MT Level III Questions.doc

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MT Level III Questions.doc
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  1. The magnetic domains in a permanent magnet are aligned in:
    A. fixed positions with directions that cancel out
    B. a random position and may become aligned to attract a magnetic material
    C. the same direction as the metal's grain structure
    D. fixed positions, predominantly in one direction
    D. fixed positions, predominantly in one direction
    (this multiple choice question has been scrambled)
  2. For which of the following would the wet fluorescent technique be preferred over the dry technique?
    A. when the parts are large and bulky
    B. when increased speed and sensitivity are desired
    C. when fluorescent lighting is used for inspection
    D. when the parts being inspected are to be field welded
    B. when increased speed and sensitivity are desired
    (this multiple choice question has been scrambled)
  3. Gas, misruns, cold laps, and sand inclusions are examples of defects resulting from which of the following processes?
    A. grinding
    B. castingsd. heat treatment
    C. forging
    B. castingsd. heat treatment
    (this multiple choice question has been scrambled)
  4. All of the following are valid reasons for the demagnetization of parts after magnetic particle testing excep that:
    A. residual magnetism wil affect the temperature gauges used in subsequent heat treatment
    B. residual magnetism may interfere with the removal of the magnetic particles uring the cleaning process following inspection
    C. residual magnetism may interfere with later machining operations by attracting chips to the part
    D. residual magnetism may interfere with later magnetic particle inspection of the part, particularly if a lower magnetizing current or a reverse field will be used
    A. residual magnetism wil affect the temperature gauges used in subsequent heat treatment
    (this multiple choice question has been scrambled)
  5. All of the following are valid reasons for the demagnetization of parts after mgnetic particle testing except that:
    A. if the part is to be radiographed after magnetic particle inspection, residual magnetism may interfere with the electromagnetic radiation spectrum
    B. residual magnetism may attract chips or small particles in service, causing galling or mechanical wear
    C. residual magnetism could interfere with the operation or accuracy of instruments placed on or near the part during serviced. residual magnetism can disturb the welding arc path on parts to be welded
    A. if the part is to be radiographed after magnetic particle inspection, residual magnetism may interfere with the electromagnetic radiation spectrum
    (this multiple choice question has been scrambled)
  6. Subjecting a part to a magnetic field tht is constantly reversing in polarity and gradually diminishing in strength accomplishes which of the following?
    A. the part becomes magnetized
    B. the part becomes demagnetized
    C. the stremgth of the retained magnetic field increasesd. deep-lying defects are located
    B. the part becomes demagnetized
    (this multiple choice question has been scrambled)
  7. The concentration of the solid contenet of a suspension of magnetic particles is measured by:
    A. soaking the solids in benzol
    B. measuring the pull on a magnet
    C. weighing the suspension
    D. permitting the solids to settle out of suspension
    D. permitting the solids to settle out of suspension
    (this multiple choice question has been scrambled)
  8. An important factor that must be considered when selecting a method of magnetization is:
    A. the permeability of the part
    B. the location of inspection station
    C. the alloy, shape, and condition of the part
    D. both b and c
    D. both b and c
    (this multiple choice question has been scrambled)
  9. An important factor that must be considered when selecting a method of magnetization is:
    A. both a and b
    B. the material's Curie point
    C. the type of magnetizing current
    D. the availability of handling equipment
    A. both a and b
    (this multiple choice question has been scrambled)
  10. What happens to a magnetic material when it reaches its Curie temperature?
    A. its becomes diamagnetic
    B. it becomes paramagnetic
    C. it becomes radioactive
    D. it becomes nonmagnetic
    D. it becomes nonmagnetic
    (this multiple choice question has been scrambled)
  11. A material that is repelled by magnetism is:
    a: diamagnetic
    b. ferromagnetic
    c. paramagneticd. overtly magnetic
    a: diamagnetic
  12. Materials weakly attracted by magnetic fields are:
    A. paramagnetic
    B. covertly magneticd. diamagnetic
    C. dual mnetic
    A. paramagnetic
    (this multiple choice question has been scrambled)
  13. Methods used to preserve powder patterns include:
    a. photographs
    b. transparent tape
    c. transparent lacquer
    d. all of the above
    d. all of the above
  14. Magnetic particle inspection methods are recognized as superior to liquid penetrant techniques when:
    A. surfaces are anodized
    B. both a and c
    C. corroded surfaces are inspected
    D. parts are painted
    B. both a and c
    (this multiple choice question has been scrambled)
  15. . What magnetic property does a paranmagnetic mterial possess?
    A. is slightly magnetic
    B. has a demonstrated lack of electron mobility
    C. is highly magnetic
    D. has no magnetic property at all
    A. is slightly magnetic
    (this multiple choice question has been scrambled)
  16. In what way can a magnetic field be reduced?
    a. reduce the current
    b. move the part further away from the coil
    c. move the coil further away from the part
    d. all of the above
    d. all of the above
  17. When the external magnetizing force has been removed, some of the magnetic domains remain preferentially oriented. The additional force required to reurn them to their original random orientation is commonly referred to as:
    A. applied field force
    B. residual field force
    C. DC electric current force
    D. coercive force
    D. coercive force
    (this multiple choice question has been scrambled)
  18. When a cylinder is being magnetized by central conductor, the field is most intense:
    A. at the inside surface of the cylinder
    B. halfway through the thickness of the cylinder wall
    C. at the ends of the cylinder
    D. at the outer surface of the cylinder
    A. at the inside surface of the cylinder
    (this multiple choice question has been scrambled)
  19. When is the magnetic field strongest in an object being inspected by the magnetic particle method?
    A. when the magnetic prticle powder is applied
    B. just after the magnetizing current is shut off
    C. while the magnetizing current is applied
    D. just prior to current reversal when using AC current
    C. while the magnetizing current is applied
    (this multiple choice question has been scrambled)
  20. Which of the demagnetization methods listed below is most effective?
    A. half-wave rectified AC
    B. full-wave rectified
    C. DC with reversing and step-down control
    D. variable voltage AC with step-down control
    C. DC with reversing and step-down control
    (this multiple choice question has been scrambled)
  21. When using the longitudinal magnetization method to inspect a bar 152mm (6in) long and 51mm (2in) in diameter with a 5-turn coil, which of the following amperage values should be used?
    A. 2,000 amp-turns
    B. 12,000 amp-turns
    C. 3,000 amps
    D. 1,200 amps
    C. 3,000 amps
    (this multiple choice question has been scrambled)
  22. To examine a part 127mm (in) long and 51mm (2in) in diameter using a 5-turn coil and head-stock magnetic particle machine, what amperage should be used for longitudinal magnetization?
    A. 1,800 amps
    B. 10,000 amp-turns
    C. 750 amps
    D. 1,800 amp-turns
    A. 1,800 amps
    (this multiple choice question has been scrambled)
  23. To examine a bar 38cm (15in) long and 51mm (2in) in diameter using a 7-turn coil and head-stock magnetic particle machine, what amperage will be used for circular magnetization?
    A. 1,800 amp-turns
    B. 750 amps
    C. 49,000 amp-turns
    D. 1,800 amps
    D. 1,800 amps
    (this multiple choice question has been scrambled)
  24. If the same amperage is passed through a 25mm (1in) and a 51mm (2in) diameter bar of the same length, which of the following statements is most applicable relevant to the magnetic field at the surface of the bars?
    A. the strength of the magnetic field at the surface of the 51mm (2in) bar will be approximately four times that of the 25mm (1in) bar
    B. the strength of the magnetic field at the surface of the 25mm (1in) bar will be approximately twice that of the 51mm (2in) bar
    C. the strength of the magnetic field at the surface of the 25mm (1in) bar will be one-half that of the 51mm (2in) bar
    D. the strength of the magnetic field at the surfaces will be the same for both bars
    B. the strength of the magnetic field at the surface of the 25mm (1in) bar will be approximately twice that of the 51mm (2in) bar
    (this multiple choice question has been scrambled)
  25. If the same amperage is passed through a 25mm (1in) diameter bar and a 51mm (2in) diameter bar of the same length, which of the following statements is most applicable relevant to the magnetic field at the center of the bars?
