1.

Why are magnetic particles available in different colours?

2.

The unit usually used to denote flux density is the:

3.

Which of the following are ferromagnetic materials?

4.

A material with a narrower hysteresis loop has:

5.

The magnetic field outside a conductor decreases:

6.

Which of the following types of magnetic fields may be present without any external evidence?

7.

For direct contact magnetizing methods, the current should be flowing in what direction relative to expected discontinuities?

8.

What rule describes the direction of current flow (+ to –

9.

Which of the following represents ultraviolet light of wavelengths which are potentially injurious (1 Å = 10-10m)

10.

Maximum practical prod spacing is about:

11.

The reverse magnetizing force necessary to remove a residual magnetic field from a test piece after it has been magnetically saturated is called:

12.

The opposition that a ferromagnetic material shows to the establishment of a magnetic field is called:

13.

The area of maximum induced field strength using a yoke is:

14.

Which technique is the most sensitive?

15.

Cracks that are caused by alternating stresses above a critical level are called:

16.

Why should one avoid using a high-velocity flow of wet testing media over the test area?

17.

The magnetism which remains in a piece of magnetizable material after the magnetizing force has been removed is called the:

18.

Why is it preferable to disassemble parts before magnetic particle inspection?

19.

The formula, NI = 45000/(L/D

20.

A magnetic field that is contained completely within the test piece is called a:

21.

The correct number of ampere-turns for a given test specimen is determined by:

22.

Cracks that are caused by a combination of tensile stress and corrosion are called:

23.

The formula, NI = 45000/(L/D

24.

The ability of a material to remain magnetic after the magnetizing force is removed is called:

25.

Which of the following would be likely to cause variations in the output of an inspection black light?

26.

A disadvantage of fluorescent magnetic particles is:

27.

What equipment is used to determine if a part has been demagnetized?

28.

The best available source of black light for inspection is:

29.

A residual circular field may be objectionable because:

30.

The strongest magnetic field in a coil is at the:

31.

A minimum of external poles are produced by what type of magnetization?

32.

Which of the following produces a circular field?

33.

A common physiological effect of black light inspection on the inspector is:

34.

A split-coil would most likely be used with a:

35.

A common physiological effect of black light inspection on the inspector is:

36.

Applying the theory of the ‘Right-Hand Rule’, a longitudinal surface defect in a round bar is detected by ‘current passing in a direction parallel to the direction of expected defects’ because:

37.

The ease with which a magnetic field can be established in a test piece is called:

38.

A material with a wider hysteresis loop has:

39.

A magnetic particle build-up from a discontinuity is strongest when the discontinuity is oriented:

40.

Most fluorescent dyes used for magnetic particle testing fluoresce what color?

41.

Fields generated in ferromagnetic material with AC current are useful for locating:

42.

The temperature above which steels become nonmagnetic is called the:

43.

An electric current through a copper wire:

44.

Magnetic lines of force enter and leave a magnet at:

45.

When the orientation of likely discontinuities is unknown, what is the minimum number of magnetizing operations required to perform an adequate test?

46.

Magnetic lines of flux that are parallel to discontinuity produce:

47.

A common rule of thumb to use for current required in circular magnetization:

48.

For direct contact magnetizing methods, the magnetic field is oriented in what direction relative to the current direction?

49.

The most common harmful effect of exposure to black light is:

50.

Opposition to the establishment of a magnetic field is called:

51.

Dyes that receive light at one wavelength and re-emit light of another wavelength are called:

52.

An advantage of AC equipment over DC is:

53.

What is the magnetic field strength at the surface of a 25mm diameter bar as compared to that at the surface of a 50mm diameter bar, each carrying 1000 amps of current?

54.

The most common source of DC current for magnetic particle testing is:

55.

The area of maximum induced field strength using a yoke is:

56.

What is the magnetic field strength at the surface of a 100 mm diameter bar as compared to that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current?

57.

Which of the following will best define surface cracks?

58.

Fluorescent magnetic particle indications should be inspected under

59.

The areas on a magnetized part from which the magnetic field is leaving or returning into the part are called:

60.

The temperature above which most soft steels become nonmagnetic is about: