Magnetic Particle Testing: Principles and Practice Quiz
Delve into the world of non-destructive testing with the "Magnetic Particle Testing: Principles and Practice Quiz." This quiz tests your knowledge and understanding of the principles, techniques, and applications of magnetic particle testing (MPT).
Magnetic particle testing is a crucial inspection method to detect surface and near-surface defects in ferromagnetic materials. In this quiz, you'll encounter questions covering MPT fundamentals, such as magnetization methods, particle selection, interpretation of indications, and safety precautions.
Take on the challenge of "Magnetic Particle Testing: Principles and Practice Quiz," compare your performance, and master the essential techniques needed to conduct adequate and accurate inspections through this knowledge-packed Read morequiz.
- 1.
Why are magnetic particles available in different colors?
- A.
For color contrast with the part surface.
- B.
To enhance the detection of indications
- C.
For both A and B
- D.
Different colors are used with different magnetic flux values.
Correct Answer
C. For both A and BExplanation
Magnetic particles are available in different colors for both A and B. The first reason is for color contrast with the part surface, which makes it easier to see the magnetic particles and any indications or defects on the surface. The second reason is to enhance the detection of indications, as different colors can provide better visibility and contrast depending on the type of part being inspected. Therefore, both reasons contribute to the availability of magnetic particles in different colors.Rate this question:
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- 2.
If one-inch and two-inch diameter bars were magnetized by passing the same current through them, the magnetic fields would be
- A.
The same for both.
- B.
Stronger in the two-inch diameter bar.
- C.
Weaker in the one-inch diameter bar
- D.
Stronger in the one-inch diameter bar.
Correct Answer
A. The same for both.Explanation
The magnetic field generated by a current-carrying wire is directly proportional to the current and inversely proportional to the distance from the wire. In this case, the current passing through both the one-inch and two-inch diameter bars is the same. Since the distance from the wire is also the same for both bars (assuming they are of the same length), the magnetic fields generated by them will be the same.Rate this question:
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- 3.
A prime consideration when selecting a powder to be used as a magnetic particle medium is to select a powder that
- A.
Provides a high contrast to the surface being tested.
- B.
Provides a low contrast to the surface being tested.
- C.
Will adhere to the surface being tested
- D.
Requires a high demagnetization current to remove it.
Correct Answer
A. Provides a high contrast to the surface being tested.Explanation
When selecting a powder to be used as a magnetic particle medium, it is important to choose a powder that provides a high contrast to the surface being tested. This is because a high contrast allows for better visibility and detection of any defects or cracks on the surface. A powder with low contrast would make it difficult to distinguish between the magnetic particles and the surface, leading to potential missed defects. Adherence to the surface being tested and the requirement of a high demagnetization current are not prime considerations when selecting the powder.Rate this question:
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- 4.
Which of the following will produce circular magnetism?
- A.
Passing current through a coil
- B.
Placing the test part in a solenoid
- C.
Passing current through prods
- D.
None of the above.
Correct Answer
C. Passing current through prodsExplanation
Passing current through prods can produce circular magnetism. When an electric current flows through a conductor, it creates a magnetic field around it. By passing current through prods, which are typically cylindrical conductors, a circular magnetic field can be generated. This circular magnetism can be useful in various applications such as electromagnets or magnetic stirrers.Rate this question:
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- 5.
What Historical Rule describes the direction of current flow (+ to -) when lines of magnetic force surround a conductor?
- A.
Left hand rule
- B.
Right hand rule
- C.
Flux rule
- D.
Reluctance rule
Correct Answer
B. Right hand ruleExplanation
The right hand rule is a rule used to determine the direction of current flow in a conductor when lines of magnetic force surround it. By pointing the thumb of the right hand in the direction of the current flow, the fingers will curl in the direction of the magnetic field. This rule is commonly used in physics and electrical engineering to understand the relationship between magnetic fields and current flow in conductors.Rate this question:
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- 6.
An electric current through a copper wire
- A.
Creates a magnetic field around the wire.
- B.
Creates a longitudinal magnetic field in the wire.
- C.
Magnetizes the wire.
- D.
Does not create a magnetic field.
Correct Answer
A. Creates a magnetic field around the wire.Explanation
When an electric current flows through a copper wire, it creates a magnetic field around the wire. This is due to the interaction between the moving charges (electrons) in the wire and the magnetic field they produce. This phenomenon is known as electromagnetism and is the basis for many electrical devices such as motors and transformers. The magnetic field created by the current can be detected using a compass needle or by placing a small magnetic material near the wire.Rate this question:
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- 7.
The size of most dry powder magnetic particles used in general flaw detection is
- A.
Less than 2 microns in any dimensiomn
- B.
About 3000 to 4000 microns
- C.
A mixture of shapes and sizes
- D.
Not a consideration in the test method
Correct Answer
C. A mixture of shapes and sizesExplanation
The correct answer is a mixture of shapes and sizes. In general flaw detection, dry powder magnetic particles are used. These particles are typically a mixture of various shapes and sizes. This mixture allows for better coverage and detection of flaws in the material being tested. By having different sizes and shapes, the particles can adhere to different types of defects and provide a more accurate indication of any flaws present.Rate this question:
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- 8.
What is the minimum intensity of black light required for magnetic particle inspections using fluorescent particles? At what distance?
- A.
1000 W/cm? @ 38cm (15")
- B.
1000 lux/cm? @ 38cm (15")
- C.