    A. the strength of the magnetic field in the center of the 25mm (1in) bar will be one-half that of the 51mm (2in) bar
    B. the strength of the magnetic field in the center of the 25mm (1in) bar will be approximately one-fourth the value for the 2-inch bar
    C. the strength of the magnetic field in the center of both bars will be zero
    D. the strength of the magnetic field at the center of the 51mm (2in) bar will be one-half as that of the 25mm (1in) bar
    C. the strength of the magnetic field in the center of both bars will be zero
    (this multiple choice question has been scrambled)
  26. When a magnetic field is induced in a part with prods spaced 152mm (6in) apart, the field is a:
    A. residual field
    B. distorted circulr field
    C. solenoid field
    D. longitudinal field
    B. distorted circulr field
    (this multiple choice question has been scrambled)
  27. When circular magnetization is used and it is important to detect subsurface defects, direct current is used instead of alternating current because:
    A. the skin effect of AC reduces the maximum depth at which defects can be found
    B. DC saturates the magnetic particles better than AC
    C. particle mobility is no longer a factor
    D. there is no logical reason to use DC instead of AC
    A. the skin effect of AC reduces the maximum depth at which defects can be found
    (this multiple choice question has been scrambled)
  28. An inspection method in which a high magnetizing force is applied to a part, and the force is then reduced to a lower continuous value which is maintained during application of the inspection medium is called the:
    A. multivector method
    B. surge method
    C. residual method
    D. continuous method
    B. surge method
    (this multiple choice question has been scrambled)
  29. When deciding to inspect a part by the residual method, the strength of the residual field in the part should be considered. Factors that afffect this field include:
    a. the strength of the magnetizing force
    b. the retentivity of the test part
    c. the material alloy
    d. all of the above
    d. all of the above
  30. . Factors that must be considered when interpreting an indication are:
    a. the direction of the magnetic field
    b. the strength of the leakage field at the indication
    c. the orientation and shape of the indication
    d. all of the above
    d. all of the above
  31. When thorough demagnetization is to be accomplished by placing the part in a coil energized with AC of decreasing amperage, the following orientation of the long axis of the part is most advantageous:
    A. irrelevant (no difference)
    B. South-West
    C. North-South
    D. East-West
    D. East-West
    (this multiple choice question has been scrambled)
  32. A 7-turn coil at 1,000 amps is used to inspect a round solid part 38cm (15in) long and 64mm (2-1/2in) in diameter. What is the L/D ratio?
    A. 6
    B. 45,000 amp-turns
    C. 7,500 amp-turns
    D. 2.14
    A. 6
    (this multiple choice question has been scrambled)
  33. . Which of the following, when used as the last magnetizing method, will best render a part suitable for relatively easy measurement of the external magnetic field using a field indicator?
    A. longitudinal magnetization
    B. either a or b
    C. circular magnetization
    D. neither a or b
    A. longitudinal magnetization
    (this multiple choice question has been scrambled)
  34. . When using DC, an indication is detected. What is the next logical step to determine if the indication results from a surface or subsurface condition?
    A. reinspect at higher amperage
    B. reinspect using AC
    C. demagnetize and apply powder
    D. reinspect using the surge method
    B. reinspect using AC
    (this multiple choice question has been scrambled)
  35. Which of the statements made below is most appropriate concerning materials I and II represented by the hysteresis curves shown in Figure 1?
    A. material I could be used for dry powder magnetic particles
    B. material II is paramagnetic
    C. material II could be used for dry powder magnetic particles
    D. material I is not a good subject for magnetic particle inspection
    C. material II could be used for dry powder magnetic particles
    (this multiple choice question has been scrambled)
  36. The curve shown in Figure 1 for material II indicates that it:
    A. has a high coercive force
    B. would make an excellent permanent magnet
    C. has a high retentivity
    D. has a high permeability
    D. has a high permeability
    (this multiple choice question has been scrambled)
  37. Point B on the hysteresis curve for material I shown in Figure 1:
    A. is the material's magnetic saturation point
    B. represents the point at which the residual magnetic value will remain when the magnetizing current is removed
    C. represents the mid-point of the rectified AC current applied
    D. is the limit iof the coercive force
    A. is the material's magnetic saturation point
    (this multiple choice question has been scrambled)
  38. Which point on the hysteresis curve shown in Figure 1 represents the residual field value?
    A. A
    B. E
    C. D
    D. C
    D. C
    (this multiple choice question has been scrambled)
  39. When withdrawing a part from the field around a coil and without changing the direction of current, which of the following has the least effect on demagnetizing the part?
