MT III Question 1
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1.
Near-vision acuity for NDT personnel is generally required to read at least:
2.
To re-examine an area where nonrelevant indications obscure interpretation, the inspector should:
3.
In contact with water-based vehicles, electricity primarily presents a:
4.
A permanent-magnet yoke creates which type of field?
5.
Evaluation of indications smaller than about 1.5 mm (1/16 in.) is often:
6.
When inspecting a weld with a yoke, two examinations are made with the yoke legs oriented:
7.
A 'duty cycle' rating on MT equipment refers to the:
8.
The purpose of evaluation is to:
9.
A longitudinal field (coil) is best for detecting discontinuities that are:
10.
The stronger a discontinuity's ability to hold magnetic particles, generally the:
11.
Half-wave rectified current combined with dry powder is especially effective because it provides:
12.
Power cables operating at high temperature are prone to:
13.
Pipe (shrinkage cavity) in a wrought product originates from:
14.
The temperature range over which magnetic particles may be used is set by the:
15.
Shims (artificial flaw indicators) are applied to the part surface to:
16.
Vision under conditions of dark adaptation (rod-dominated) is known as:
17.
High-pressure / high-intensity UV lamp housings and filters during operation are:
18.
When magnetizing tubular parts by direct contact (through the wall), the inside surface field is:
19.
Soldering filler metal melts at temperatures:
20.
Magnetic flux lines that run parallel to a discontinuity produce:
21.
Per typical acceptance criteria, a 'linear indication' is one whose length is:
22.
The magnetism that remains in a ferromagnetic material after the magnetizing force has been removed is called:
23.
A heat-treated part can be demagnetized by heating it above its Curie temperature, but this is usually avoided because it:
24.
When using prods, the spacing between prod tips is typically kept between:
25.
Field adequacy can be established by all of the following EXCEPT:
26.
Before performing wet fluorescent magnetic particle testing, the part surfaces must be:
27.
The recommended amperage range per 25 mm (1 in.) of diameter for circular magnetization using a DC source is generally:
28.
Parts with an L/D ratio less than about 2 may need to be magnetized longitudinally by:
29.
A 'low fill factor' coil produces a field that, compared to a high fill factor, requires:
30.
A portable 220 V supply with a cable wrap provides 3000 ampere-turns. To provide the same ampere-turns, a prewound coil rated 120 V at 6 A would require:
31.
A circular magnetic field may be induced into a specimen by:
32.
Vision under normal levels of illumination (cone-dominated) is known as:
33.
A Hall-effect (gauss/tesla) meter is used to:
34.
The settling test for bath concentration uses a 100 mL pear-shaped centrifuge tube; the recommended settling volume for fluorescent particles is about:
35.
Quantitative Quality Indicators (QQIs / artificial flaw shims) are most useful for:
36.
Per SNT-TC-1A, the maximum recommended interval between recertifications for Level I and II is:
37.
A magnetic field meter (gaussmeter) with a Hall probe measures the:
38.
Tangential field strength at the surface for adequate MT is typically in the range of:
39.
Magnetic flux/field indicator shims should be placed:
40.
The reason for using alternating current for surface-crack detection is its:
41.
How many ampere-turns are required to longitudinally magnetize a part 406 mm (16 in.) long and 50 mm (2 in.) in diameter using NI = 45000 / (L/D)?
42.
The point on the magnetization curve beyond which an increase in magnetizing force produces little increase in flux density is called:
43.
The principal source of ultraviolet (UV-A) radiation used for fluorescent inspection is a:
44.
An indication in magnetic particle testing is defined as:
45.
The acceptance/rejection of an indication is determined by the:
46.
A contrast ratio readily perceived by the human eye in normal lighting is about:
47.
A teslameter (gaussmeter) is best described as a:
48.
A well-documented effect of overexposure of human skin to UV radiation is:
49.
From a reliability standpoint, small items are best demagnetized:
50.
The peak wavelength of the UV-A radiation used for fluorescent magnetic particle inspection is approximately:
51.
The residual method of magnetic particle testing can be used only on materials that have:
52.
A cold shut in a casting is:
53.
The minimum visible (white) light intensity required at the surface for examination with visible (color-contrast) particles is:
54.
Ultraviolet intensity meters used for MT should be calibrated against standards traceable to:
55.
Bronze is principally an alloy of:
56.
Which discontinuity is inherent to the casting process?
57.
Ferritic and martensitic stainless steels, unlike austenitic grades, are:
58.
Demagnetization with alternating current is most commonly accomplished by:
59.
The three basic levels of NDT certification recognized by SNT-TC-1A and CP-189 are:
60.
An electromagnetic (electrical) yoke produces:
61.
Discontinuities such as fatigue cracks, stress-corrosion cracks, and creep cracks are classified as:
62.
Aerosol cans of magnetic particle materials do not have an infinite shelf life mainly because:
63.
A specification is best defined as a document that:
64.
Materials with lower permeability (e.g., high-carbon tool steels) that are harder to magnetize are more subject to:
65.
Of the following, the technique most effective for detecting near-surface discontinuities is:
66.
The amount of magnetizing current for prods is based on:
67.
Which of the following materials CANNOT be inspected by the magnetic particle method?
68.
The most important operator-controlled factor for detecting a given discontinuity is correct field:
69.
An arc strike on a finished part is considered a discontinuity because it may:
70.
Per CP-189, the frequency of the visual (near and color) examination is typically:
71.
Per SNT-TC-1A and CP-189, the technical qualification of NDT personnel is documented by training, experience, and:
72.
The magnetic rubber method records discontinuities by:
73.
Which statement is true regarding magnetic lines of force?
74.
When using a central conductor offset against the bore wall, examination is performed:
75.
A discontinuity oriented at a small angle to the magnetic field will produce an indication that is:
76.
A field indicator (8-direction pie-type device) verifies field direction but does NOT:
77.
A limitation of magnetic particle testing compared with penetrant testing is that MT:
78.
Crater cracks are typically:
79.
When a fluorescent dye is excited by UV-A radiation it re-emits light that is:
80.
Carrier fluids for wet particles should have controlled odor, low viscosity, and:
81.
Forging laps are usually:
82.
Operating power for typical mobile magnetic particle power packs is:
83.
Lack of fusion in a weld is:
84.
Which particle-application technique provides greater sensitivity for locating subsurface (near-surface) discontinuities?
85.
A practical (hands-on) examination for MT certification requires the candidate to:
86.
Permeability is the ratio of:
87.
Magnetic flux density (induction) is measured in:
88.
Which eyewear is recommended for personnel performing fluorescent inspection under UV-A light?
89.
The maximum output current of a standard multidirectional (stationary) unit is on the order of:
90.
The purpose of interpretation in magnetic particle inspection is to: