Cwb Level 2 Theory Quiz #1
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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:
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120 feet
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12 inches
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12 feet
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120 inches
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About This Quiz
CWB Level 2 Theory Quiz #1 assesses knowledge on welding safety, including WHMIS labeling, safe working environments, and welding equipment handling. It evaluates understanding crucial for maintaining safety in welding operations, making it essential for professionals in the field.
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- 2.
The stud welding process calls for:
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High currents for short time periods
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Low current for short time periods
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High currents for long time periods
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Low current for long time periods
Correct Answer
A. High currents for short time periodsExplanation
The stud welding process requires high currents for short time periods because it is a fast and efficient method of joining a metal stud to a metal workpiece. High currents create intense heat, which quickly melts the stud and the workpiece, allowing them to fuse together. By using high currents for short time periods, the welding process can be completed rapidly, saving time and energy. This method also helps to minimize heat distortion and damage to the surrounding area.Rate this question:
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- 3.
Covered electrodes for S.M.A.W. are covered under what C.S.A. standard:
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W48.1
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W48.4
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W48.5
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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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- 4.
The greatest contributor to welding fume is:
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Electrode and flux coating
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Base plate
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Base plate coating
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Electrode slag
Correct Answer
A. Electrode and flux coatingExplanation
The greatest contributor to welding fume is the electrode and flux coating. During the welding process, the electrode and flux coating produce fumes that contain various hazardous substances such as metal oxides, ozone, and volatile organic compounds. These fumes are released into the air and can be harmful to the welder if inhaled. Therefore, proper ventilation and personal protective equipment are essential to minimize the exposure to these fumes and ensure a safe working environment.Rate this question:
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- 5.
What is the primary purpose of a welding procedure specification (WPS)?
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To outline the welder's qualifications
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To provide a detailed plan for producing a sound weld
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To specify the inspection methods for welded joints
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To record the results of weld inspections
Correct Answer
A. 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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- 6.
If the secondary coil has fewer turns in the primary coil, this is known as what type of transformer:
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Step-up
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Stationary
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Step-down
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Tap-type
Correct Answer
A. 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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- 7.
The line on which there will be neither tension or compression when a material is flexed or bent is termed:
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Neutral axis
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Circumferential access
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Linear access
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Longitudinal axis
Correct Answer
A. Neutral axisExplanation
The neutral axis is the line on which there will be neither tension nor compression when a material is flexed or bent. This means that the material experiences neither stretching nor squeezing along this axis. It is an important concept in structural engineering and mechanics, as it helps determine the distribution of stresses and strains in a flexed or bent material. The other options, circumferential axis, linear axis, and longitudinal axis, do not accurately describe the line with no tension or compression.Rate this question:
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- 8.
WHMIS information is conveyed by what method:
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Product labels
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M.S.D.S
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Training
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All of the above
Correct Answer
A. All of the aboveExplanation
The correct answer is "All of the above" because WHMIS information is conveyed through multiple methods. Product labels provide important information about the hazards and safety precautions associated with a product. Material Safety Data Sheets (M.S.D.S) provide detailed information about the composition, handling, and storage of hazardous substances. Training is another crucial method of conveying WHMIS information, ensuring that individuals are aware of the potential hazards and know how to handle and store hazardous materials safely. Therefore, all three methods play a significant role in conveying WHMIS information.Rate this question:
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- 9.
Creating a safe working environment is the responsibility of:
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Employer
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Employee
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Middle arrangement
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A and B are correct
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A and C are correct
Correct Answer
A. A and B are correctExplanation
The correct answer is A and B are correct. Both the employer and the employee have a shared responsibility in creating a safe working environment. The employer is responsible for implementing safety protocols, providing necessary training and equipment, and maintaining a hazard-free workplace. On the other hand, the employee is responsible for following safety guidelines, reporting any potential hazards, and actively participating in safety programs. By working together, both parties can ensure a safe and healthy work environment.Rate this question:
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- 10.