    A. full-wave rectified current
    B. alternating current
    C. half-wave rectified alternating current
    D. direct current
    D. direct current
    (this multiple choice question has been scrambled)
  40. An important factor that should be considered when selecting a method of magnetization is:
    a. field strength value
    b. available equipment
    c. configuration of the part
    d. all of the above
    d. all of the above
  41. Which of the following discontinuities occur as a result of the roling process?
    A. fissures
    B. laminations
    C. blowholes and pipe
    d. all of the above
    B. laminations
    (this multiple choice question has been scrambled)
  42. Which of the folowing discontinuities occur as a result of the forging process?
    A. laps
    B. pipe
    C. laminations
    d. all of the above
    A. laps
    (this multiple choice question has been scrambled)
  43. If an indication is formed when using the residual method as well as the continuous method, it is most likely:
    A. very deep and tight
    B. very shallow and open to the surface
    C. a nonrelevant indication
    D. a relevant indication
    D. a relevant indication
    (this multiple choice question has been scrambled)
  44. Plated parts can be reliably tested using the magnetic particle method if the plating is less than:
    A. 0.8mm (0.03in) thick
    B. 1mm (0.04in) thick
    C. 0.1mm (0.004in) thick
    D. 0.2mm (0.008in) thick
    C. 0.1mm (0.004in) thick
    (this multiple choice question has been scrambled)
  45. The magnetic lines of flux or flux in a permanent magnet:
    A. change direction 60 times a second with the magnetizing current
    B. in all cases produce a longitudinal field
    C. enter the south pole and leave the north pole
    D. flow from the north pole through the magnet to the south pole
    C. enter the south pole and leave the north pole
    (this multiple choice question has been scrambled)
  46. Which of the following magnetization techniques should be avoided when performing magnetic particle testing?
    A. vector magnetization
    B. parallel magnetization
    C. longitudinal magnetization
    D. circular magnetization
    B. parallel magnetization
    (this multiple choice question has been scrambled)
  47. Banding is a common term used to describe:
    A. field strength relative to the poles of a permanent magnet
    B. powder patterns created by using excess amperage
    C. the appearance of powder patterns at laminations found in heavy plate material
    D. a method of mounting cylindrical objects on a bench system
    B. powder patterns created by using excess amperage
    (this multiple choice question has been scrambled)
  48. When attempting to demagnetize a part containing a circular residual field:
    A. use half-wave current with a head shot setup and step-down magnetization to assure complete removal of the residual field
    B. establish a longitudianl field and then proceed with demagnetization
    C. consideration of the material's hysteresis is most important
    D. use a swinging cyclic field
    B. establish a longitudianl field and then proceed with demagnetization
    (this multiple choice question has been scrambled)
  49. The input current requirements for MT equipment depend in part upon the:
    A. duty cycle required
    B. prod spacing required on average production part types
    C. size of current cables
    D. shop electrical service
    A. duty cycle required
    (this multiple choice question has been scrambled)
  50. Small parts requiring demagnetization should be:
    A. processed through a demagnetization cycle one at a time
    B. loaded in a steel basket for better field distribution
    C. loaded in baskets and passed through an AC coil
    D. demagnetized after assembly to assure complete demagnetization of the entire assembly
    A. processed through a demagnetization cycle one at a time
    (this multiple choice question has been scrambled)
  51. The best shape for magnetic particles used in the dry powder method is:
    A. globular
    B. flat
    C. long and slender
    D. a mixture of b and c
    D. a mixture of b and c
    (this multiple choice question has been scrambled)
  52. 52. The best method for testing ball bearings is:

    a. along one axis using a coil
    b. two shots using a coil at the X and Y axis
    c: Two head shots along the X andY axis
    d. induced current shots along X, Y, and Z axis rotating 360 degrees during each shot
    d. induced current shots along X, Y, and Z axis rotating 360 degrees during each shot

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