Cwb Level 2 Theory Quiz #1
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Questions and Answers
- 1.
Which of the following information would not normally be found on a WHMIS label:
- A.
Hazardous ingredients
- B.
Risk phrases
- C.
Product identifier
- D.
WHMIS Hazard symbol
Correct Answer
A. Hazardous ingredientsExplanation
The WHMIS label is a standardized label used in Canada to provide information about hazardous materials. It typically includes the product identifier, WHMIS hazard symbol, and risk phrases to indicate the potential hazards of the product. However, the hazardous ingredients are not normally found on the WHMIS label. This information is usually provided in the Safety Data Sheet (SDS) for the product, which is separate from the label. The SDS provides more detailed information about the composition of the product, including hazardous ingredients.Rate this question:
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- 2.
WHMIS information is conveyed by what method:
- A.
Product labels
- B.
M.S.D.S
- C.
Training
- D.
All of the above
Correct Answer
D. 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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- 3.
Creating a safe working environment is the responsibility of:
- A.
Employer
- B.
Employee
- C.
Middle arrangement
- D.
A and B are correct
- E.
A and C are correct
Correct Answer
D. 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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- 4.
The most hazardous voltages from welding power sources come from:
- A.
Secondary side
- B.
Primary side
- C.
Both sides
- D.
None of the above
Correct Answer
B. 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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- 5.
The cable from the workpiece back to the welding machine is correctly called:
- A.
Ground lead
- B.
Work lead
- C.
Electrode lead
- D.
Terminal lead
Correct Answer
B. Work leadExplanation
The cable from the workpiece back to the welding machine is called the work lead. This lead is responsible for carrying the electrical current from the welding machine to the workpiece, completing the circuit necessary for welding. The work lead is typically connected to the workpiece using a clamp or other attachment method to ensure a secure connection.Rate this question:
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- 6.
The open-circuit voltage of most welding machines is:
- A.
40
- B.
60
- C.
80
- D.
100
Correct Answer
C. 80Explanation
The open-circuit voltage of most welding machines is 80. Open-circuit voltage refers to the voltage measured across the output terminals of a welding machine when no load is connected. It represents the maximum voltage that the machine can deliver without any load. In this case, the correct answer indicates that the open-circuit voltage of most welding machines is 80 volts.Rate this question:
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- 7.
If a workmate suffers an electric shock; what is the first thing to do:
- A.
Do not try and pull the victim from a live contact
- B.
Turn off the power
- C.
Call for help
- D.
Keep the victim horizontal and warm
Correct Answer
B. 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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- 8.
Which of the following is not a non-ionizing radiation:
- A.
Visible rays
- B.
Ultraviolet rays
- C.
X-rays
- D.
Infrared rays
Correct Answer
C. X-raysExplanation
X-rays are not a non-ionizing radiation. Non-ionizing radiation refers to electromagnetic radiation that does not have enough energy to remove tightly bound electrons from atoms or molecules, resulting in minimal biological damage. X-rays, on the other hand, are a form of ionizing radiation that have higher energy and can cause ionization, leading to potential harm to living tissues and cells.Rate this question:
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- 9.
The suggested lense shade number when using the S.M.A.W. process: 1/8" electrode at 125 amps is:
- A.
8
- B.
10
- C.
12
- D.
14
Correct Answer
B. 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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- 10.
Roughly how far could spatter travel when welding or cutting on a structure about 5m high:
- A.
No more than 1m
- B.
Up to 20m
- C.
Up to 6m
- D.
Possibly up to 8m
Correct Answer
A. No more than 1mExplanation
When welding or cutting on a structure about 5m high, spatter refers to the small molten metal particles that are produced during the process. These particles can be propelled away from the welding or cutting area due to the intense heat and force involved. The given correct answer suggests that the spatter is not likely to travel more than 1m away from the area. This means that the majority of the spatter is expected to fall within a close proximity to the welding or cutting site, minimizing the risk of it causing damage or injury at a significant distance.Rate this question:
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- 11.
The greatest contributor to welding fume is:
- A.
Electrode and flux coating
- B.
Base plate
- C.
Base plate coating
- D.
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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- 12.
A very toxic component found in Copper is:
- A.
Ozone
- B.
Beryllium
- C.
Zinc
- D.
Tin
Correct Answer
B. BerylliumExplanation
Beryllium is a highly toxic component found in copper. It is a chemical element with atomic number 4 and is known for its extreme toxicity. Exposure to beryllium can cause serious health effects, including lung damage and cancer. It is commonly found in copper alloys, as it improves the strength and conductivity of the metal. Therefore, beryllium is the correct answer in this case.Rate this question:
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- 13.
As a rough guide, the amount of air exchange (ventilation) measured in cubic feet per hour per welder is:
- A.
1000
- B.
2000
- C.
