MT Level 1 :: ASNT/NDT Mock Test Practice Quiz | MCQ’s Part-2

Non-Destructive Testing: 60′ Questions for Conduct of Examinations at NDT MT Levels-1

Magnetic Testing Level -1 (MT-1) General Examination Part-2

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MT Level 1 :: NDT Mock Test Practice Quiz MCQ’s Part-2

1.

A disadvantage of fluorescent magnetic particles is:

 
 
 
 

2.

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

 
 
 
 

3.

A material with a narrower hysteresis loop has:

 
 
 
 

4.

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

 
 
 
 

5.

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

 
 
 
 

6.

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?

 
 
 
 

7.

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

 
 
 
 

8.

Maximum practical prod spacing is about:

 
 
 
 

9.

The unit usually used to denote flux density is the:

 
 
 
 

10.

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

 
 
 
 

11.

The formula, NI = 45000/(L/D

 
 
 
 

12.

Which of the following produces a circular field?

 
 
 
 

13.

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

 
 
 
 

14.

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

 
 
 
 

15.

A material with a wider hysteresis loop has:

 
 
 
 

16.

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

 
 
 
 

17.

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

 
 
 
 

18.

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

 
 
 
 

19.

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

 
 
 
 

20.

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

 
 
 
 

21.

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

 
 
 
 

22.

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?

 
 
 
 

23.

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

 
 
 
 

24.

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

 
 
 
 

25.

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

 
 
 
 

26.

A residual circular field may be objectionable because:

 
 
 
 

27.

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

 
 
 
 

28.

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

 
 
 
 

29.

Which of the following will best define surface cracks?

 
 
 
 

30.

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

 
 
 
 

31.

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

 
 
 
 

32.

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

 
 
 
 

33.

Magnetic lines of flux that are parallel to discontinuity produce:

 
 
 
 

34.

The best available source of black light for inspection is:

 
 
 
 

35.

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

 
 
 
 

36.

Which of the following are ferromagnetic materials?

 
 
 
 

37.

Opposition to the establishment of a magnetic field is called:

 
 
 
 

38.

An advantage of AC equipment over DC is:

 
 
 
 

39.

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

 
 
 
 

40.

Why are magnetic particles available in different colours?

 
 
 
 

41.

The formula, NI = 45000/(L/D

 
 
 
 

42.

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:

 
 
 
 

43.

Which technique is the most sensitive?

 
 
 
 

44.

The temperature above which steels become nonmagnetic is called the:

 
 
 
 

45.

The magnetic field outside a conductor decreases:

 
 
 
 

46.

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

 
 
 
 

47.

An electric current through a copper wire:

 
 
 
 

48.

Fluorescent magnetic particle indications should be inspected under

 
 
 
 

49.

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

 
 
 
 

50.

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

 
 
 
 

51.

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

 
 
 
 

52.

The strongest magnetic field in a coil is at the:

 
 
 
 

53.

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

 
 
 
 

54.

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

 
 
 
 

55.

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

 
 
 
 

56.

Magnetic lines of force enter and leave a magnet at:

 
 
 
 

57.

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

 
 
 
 

58.

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

 
 
 
 

59.

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

 
 
 
 

60.

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

 
 
 
 

Question 1 of 60

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