Face piece respirators with mechanical filters will be effective in:
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Removing all fumes and gases in the air
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Making up any deficiency in oxygen in the air
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Removing all types of harmful gases
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Reducing the exposure to particulates in the air
Correct Answer
A. 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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- 11.
The best form of distortion control when placing fillet welds on a long T-joint is:
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Rigid clamping
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Welding sequence
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Sub assembly
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Prebending or setting
Correct Answer
A. 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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- 12.
The mixture of a metal with other metals or nonmetals is known as an:
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Element
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Compound
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Crystal
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Alloy
Correct Answer
A. AlloyExplanation
An alloy is a mixture of a metal with other metals or nonmetals. It is formed by combining different elements to create a material with improved properties such as increased strength, durability, or resistance to corrosion. Alloys are commonly used in various industries, including automotive, aerospace, and construction, due to their desirable characteristics. Unlike elements, compounds, or crystals, which have specific chemical formulas and structures, alloys do not have a fixed composition and can vary in proportions depending on the desired properties.Rate this question:
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- 13.
The type of welding technique that results in a higher energy input is:
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Stringer leads with a small electrode
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Weave technique
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Whip technique
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Whip-string technique
Correct Answer
A. Weave techniqueExplanation
The weave technique in welding involves moving the electrode in a zigzag motion, creating a wider bead and covering a larger area. This technique requires more energy input as compared to other techniques, as it involves a larger surface area and more movement. This results in a higher energy input, making the weave technique the correct answer.Rate this question:
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- 14.
The proportion of parent metal melted into the weld is known as:
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Buttering
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Tranfser
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Dilution
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Solidification rate
Correct Answer
A. 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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- 15.
If a hard microstructure is formed in the H.A.Z. what is the only remaining factor that can be controlled to prevent cracking:
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Amount of oxygen
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Amount of hydrogen
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Amount of carbon
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Amount of phosphorus
Correct Answer
A. 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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- 16.
A condition where excess weld metal exists at the toe of a weld is termed:
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Undercut
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Overlap
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Excessive reinforcement
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Convexity
Correct Answer
A. OverlapExplanation
Overlap refers to a condition where excess weld metal exists at the toe of a weld. This occurs when the weld bead extends beyond the intended boundary, resulting in overlapping of the weld onto the base metal. Overlap can weaken the weld joint and compromise its integrity. It is important to avoid overlap by controlling the welding parameters and ensuring proper technique to achieve a sound and strong weld.Rate this question:
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- 17.
The magnitude of current flow is measured in:
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Ohms
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Volts
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Amps
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Watts
Correct Answer
A. 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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- 18.
If a workmate suffers an electric shock; what is the first thing to do:
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Do not try and pull the victim from a live contact
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Turn off the power
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Call for help
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Keep the victim horizontal and warm
Correct Answer
A. Turn off the powerExplanation
In the event that a workmate suffers an electric shock, the first thing to do is to turn off the power. This is crucial in order to ensure the safety of both the victim and anyone else in the vicinity. By cutting off the power source, the risk of further electric shocks is minimized, allowing for a safer environment to provide assistance to the victim. Once the power is turned off, other necessary steps such as calling for help and providing care can be taken.Rate this question:
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- 19.
The type of gas formed by the interaction of ultraviolet light, emitted from the arc, with the oxygen in the air is:
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Phosgene
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Carbon Monixide
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Ozone
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Carbon Dioxide
Correct Answer
A. 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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- 20.
How many principal views are there in an orthographic drawing:
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3
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4
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5
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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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- 21.
Generally speaking, what type of welding increases angular distortion:
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Multi-pass
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Single-pass
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Small first bead - large second bead
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Intermittent
Correct Answer
A. Multi-passExplanation
Multi-pass welding refers to a welding technique where multiple passes are made over the same joint to achieve the desired weld. This type of welding increases angular distortion because each pass introduces additional heat into the joint, causing the metal to expand and contract. As a result, the repeated heating and cooling cycles can lead to more significant angular distortion compared to single-pass welding, where only one pass is made. Additionally, the accumulation of weld metal from multiple passes can also contribute to increased distortion.Rate this question:
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- 22.
When considering joint design in a butt joint, groove weld and distortion could be a factor, the preferable preparation would be:
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Single V
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Single bevel
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Double V
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Square edge
Correct Answer
A. Double VExplanation
In a butt joint, groove weld and distortion can be factors to consider in joint design. The preferable preparation in this case would be a Double V. This type of preparation involves creating a V-shaped groove on both sides of the joint, allowing for better penetration and stronger weld. The Double V preparation also helps to distribute the heat evenly, reducing the chances of distortion in the welded joint.Rate this question:
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- 23.
