MT III Question 4
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1.
The acceptance criteria for magnetic particle testing of an ASME pressure vessel weld are specified in:
2.
Ferromagnetic materials are characterized by:
3.
Inclusions are most likely to give magnetic particle indications when they:
4.
The continuous method generally provides higher sensitivity than the residual method because:
5.
Stringers in wrought steel are:
6.
The maximum theoretical field of a magnetized part occurs at the:
7.
To obtain reliability and reproducibility with stationary wet-bath units, the most important control is:
8.
Which statement about the coil (cable-wrap) technique is correct?
9.
Above the Curie temperature, a ferromagnetic material:
10.
The primary reason for using water rather than oil as a particle suspension vehicle is that water:
11.
A 'tail shot' or extended contact may be needed when a part is too long to magnetize in a single:
12.
The magnitude of the residual field retained in a part depends mainly on the:
13.
Alternating current magnetization at line frequency is most effective for detecting:
14.
For structural steel welds, magnetic particle acceptance criteria are commonly specified by:
15.
Three common causes of nonrelevant indications are:
16.
The settling (concentration) test should be performed:
17.
The quick-break feature is most beneficial for establishing a longitudinal field in:
18.
Acceptable residual field after demagnetization is commonly verified with a:
19.
Transverse cracks in the heat-affected zone (HAZ) of a weld, located along the toe, are frequently associated with:
20.
A bath whose particle concentration is too low will tend to produce:
21.
For longitudinal magnetization in a coil, the formula NI = 45000/(L/D) applies for parts within an L/D range of about:
22.
Two yoke shots at 90 degrees to each other are used to:
23.
Dry magnetic powder should be applied as:
24.
When current is passed through a central conductor inside a hollow part, the field at the inside surface of the part is:
25.
Magnetic particle testing relies on the principle that a discontinuity creates a:
26.
Undercut at a weld toe is:
27.
The 1000 A per 25 mm (1 in.) of diameter rule of thumb is normally applied to:
28.
How many turns are needed to establish a longitudinal field in a steel shaft 229 mm (9 in.) long and 75 mm (3 in.) in diameter, with 3000 A available, using NI = 45000 / (L/D)?
29.
Magnetic particle examination is classified among NDT methods as a ____ method.
30.
Magnetic particle indications from subsurface discontinuities are generally detectable only to a depth of about:
31.
Which factor does NOT contribute to the effectiveness of magnetic particle inspection in finding discontinuities?
32.
The magnetizing force (field strength) is commonly expressed in:
33.
AC demagnetization is effective mainly near the surface because AC:
34.
Per SNT-TC-1A, an NDT Level III may be certified by:
35.
When evaluating the size of a subsurface discontinuity by MT, the indication generally appears:
36.
Which statement is true in connection with an antifoaming agent in a magnetic particle bath?
37.
A graph of flux density (B) versus magnetizing force (H) for a ferromagnetic material is called the:
38.
To minimize variation in UV-A output, the lamp should be:
39.
Which of the following is a ferromagnetic material suitable for MT?
40.
Heat treatment such as annealing is used primarily to:
41.
The minimum UV-A irradiance at the examination surface required by ASTM E1444/E709 is:
42.
MT Level II/III technicians should be aware that magnetizing operations may affect individuals with:
43.
A 'hard' magnetic material (e.g., for permanent magnets) has:
44.
A 'lifting power' (weight lift) check is the standard performance check for a:
45.
The output of an ultraviolet lamp should be checked with:
46.
Nonrelevant indications due to permeability change can be caused by:
47.
When two perpendicular circular fields are applied simultaneously in a vector technique, the result is:
48.
A desirable property of magnetic particles used for inspection is:
49.
Dark adaptation of the eye involves increased retinal sensitivity and:
50.
An NDT procedure for MT should, as a minimum, specify the:
51.
Fluorescent magnetic particles typically contain organic pigments and binding resins that tend to be:
52.
The most appropriate method to detect a tightly closed surface fatigue crack in a steel shaft is:
53.
An estimate of the direction and adequacy of the magnetic field is NOT obtained from a:
54.
If a yoke is used, the inspection is most reliable when the line between the legs is:
55.
The prod magnetizing current is generally specified as:
56.
Discontinuities produced during manufacturing operations such as forging, machining, or welding are classified as:
57.
Low-brightness magnetic particles are often colored ____ and high-brightness particles are colored ____.
58.
A seam in bar or wrought product is a discontinuity that is:
59.
Grinding cracks typically appear as:
60.
Postcleaning after MT is performed to:
61.
Direct current penetrates deeper than alternating current, making DC preferable for detecting:
62.
Under ASTM E1444, the visible (white) light intensity meter and UV intensity are checked at maximum intervals of:
63.
Prods used for magnetization apply current to the part by means of:
64.
A 'continuous' technique using AC is especially good for:
65.
Which is NOT an advantage of mobile magnetic particle power units?
66.
Yokes are most often specified by their:
67.
To inspect the inside diameter (bore) of a tube, the preferred method is:
68.
Demagnetization is generally easier when the part has:
69.
A continuous straight indication along the centerline of a restrained weld bead is most likely:
70.
Excessive part surface temperature for dry powder inspection is limited because high heat can:
71.
Cold working of a metal generally:
72.
To inspect for discontinuities at the root of a threaded hole, the most suitable approach is:
73.
When artificial lighting aids inspection, high-powered spotlights should generally NOT be used because they:
74.
A material that exhibits better compressive strength than tensile strength is typically:
75.
The two general categories of magnetic particles are:
76.
Wet magnetic particles are generally preferred for:
77.
Ultraviolet radiation intensity should be measured with a meter calibrated to the requirements of the manufacturer (traceable standards), correct to within about:
78.
The human eye is most sensitive (photopic) to light of wavelength near:
79.
A nonrelevant indication is one that:
80.
In ASME Section V Article 7, the technique using a yoke is verified for adequacy by its:
81.
The recommended sequence for a typical MT examination is:
82.
Ultraviolet radiation lies in the portion of the electromagnetic spectrum:
83.
A bath whose particle concentration is too high will tend to produce:
84.
When metal is forged at too low a temperature, an internal rupture known as a ____ may occur.
85.
Fatigue cracks are classified as which type of discontinuity?
86.
The residual magnetic field in a specimen does NOT depend on the:
87.
The 1000 A per 25 mm (1 in.) rule should be used with caution because the resulting magnetizing force may:
88.
The primary U.S. standard practice for magnetic particle examination referenced by ASNT is:
89.
A DC (permanent magnet or electromagnetic DC) yoke should have a lifting power of at least:
90.
Excessive inhalation of chlorinated hydrocarbon vapors during vapor degreasing can: