Magnetism Fundamentals Quiz
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Questions and Answers

What are the most practical ways of creating magnetic fields in parts for portable use?

  • Coils, Yokes, Prods (correct)
  • Pipes, Valves, Fittings
  • Gears, Belts, Pulleys
  • Magnets, Wires, Springs

    • What are the general characteristics of magnetic particles used in magnetic testing?

  • Coarse non-magnetic materials, Rare earth metals, Limited types available
  • Liquid materials, Copper oxides, One type available
  • Finely divided ferromagnetic materials, Usually iron oxides, Numerous types available (correct)
  • Organic materials, Aluminum, Many types available

    • What is the effect of particle size on the ability of a weak magnetic field to attract and hold particles?

  • The larger the particles, the more sensitivity and mobility possible
  • Particle size does not affect sensitivity and mobility
  • Sensitivity and mobility are only affected by the shape of the particles
  • The smaller the particles, the more sensitivity and mobility possible (correct)

    • What is the purpose of larger particles in most dry powders for magnetic testing?

    <p>Aid in locating larger defects</p> Signup and view all the answers

    What must be selected for each application for optimum results in magnetic particle testing?

    <p>Proper type of magnetic particles</p> Signup and view all the answers

    What must DC yokes be capable of lifting for magnetic particle testing?

    <p>18.1 (40Ib)</p> Signup and view all the answers

    What are the means of producing a magnetic field mentioned in the text?

    <p>Coils, Yokes, Prods</p> Signup and view all the answers

    What are the general characteristics of magnetic particles used in magnetic testing?

    <p>Finely divided ferromagnetic materials, Usually iron oxides, Numerous types available</p> Signup and view all the answers

    What is the purpose of the MT - yoke method according to the text?

    <p>To qualify KION personnel for performance of MT - yoke method on in-house products</p> Signup and view all the answers

    What is the scope of the MT - yoke method?

    <p>To review the basic principles and applications of the MT - yoke method</p> Signup and view all the answers

    What is the definition of a magnet?

    <p>A material having the power to attract iron and other magnetic materials to itself, and that exhibit poles</p> Signup and view all the answers

    What is the definition of magnetic flux (lines of force)?

    <p>The lines of force that represent the flow of magnetism within a magnetic field</p> Signup and view all the answers

    What are the topics covered in the Fundamentals of MT — Yoke method?

    <p>Principles of magnetics, Magnetization using electric currents, Equipment, Selection of technique, Application of MT, Discontinuity detection</p> Signup and view all the answers

    What is the region around a magnet within which ferromagnetic materials are attracted called?

    <p>Magnetic field</p> Signup and view all the answers

    What is the ability of matter to attract other matter to itself called?

    <p>Magnetism</p> Signup and view all the answers

    What are the applicable documents for the Fundamentals of MT — Yoke method?

    <p>DIN EN ISO 17638, DIN EN ISO 9934 - Part 1, DIN EN ISO 9934 - Part 2, DIN EN ISO 9934 - Part 3</p> Signup and view all the answers

    What is the number of flux lines crossing a unit area at right angles to these lines defined as?

    <p>Magnetic field strength</p> Signup and view all the answers

    What does flux density, measured in Gauss, represent?

    <p>The number of flux lines per unit area</p> Signup and view all the answers

    Which material classifications are mentioned in the text?

    <p>Paramagnetic, ferromagnetic, and diamagnetic</p> Signup and view all the answers

    What are some key aspects of a material's reaction to a magnetizing force?

    <p>Hysteresis curve, permeability, reluctance, saturation, and coercive force</p> Signup and view all the answers

    What is the directional flow of magnetic field lines within a material?

    <p>From the south pole to the north pole</p> Signup and view all the answers

    What do magnetic fields around a bar magnet consist of?

    <p>Continuous, curved lines linking the north and south poles</p> Signup and view all the answers

    What influences magnetic attraction and flux leakage?

    <p>The presence of discontinuities and the orientation of flux lines</p> Signup and view all the answers

    What are some terms essential in understanding magnetism in materials?

    <p>Demagnetization, induction, residual magnetism, and retentivity</p> Signup and view all the answers

    What methods affect the orientation and detection of discontinuities in a component?

    <p>Longitudinal and circular magnetization methods</p> Signup and view all the answers

    What is the recommended magnetizing current for product magnetization?

    <p>100-125 amperes per inch of product spacing</p> Signup and view all the answers

    What should the spacing between products be limited to for effective magnetization?

    <p>Approximately 200mm</p> Signup and view all the answers

    How is the intensity of the magnetic field assessed in yoke magnetization?

    <p>By testing the lifting capacity of the yoke with the legs</p> Signup and view all the answers

    What must AC yokes be capable of lifting?

    <p>4</p> Signup and view all the answers

    What can affect the detectability of subsurface indications in magnetic particle testing?

    <p>Depth below surface, orientation, and powder buildup</p> Signup and view all the answers

    According to ASTM E709, how are nonrelevant and false indications defined?

    <p>Nonrelevant: Indications resulting from leakage fields; False: Indications not resulting from magnetic forces</p> Signup and view all the answers

    What is the definition of nonrelevant indications in magnetic particle testing?

    <p>Indications resulting from leakage fields</p> Signup and view all the answers

    In magnetic particle testing, what are false indications attributed to?

    <p>Shallow depressions or surface scale</p> Signup and view all the answers

    What factor makes interpretation more difficult for subsurface indications in magnetic particle testing?