A method by which gases, principally hydrogen and oxygen, are removed by exposing the molten metal to a low pressure is known as:
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Vacuum pressurizing
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Vacuum gassing
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Vacuum depressurizing
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Vacuum degassing
Correct Answer
A. 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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- 24.
Surface impurities of the parent metal would most likely cause what weld fault:
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Undercut
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Slag lines
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Porosity
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Concavity
Correct Answer
A. PorosityExplanation
Surface impurities of the parent metal can cause porosity in welds. Porosity refers to the presence of small holes or voids in the weld metal, which can weaken the weld and make it more prone to failure. Surface impurities such as dirt, oil, rust, or moisture can become trapped in the weld pool during the welding process, leading to the formation of gas pockets. These gas pockets then solidify, creating porosity in the weld. Therefore, the presence of surface impurities is most likely to cause porosity as a weld fault.Rate this question:
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- 25.
A constant-current power source has what type of volt-amp curve:
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Vertical
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Relatively flat
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Horizontal
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Drooping
Correct Answer
A. DroopingExplanation
A constant-current power source has a drooping volt-amp curve. This means that as the load resistance increases, the voltage decreases while the current remains constant. This type of curve is characteristic of power sources that are designed to deliver a constant current regardless of the load impedance.Rate this question:
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- 26.
If the current is a flow of electrons they move in what direction:
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From positive to negative
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From negative to positive
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They alternate each half cycle
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They flow on positive side of neutral line
Correct Answer
A. 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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- 27.
In the C.S.A. W48.5 M classification of flux cored filler wire the number 2 in E-4802T-6-CH designates:
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Tensile strength
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Slag system
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Position of welding
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Tubular wire
Correct Answer
A. Position of weldingExplanation
The number 2 in the E-4802T-6-CH designation of the flux cored filler wire indicates the position of welding. This classification system is used to identify various characteristics of the filler wire, and in this case, the number 2 specifically refers to the welding position.Rate this question:
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- 28.
What type of cracking may be caused by excessive welding speeds:
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Cold cracking
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Lamellar tearing
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Hydrogen cracking
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Solidification cracking along the centre line
Correct Answer
A. 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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- 29.
Which of the following fuel gases are lighter than air:
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Propane
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Butane
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Propylene
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Acetylene
Correct Answer
A. 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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- 30.
An insufficient root opening could cause:
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Incomplete penetration
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Porosity
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Excessive weld reinforcement
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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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- 31.
The suggested lense shade number when using the S.M.A.W. process: 1/8" electrode at 125 amps is:
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8
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10
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12
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14
Correct Answer
A. 10Explanation
The suggested lense shade number when using the S.M.A.W. process with a 1/8" electrode at 125 amps is 10. This shade number indicates the level of darkness needed to protect the welder's eyes from the intense light produced during the welding process. A shade number of 10 is appropriate for this specific welding setup, providing sufficient protection without being too dark to hinder visibility.Rate this question:
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- 32.
The welding process which involves the use of a concentrated beam of light to generate the heat for metal fusion is:
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Electron beam welding
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Laser welding
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Resistance welding
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Thermit welding
Correct Answer
A. 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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- 33.
Most metals are able to withstand an almost unlimited amount of:
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Compression
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Expansion
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Distortion
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Stretch
Correct Answer
A. CompressionExplanation
Metals have strong atomic bonds and a crystalline structure, which allows them to withstand high amounts of pressure or compression without breaking or deforming permanently. This is due to the ability of metal atoms to move and rearrange themselves under compression, allowing the material to absorb and distribute the applied force. Unlike other materials, metals have a high resistance to compression, making them suitable for applications where strength and durability are required. Therefore, the correct answer is compression.Rate this question:
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- 34.
From the following, select a ferrous material:
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Nickle
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Aluminum
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Stainless steel
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Magnesium
Correct Answer
A. Stainless steelExplanation
Stainless steel is a ferrous material because it contains iron as its main component. It is an alloy of iron, carbon, and other elements such as chromium and nickel. The presence of iron in stainless steel gives it magnetic properties and makes it susceptible to rust and corrosion. Stainless steel is widely used in various industries due to its strength, durability, and resistance to heat and chemicals.Rate this question:
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- 35.
A specified groove angle has a tolerance of:
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-10°, +5°
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+20°, -15°
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+10°, -5°
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-20°, +15°
Correct Answer
A. +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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- 36.
What is added to the electrode coating to increase the deposition rate:
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Iron oxide
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Fluorspar
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Ferroalloys
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Iron powder
Correct Answer
A. 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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- 37.
The type of condition created in alloy steels by stray arc flashes is:
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Quenched and brittle
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Normalized
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Quenched and tempered
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Spherodized
Correct Answer
A. Quenched and brittleExplanation
When alloy steels are exposed to stray arc flashes, they undergo a process called quenching. This rapid cooling causes the steel to become brittle and prone to fracture. Therefore, the correct answer is "Quenched and brittle."Rate this question:
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- 38.