3000
- D.
4000
Correct Answer
B. 2000Explanation
The correct answer is 2000 because this is the recommended amount of air exchange (ventilation) measured in cubic feet per hour per welder. This level of ventilation helps to ensure that there is enough fresh air circulating in the welding area to remove any harmful fumes or gases produced during the welding process. It is important to have proper ventilation in order to protect the welder's health and safety.Rate this question:
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- 14.
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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- 15.
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
The worker is exposed to a noise level of 98 dBA because the noise levels from the two machines would add up. Since each machine produces a noise level of 95 dBA, the total noise level the worker is exposed to would be the sum of these two levels, which is 190 dBA.Rate this question:
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- 16.
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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- 17.
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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- 18.
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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- 19.
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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- 20.
Which of the following is not a basic weld:
- A.
Groove
- B.
Fillet
- C.
Butt
- D.
Plug
Correct Answer
C. ButtExplanation
A butt weld is a type of weld where two pieces of metal are joined by aligning them edge to edge and then welding along the seam. It is a basic type of weld commonly used in various industries. The other options listed - groove, fillet, and plug - are all types of basic welds as well. Therefore, the correct answer is "Butt" because it is not a basic weld.Rate this question:
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- 21.
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
A. Edge weldExplanation
An edge weld is considered to be one of the basic weld types. In an edge weld, the two pieces of metal are joined along their edges. This type of weld is commonly used when two pieces of metal need to be joined together in a straight line. It provides a strong and durable connection between the two pieces of metal.Rate this question:
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- 22.
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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- 23.
The minimum distance from the root of the weld to its face, less any reinforcement is:
- A.
Actual throat
- B.
Theoretical throat
- C.
Effective throat
- D.
Leg size
Correct Answer
C. Effective throatExplanation
The effective throat refers to the minimum distance from the root of the weld to its face, less any reinforcement. It represents the actual area of the weld that is contributing to the strength and stability of the joint. Theoretical throat refers to the maximum possible distance, while leg size refers to the length of the weld. Therefore, the effective throat is the correct answer as it accurately represents the minimum distance without any additional reinforcement.Rate this question:
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- 24.
Which of the following is not a basic joint:
- A.
Groove
- B.
Butt
- C.
Lap
- D.
Edge
Correct Answer
A. GrooveExplanation
A groove joint is not considered a basic joint because it involves creating a groove or channel on one of the workpieces to fit the other workpiece into it. In contrast, basic joints like butt joints, lap joints, and edge joints involve connecting two pieces of material without the need for any additional grooves or channels.Rate this question:
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- 25.
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
B. Root faceExplanation
The term "root face" refers to the portion of the joint to be welded where the members are closest to each other. This means that it is the surface or edge that is exposed and accessible for welding. The root face is important because it affects the quality and strength of the weld. It is crucial to properly prepare and clean the root face before welding to ensure a strong and durable joint.Rate this question:
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- 26.
In a butt joint with the plates vertical and axis of the weld horizontal, the test position would be designated:
- A.
4G
- B.
3G
- C.
2G
- D.
1G
Correct Answer
C. 2GExplanation
In a butt joint with the plates vertical and axis of the weld horizontal, the test position would be designated as 2G. This is because the "G" in the designation refers to the position of the weld, with "G" representing a groove weld. The number in front of the "G" indicates the position of the joint, with 2 indicating a vertical position. Therefore, 2G is the correct designation for this specific test position.Rate this question:
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- 27.
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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- 28.
An isometric drawing has its width, length, and depth laid off on inclined lines usually ____° to the horizontal.
- A.
15
- B.
30
- C.
45
- D.
60
Correct Answer
B. 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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- 29.
The type of view used to show the exact shape of one part which may otherwise be difficult to determine is:
- A.
Pictorial view
- B.
Right side view
- C.
Auxiliary view
- D.
Bottom view
Correct Answer
C. Auxiliary viewExplanation
An auxiliary view is a type of view used to show the exact shape of a part that may be difficult to determine from the standard orthographic views. It is created by projecting the part onto a plane that is perpendicular to the line of sight and intersects the part at an angle. This allows for a more detailed and accurate representation of the part's shape, especially when there are complex features or irregular surfaces that cannot be fully shown in the standard views.Rate this question:
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- 30.
What number of dimensions are required to evaluate a fillet weld size:
- A.
One
- B.
Two
- C.
Three
- D.
Four
Correct Answer
C. ThreeExplanation
To evaluate a fillet weld size, three dimensions are required. These dimensions include the leg length, throat thickness, and the angle of the fillet weld. The leg length refers to the distance from the root to the toe of the weld, while the throat thickness is the shortest distance between the face and the root of the weld. The angle of the fillet weld is the angle formed between the two surfaces being joined. These three dimensions are crucial in determining the strength and quality of the fillet weld.Rate this question:
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- 31.
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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- 32.
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
C. Shallow and wideExplanation
When using direct current electrode negative with the S.M.A.W. process, the type of penetration and weld width would be shallow and wide. This is because electrode negative polarity results in shallow penetration but a wider weld width.Rate this question:
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- 33.
A constant-current power source has what type of volt-amp curve:
- A.
Vertical
- B.
Relatively flat
- C.
Horizontal
- D.
Drooping
Correct Answer
D. 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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- 34.
A typical melting rate for electrodes is:
- A.
1/2 lb. per min. per 1000 amps
- B.
1 lb. per min. per 1000 amps
- C.
1/2 lb. per min. per 100 amps
- D.
1 lb. per min. per 100 amps
Correct Answer
A. 1/2 lb. per min. per 1000 ampsExplanation
The correct answer is 1/2 lb. per min. per 1000 amps. This means that for every 1000 amps of current, the electrode will melt at a rate of 1/2 lb. per minute. This indicates that the higher the current, the faster the electrode will melt.Rate this question:
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- 35.
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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- 36.
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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- 37.
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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- 38.
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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- 39.
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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- 40.
The transition point from globular to spray transfer generally occurs at:
- A.
120 amps
- B.
180 amps
- C.
220 amps
- D.
260 amps
Correct Answer
C. 220 ampsExplanation
The transition point from globular to spray transfer generally occurs at 220 amps. At this current level, the metal transfer shifts from large droplets (globular) to a fine spray of small droplets (spray transfer). This transition is important in welding as it affects the quality and appearance of the weld.Rate this question:
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- 41.
The most common gas used with gas shielded flux cored welding is:
- A.
Argon
- B.
Helium
- C.
Hydrogen/Argon
- D.
Carbon Dioxide
Correct Answer
D. Carbon DioxideExplanation
Carbon dioxide is the most common gas used with gas shielded flux cored welding. This is because carbon dioxide provides good penetration and produces a stable arc, which is essential for achieving high-quality welds. Additionally, carbon dioxide is readily available and more cost-effective compared to other gases such as argon or helium. Therefore, it is the preferred choice for many welding applications.Rate this question:
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- 42.
If higher deposition rates were a concern when using the S.A.W. process, what current trait would be most suitable:
- A.
D.C.E.P.
- B.
D.C.E.N.
- C.
A.C.H.F.
- D.
A.C.
Correct Answer
B. D.C.E.N.Explanation
If higher deposition rates were a concern when using the S.A.W. (Submerged Arc Welding) process, the most suitable current trait would be D.C.E.N. (Direct Current Electrode Negative). In this process, the electrode is connected to the positive terminal of the power source, resulting in a concentrated heat at the electrode and a higher deposition rate. This current trait allows for faster melting of the electrode and a higher rate of metal transfer, which leads to increased deposition rates.Rate this question:
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- 43.
The reaction from which the required heat and molten metal is obtained when thermit welding is called:
- A.
Endothermic
- B.
Interthermic
- C.
Exothermic
- D.
Duothermic
Correct Answer
C. ExothermicExplanation
The correct answer is "Exothermic." Exothermic reactions release heat and energy. In thermit welding, a mixture of aluminum powder and metal oxide is ignited, producing a highly exothermic reaction that generates intense heat and molten metal. This heat is used to weld or join metal parts together.Rate this question:
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- 44.
A typical current range for a 5/32 in. (4mm) E-7018 (E 48018) is:
- A.
80-120 amps
- B.
100-150 amps
- C.
150-220 amps
- D.
200-300 amps
Correct Answer
C. 150-220 ampsExplanation
A typical current range for a 5/32 in. (4mm) E-7018 electrode is 150-220 amps. This range is suitable for welding applications using this specific electrode size and type. Using a current within this range ensures proper penetration and fusion of the weld joint, resulting in a strong and durable weld.Rate this question:
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- 45.
The welding process in which heat and pressure are used to obtain coalescence of the contacting surfaces is known as:
- A.
Friction welding
- B.
Explosion welding
- C.
Thermit welding
- D.
Diffusion welding
Correct Answer
D. Diffusion weldingExplanation
Diffusion welding is a welding process that involves the use of heat and pressure to achieve coalescence of the contacting surfaces. In this process, the metal surfaces are heated to a high temperature, causing atoms to diffuse across the interface and bond together. The application of pressure helps to ensure a strong and durable joint. Unlike other welding processes, diffusion welding does not require the use of filler material, making it a cost-effective option for joining similar or dissimilar metals.Rate this question:
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- 46.
The stud welding process calls for:
- A.
High currents for short time periods
- B.
Low current for short time periods
- C.
High currents for long time periods
- D.
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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- 47.
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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- 48.
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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- 49.
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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- 50.
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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