    <p>All of the above</p> Signup and view all the answers

    What influences the detectability of subsurface indications in magnetic particle testing?

    <p>Depth below surface</p> Signup and view all the answers

    What makes the interpretation of subsurface indications in magnetic particle testing more difficult?

    <p>All of the above</p> Signup and view all the answers

    What are false indications in magnetic particle testing attributed to?

    <p>Shallow depressions or surface scale</p> Signup and view all the answers

    What type of black lights are recommended for magnetic testing?

    <p>Black lights with a wavelength of 3.6x10-4 mm and intensity not less than 800 µW/cm2</p> Signup and view all the answers

    Which current type is preferred for deeper penetration in magnetic testing?

    <p>Direct current</p> Signup and view all the answers

    What are dry particles more sensitive to in magnetic testing?

    <p>Subsurface defects</p> Signup and view all the answers

    What are the two sequences for applying magnetic particles during testing?

    <p>Residual method and continuous method</p> Signup and view all the answers

    What does the direction of the magnetic field depend on in magnetic testing?

    <p>Shape and orientation of the defect in relation to the part's principal axes</p> Signup and view all the answers

    What factors does sensitivity in magnetic testing depend on?

    <p>Particle type, magnetizing current, and sequence</p> Signup and view all the answers

    What does the equipment used for magnetic testing depend on?

    <p>Size, shape, and number of parts to be tested</p> Signup and view all the answers

    What is the recommended step for test surface preparation in magnetic testing?

    <p>Removing dirt, rust, loose scale, and oil or grease from the test area</p> Signup and view all the answers

    How should the magnetic field be verified before testing?

    <p>By using production or fabricated test parts with discontinuities or magnetic field indicators</p> Signup and view all the answers

    What are magnetic field indicators used for in magnetic testing?

    <p>To indicate field strength and direction at the surface in the area of the part under test</p> Signup and view all the answers

    What are the crucial steps in magnetic testing?

    <p>Effective area of coverage, overlap of effective areas, yoke placement for weld examination, and application of magnetic particles</p> Signup and view all the answers

    Study Notes

    Magnetism and Magnetic Field Fundamentals

    • Magnetic field lines in a bar magnet form closed loops from pole to pole without crossing, with decreased density as they move from higher to lower permeability areas

    • Directional flow of magnetic field lines occurs from the south pole to the north pole within a material and vice versa in air

    • Flux density, measured in Gauss, represents the number of flux lines per unit area and is denoted by "B" on the hysteresis curve

    • Material classifications include paramagnetic, ferromagnetic, and diamagnetic materials, each exhibiting different magnetic properties

    • Terms like demagnetization, induction, residual magnetism, and retentivity are essential in understanding magnetism in materials

    • Hysteresis curve, permeability, reluctance, saturation, and coercive force are key aspects of a material's reaction to a magnetizing force

    • Magnetic fields around a bar magnet are made up of continuous, curved lines linking the north and south poles

    • Magnetic poles, though not actually flowing, exhibit directional properties and create attraction or repulsion

    • Magnetic attraction and flux leakage are influenced by the presence of discontinuities and the orientation of flux lines

    • Longitudinal and circular magnetization methods affect the orientation and detection of discontinuities in a component

    • Different types of magnetizing currents, such as direct current, alternating current, and half-wave rectified single-phase AC, have varying penetration and particle mobility characteristics

    • Understanding the magnetizing methods and the orientation of magnetic fields is crucial for effective magnetic particle testing.Magnetization Methods for Non-Destructive Testing

    • For product magnetization, the recommended magnetizing current is 100-125 amperes per inch of product spacing.

    • The spacing between the products should be limited to approximately 200mm for effective magnetization.

    • In yoke magnetization, the intensity of the magnetic field is assessed by testing the lifting capacity of the yoke with the legs and the spacing to be used for the inspection.

    • For AC yokes, they must be capable of lifting 4.

    Magnetic Testing Training Material Summary

    • Black lights with a wavelength of 3.6x10-4 mm and intensity not less than 800 µW/cm2 are recommended for magnetic testing.
    • Techniques for magnetic testing include selection of current type, particles, method of application, sequence, direction of field, sensitivity level, and equipment.
    • Direct current is preferred for deeper penetration, while alternating current is more sensitive to surface defects.
    • Dry particles are more sensitive to subsurface defects, while wet particles are more sensitive to very fine surface defects.
    • Residual method and continuous method are two sequences for applying magnetic particles during testing.
    • The direction of the magnetic field is decided based on the shape and orientation of the defect in relation to the part's principal axes.
    • Sensitivity in magnetic testing depends on factors such as particle type, magnetizing current, and sequence.
    • The equipment used for magnetic testing depends on the size, shape, and number of parts to be tested.
    • Test surface preparation involves removing dirt, rust, loose scale, and oil or grease from the test area.
    • The magnetic field should be verified before testing by using production or fabricated test parts with discontinuities or magnetic field indicators.
    • Magnetic field indicators, like the "pie gage," are used to indicate field strength and direction at the surface in the area of the part under test.
    • The effective area of coverage, overlap of effective areas, yoke placement for weld examination, and application of magnetic particles are crucial steps in magnetic testing.

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    Description

    Test your knowledge of magnetism and magnetic field fundamentals with this quiz covering topics such as magnetic field lines, flux density, material classifications, hysteresis curve, magnetization methods, and non-destructive testing techniques. Ideal for those seeking to understand the principles behind magnetism and its applications in various fields.

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