1000 ft.cdls/cm? @ 38cm (15")
- D.
1000 Mw/cm? @ 38cm (15")
Correct Answer
A. 1000 W/cm? @ 38cm (15")Explanation
The minimum intensity of black light required for magnetic particle inspections using fluorescent particles is 1000 W/cm? at a distance of 38cm (15").Rate this question:
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- 9.
What is the minimum intensity of white light required for critical inspections using visible magnetic particle inspection methods? ( Provide answers in lux or foot-candles)
- A.
1000 µW/cm? @ 38cm (15")
- B.
1000 lux/cm² @ 38cm (15")
- C.
1000 ft.cdls/cm² @ 38cm (15")
- D.
1000 Mw/cm² @ 38cm (15")
Correct Answer
B. 1000 lux/cm² @ 38cm (15")Explanation
The minimum intensity of white light required for critical inspections using visible magnetic particle inspection methods is 1000 lux/cm² @ 38cm (15").Rate this question:
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- 10.
The minimum acceptable particle concentration for wet fluorescent magnetic particle inspection is
- A.
1.2 ml to 2.4 ml per 100 ml of vehicle
- B.
0.1 ml to 0.4 ml per 100 ml of vehicle
- C.
Both A and B are acceptable
- D.
Neither A or B are acceptable
Correct Answer
B. 0.1 ml to 0.4 ml per 100 ml of vehicleExplanation
The correct answer is 0.1 ml to 0.4 ml per 100 ml of vehicle. This concentration range is considered acceptable for wet fluorescent magnetic particle inspection. It ensures that there is a sufficient concentration of particles in the vehicle to effectively detect any defects or cracks in the material being inspected. Concentrations below this range may result in inadequate particle coverage and reduced sensitivity, while concentrations above this range may lead to excessive background fluorescence and decreased contrast, making it more difficult to identify defects.Rate this question:
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- 11.
The acceptable concentration limit for wet visible magnetic particle inspection is
- A.
1.2 ml to 2.4 ml per 100 ml of vehicle
- B.
0.1 ml to 0.4 ml per 100 ml of vehicle
- C.
Both A and B are acceptable
- D.
Neither A or B are acceptable
Correct Answer
C. Both A and B are acceptableExplanation
The acceptable concentration limit for wet visible magnetic particle inspection ranges from 1.2 ml to 2.4 ml per 100 ml of vehicle or from 0.1 ml to 0.4 ml per 100 ml of vehicle. These limits ensure effective particle suspension and proper inspection without compromising quality or safety standards.Rate this question:
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- 12.
What type of test is used to measure the performance of an AC yoke?
- A.
Lifting test. The AC yoke must lift at least 4.5 kg (10 lbs).
- B.
Lifting test. The AC yoke must lift at least 18 kg (40 lbs).
- C.
Lifting test. Using AC, yoke must lift at least 9 kg (20 lbs).
- D.
Lifting test. Using DC, yoke must lift at least 4.5 kg (10 lbs).
Correct Answer
A. Lifting test. The AC yoke must lift at least 4.5 kg (10 lbs).Explanation
The correct answer is "Lifting test. The AC yoke must lift at least 4.5 kg (10 lbs)." This answer states that the performance of an AC yoke is measured through a lifting test, where the yoke must be able to lift a minimum weight of 4.5 kg (10 lbs).Rate this question:
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- 13.
What is the test used to measure the performance of a DC yoke?
- A.
Lifting test. The DC yoke must lift at least 4.5 kg (10 lbs) b Lifting test.
- B.
Lifting test. The DC yoke must lift at least 18 kg (40 lbs).
- C.
Lifting test. The DC yoke must lift at least 9 kg (20 Ibs).
- D.
Lifting test. The AC yoke must lift at least 4.5 kg (10 lbs).
Correct Answer
B. Lifting test. The DC yoke must lift at least 18 kg (40 lbs).Explanation
The correct answer is "Lifting test. The DC yoke must lift at least 18 kg (40 lbs)." This means that the performance of a DC yoke is measured by its ability to lift a weight of at least 18 kg or 40 lbs. This test ensures that the DC yoke is strong enough and capable of handling heavy loads.Rate this question:
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- 14.
The name of the container used to measure the concentration of the bath used in the wet method is
- A.
Centrifuge tube
- B.
Beaker
- C.
Graduated cylinder
- D.
Test tube
Correct Answer
A. Centrifuge tubeExplanation
A centrifuge tube is a type of container that is commonly used in laboratory settings to separate and concentrate substances through the process of centrifugation. While it is not typically used to measure the concentration of a bath in the wet method, it is possible that in certain circumstances, a centrifuge tube may be used for this purpose. However, it is important to note that other containers such as beakers, graduated cylinders, and test tubes are more commonly used for measuring the concentration of solutions in the wet method.Rate this question:
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- 15.
When doing the settling test, what should you do if clumping of the particles occurs?
- A.
Replace the particles
- B.
Replace the vehicle
- C.
Demagnetize the bath
- D.
Demagnetize the suspension in the tube
Correct Answer
D. Demagnetize the suspension in the tubeExplanation
When clumping of the particles occurs during the settling test, it indicates that there may be magnetic forces at play. Demagnetizing the suspension in the tube helps to eliminate these magnetic forces, allowing the particles to settle properly. This ensures accurate and reliable results in the settling test.Rate this question:
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Current Version
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Mar 08, 2024Quiz Edited by
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Aug 01, 2023Quiz Created by
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