In G.T.A.W. electron flow is:
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From positive to negative
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From negative to positive
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Alternates every half cycle
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Travels constantly in the same direction
Correct Answer
A. 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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- 39.
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:
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Induction
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Saturation
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Resistance
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Impedance
Correct Answer
A. 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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- 40.
The type of power source with a drooping volt-amp characteristic is:
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C.A.V.
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C.C.
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C.P.
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C.V.
Correct Answer
A. 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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- 41.
In °F the temperature for storing basic electrodes in an oven is:
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70-300
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75-200
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200-300
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100-150
Correct Answer
A. 200-300Explanation
The correct answer is 200-300. This temperature range is suitable for storing basic electrodes in an oven. Storing them at this temperature helps to maintain their quality and prevent any damage or degradation. Temperatures below 200 °F may not provide enough heat to keep the electrodes in optimal condition, while temperatures above 300 °F may cause them to overheat and lose their effectiveness. Therefore, the recommended temperature range for storing basic electrodes is 200-300 °F.Rate this question:
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- 42.
The spacing between two unrestrained loops of continuous wire used for welding is called:
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Pitch
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Cast
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Shape
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Helix
Correct Answer
A. HelixExplanation
The spacing between two unrestrained loops of continuous wire used for welding is called a helix. A helix refers to a three-dimensional curve with a constant slope or pitch. In the context of welding, the wire is often wound in a helical shape, creating a series of loops with a consistent spacing. This helical arrangement allows for a more efficient and controlled welding process, ensuring proper heat distribution and weld quality. The term "pitch" is also mentioned in the question, but it refers to the distance between two adjacent threads in a screw or bolt, not applicable to the given context.Rate this question:
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- 43.
The most hazardous voltages from welding power sources come from:
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Secondary side
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Primary side
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Both sides
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None of the above
Correct Answer
A. Primary sideExplanation
The correct answer is "Primary side." Welding power sources produce hazardous voltages, and the primary side refers to the input side of the power source where the electrical supply is connected. This side typically operates at higher voltages, making it more dangerous. The secondary side, on the other hand, refers to the output side where the welding current is generated and is generally at a lower voltage level. Therefore, the primary side poses a greater risk in terms of hazardous voltages.Rate this question:
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- 44.
The power source used for G.T.A.W. is:
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Constant potential
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Constant arc voltage
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Constant voltage
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Constant current
Correct Answer
A. 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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- 45.
In order to convert an alternating current to a direct current, it is necessary to use a:
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Rectifier
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Inductor
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Reactor
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Transformer
Correct Answer
A. RectifierExplanation
To convert an alternating current (AC) to a direct current (DC), a rectifier is required. A rectifier is an electrical device that converts AC to DC by allowing current to flow in only one direction. It typically consists of diodes that act as one-way valves for current, allowing the positive half of the AC waveform to pass while blocking the negative half. This process results in a unidirectional flow of current, effectively converting AC to DC. Therefore, a rectifier is necessary to convert AC to DC in electrical circuits.Rate this question:
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- 46.
Stress cracking is most likely to occur when welding thick material. This is due to:
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Undercutting and nicking
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Decreased cooling effect
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Hydrogen embrittlement
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Increased cooling effect
Correct Answer
A. 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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- 47.
An isometric drawing has its width, length, and depth laid off on inclined lines usually ____° to the horizontal.
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15
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30
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45
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60
Correct Answer
A. 30Explanation
An isometric drawing is a type of 3-dimensional drawing where the width, length, and depth are displayed on inclined lines. These inclined lines are usually drawn at an angle of 30 degrees to the horizontal. This angle allows for an accurate representation of the object's dimensions in a visually appealing manner.Rate this question:
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- 48.
Lightly coated electrodes have about what percentage of weight in the coating:
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10-20%
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20-35%
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35-50%
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Up to 55%
Correct Answer
A. 10-20%Explanation
Lightly coated electrodes have approximately 10-20% of their weight in the coating. This means that the coating on these electrodes makes up a relatively small percentage of the overall weight.Rate this question:
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- 49.
The electrode coating containing titanium dioxide is:
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Cellulose
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Rutile
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Potassium
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Iron powder
Correct Answer
A. 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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