°C (1670°F)
- D.
955°C (1750°F)
Correct Answer
C. 910°C (1670°F)Explanation
Iron exists in the body-centered cubic (b.b.c.) structure at temperatures below 910°C (1670°F). This means that at temperatures below 910°C, the iron atoms arrange themselves in a specific pattern known as body-centered cubic, where each iron atom is surrounded by eight neighboring atoms. However, at temperatures above 910°C, the iron undergoes a phase transition and changes its crystal structure to face-centered cubic. Therefore, the correct answer is 910°C (1670°F).Rate this question:
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- 34.
Which of the following electrodes has a rutile and iron coating:
- A.
E-6012
- B.
E-7014
- C.
E-6013
- D.
E-7027
Correct Answer
B. E-7014Explanation
The electrode E-7014 has a rutile and iron coating.Rate this question:
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- 35.
The welding process which involves the use of a concentrated beam of light to generate the heat for metal fusion is:
- A.
Electron beam welding
- B.
Laser welding
- C.
Resistance welding
- D.
Thermit welding
Correct Answer
B. Laser weldingExplanation
Laser welding is the correct answer because it involves the use of a concentrated beam of light to generate the heat for metal fusion. In this process, a laser beam is directed onto the workpiece, melting and joining the metal together. Laser welding offers precise control, high welding speeds, and minimal distortion, making it suitable for various applications in industries such as automotive, aerospace, and electronics.Rate this question:
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- 36.
The power source and current type used most often with G.M.A.W. is:
- A.
C.P. with D.C.E.P.
- B.
C.C. with D.C.E.N.
- C.
C.A.V. with D.C.E.N.
- D.
C.V. with A.C.H.F.
Correct Answer
A. C.P. with D.C.E.P.Explanation
The correct answer is C.P. with D.C.E.P. This means that the power source used most often with G.M.A.W. is Constant Potential (C.P.) and the current type is Direct Current Electrode Positive (D.C.E.P.). G.M.A.W., or Gas Metal Arc Welding, requires a constant potential power source to maintain a stable arc and control the welding process. D.C.E.P. is used because it provides better penetration and allows for better control of the weld pool.Rate this question:
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- 37.
What is added to the electrode coating to increase the deposition rate:
- A.
Iron oxide
- B.
Fluorspar
- C.
Ferroalloys
- D.
Iron powder
Correct Answer
D. Iron powderExplanation
Iron powder is added to the electrode coating to increase the deposition rate. Iron powder has a high deposition efficiency and can improve the welding speed. It acts as a filler material that melts and fuses with the base metal, creating a strong bond. The addition of iron powder increases the amount of metal being deposited, resulting in a faster deposition rate during welding.Rate this question:
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- 38.
Which of the following electrodes is generally referred to as mineral coated with iron oxide:
- A.
E-7028
- B.
E-7015
- C.
E-7020
- D.
E-7010
Correct Answer
C. E-7020Explanation
E-7020 electrode is generally referred to as mineral coated with iron oxide. The mineral coating in this electrode helps in providing excellent arc stability and high deposition rates. It also offers good resistance to cracking and provides a smooth and clean weld appearance. This electrode is commonly used for welding structural steels and is suitable for both vertical and overhead welding positions.Rate this question:
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- 39.
Up to what percent carbon is completely dissolved in the face-centered cubic (F.C.C.):
- A.
0.5%
- B.
0.8%
- C.
1.2%
- D.
1.7%
Correct Answer
D. 1.7%Explanation
In a face-centered cubic (F.C.C.) structure, carbon atoms can dissolve in the lattice of a metal. The question asks about the maximum percentage of carbon that can be completely dissolved in this structure. The correct answer is 1.7%. This means that up to 1.7% of the total atoms in the F.C.C. lattice can be carbon atoms, beyond which the lattice will not be able to accommodate any more carbon atoms.Rate this question:
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- 40.
What type of cracking may be caused by excessive welding speeds:
- A.
Cold cracking
- B.
Lamellar tearing
- C.
Hydrogen cracking
- D.
Solidification cracking along the centre line
Correct Answer
D. Solidification cracking along the centre lineExplanation
Excessive welding speeds can cause solidification cracking along the center line. This type of cracking occurs due to the rapid cooling of the weld metal, which leads to the formation of cracks along the center line of the weld. The high welding speeds prevent proper fusion and solidification of the weld metal, resulting in the formation of these cracks. It is important to maintain appropriate welding speeds to prevent solidification cracking and ensure the integrity of the weld joint.Rate this question:
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- 41.
Face piece respirators with mechanical filters will be effective in:
- A.
Removing all fumes and gases in the air
- B.
Making up any deficiency in oxygen in the air
- C.
Removing all types of harmful gases
- D.
Reducing the exposure to particulates in the air
Correct Answer
D. Reducing the exposure to particulates in the airExplanation
Face piece respirators with mechanical filters are designed to reduce the exposure to particulates in the air. These filters are capable of capturing and trapping solid particles, such as dust, smoke, and other fine particles, preventing them from being inhaled by the wearer. However, mechanical filters are not effective in removing fumes, gases, or replenishing oxygen levels in the air. Therefore, the correct answer is reducing the exposure to particulates in the air.Rate this question:
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- 42.
Covered electrodes for S.M.A.W. are covered under what C.S.A. standard:
- A.
W48.1
- B.
W48.4
- C.
W48.5
- D.
W48.6
Correct Answer
A. W48.1Explanation
The correct answer is W48.1 because it is the CSA standard that covers the use of covered electrodes for Shielded Metal Arc Welding (S.M.A.W). The CSA standard W48.1 provides guidelines and specifications for the classification, testing, and use of covered electrodes in welding applications.Rate this question:
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- 43.
Which of the following is not a basic weld:
- A.
Groove
- B.
Fillet
- C.
Butt
- D.
Plug
Correct Answer
D. PlugExplanation
"Groove," "Fillet," and "Butt" are all basic types of welds commonly used in various welding applications. However, "Plug" welding refers to a specific type of weld used to fill holes or cavities in metal parts, typically not classified as one of the basic weld types.Rate this question:
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- 44.
A specified groove angle has a tolerance of:
- A.
-10°, +5°
- B.
+20°, -15°
- C.
+10°, -5°
- D.
-20°, +15°
Correct Answer
C. +10°, -5°Explanation
The specified groove angle has a tolerance of +10°, -5°. This means that the actual groove angle can be 10° greater or 5° less than the specified angle and still be considered within tolerance. For example, if the specified angle is 50°, the actual angle can be anywhere between 45° and 60° and still be acceptable.Rate this question:
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- 45.
One of the following is considered to be one of the basic weld types:
- A.
Edge weld
- B.
Butt weld
- C.
Lap weld
- D.
Corner weld
Correct Answer
B. Butt weldExplanation
A butt weld is a basic type of weld used to join two pieces of metal along their edges in a single plane. In a butt weld, the two pieces of metal are aligned parallel to each other and joined together by melting the edges and adding filler material if needed. This type of weld creates a strong, continuous joint between the two pieces of metal, often used in structural applications where strength and integrity are essential.Rate this question:
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- 46.
The curve of the output voltage vs. current under steady conditions is known as:
- A.
Dynamic characteristic
- B.
Arc characteristic
- C.
Static characteristic
- D.
Machine characteristic
Correct Answer
C. Static characteristicExplanation
The curve of the output voltage vs. current under steady conditions is known as the static characteristic. This curve represents the relationship between the output voltage and current when the system is in a stable state. It provides information about the behavior and performance of the system under normal operating conditions. By analyzing the static characteristic, engineers can determine the linearity, stability, and efficiency of the system.Rate this question:
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- 47.
In a T-joint, which preparation cannot be used:
- A.
J-groove
- B.
U-groove
- C.
Square groove
- D.
Bevel groove
Correct Answer
B. U-grooveExplanation
The U-groove preparation cannot be used in a T-joint. This is because the U-groove is typically used for butt joints, where two pieces of metal are joined in a straight line. In a T-joint, one piece of metal is joined perpendicularly to another, so the U-groove preparation is not suitable for this type of joint.Rate this question:
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- 48.
An insufficient root opening could cause:
- A.
Incomplete penetration
- B.
Porosity
- C.
Excessive weld reinforcement
- D.
Additional distortion
Correct Answer
A. Incomplete penetrationExplanation
Insufficient root opening in welding can lead to incomplete penetration, where the weld metal does not fully penetrate the joint. This can result in a weak and inadequate weld, compromising the structural integrity of the welded components. It is crucial to maintain proper root opening to ensure complete penetration and a sound weld joint.Rate this question:
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- 49.
The voltage range for short circuit transfer is:
- A.
16-22
- B.
24-28
- C.
28-40
- D.
32-50
Correct Answer
A. 16-22Explanation
The voltage range for short circuit transfer is 16-22. Short circuit transfer is a type of welding transfer mode where the wire electrode continuously touches the weld puddle, causing a short circuit. In this transfer mode, the voltage should be low to prevent excessive heat and spatter. The range of 16-22 volts is considered ideal for short circuit transfer as it provides good control over the welding process and produces a smooth and stable arc. Higher voltages may result in a globular transfer mode, while lower voltages may cause the electrode to stick to the workpiece.Rate this question:
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- 50.
The electrode with the highest percentage of iron powder in the coating would be:
- A.
E-XX024
- B.
E-XX048
- C.
E-XX014
- D.
E-XX018
Correct Answer
A. E-XX024Explanation
The electrode with the highest percentage of iron powder in the coating would be E-XX024. This can be inferred from the fact that E-XX024 is listed first in the options, indicating that it is the most likely answer. However, without additional information about the composition of the coatings or any other context, it is difficult to provide a more specific explanation.Rate this question:
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Aug 24, 2024Quiz Edited by
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Apr 22, 2019Quiz Created by
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Critical Thought Unveiled: Quiz on The Frankfurt School of Critical Theory
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