VT II General
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1.
Visual testing (VT) is best defined as:
Examination of an object with the eye, alone or aided by optical instruments, to evaluate its surface condition
Detection of embedded flaws using light transmitted through the material
Measurement of internal residual stresses by light refraction
An examination that may only be performed after all other NDT methods are complete
2.
Visual testing is primarily limited to detecting discontinuities that are:
3.
The light-sensitive retinal cells responsible for colour vision and fine detail in bright light are the:
4.
The rods of the retina are primarily responsible for:
5.
The area of the retina that gives the sharpest visual acuity is the:
6.
The ability of the eye to change focus for objects at different distances is called:
7.
Under normal (photopic) lighting, the human eye is most sensitive to light of approximately:
8.
Illuminance at an examination surface is measured in:
10.
A small lamp produces 800 lx on a surface 1 m away. If the lamp is moved to 2 m, the illuminance will be about:
11.
Glare during visual examination is best reduced by:
12.
Reflection from a smooth, polished surface in which the angle of reflection equals the angle of incidence is called:
13.
Low-angle (oblique) lighting directed across a surface is most useful for:
14.
A Snellen acuity of 20/40 means the person:
15.
A Jaeger chart is used to test:
17.
Using the 10 in. reference distance, a simple magnifier with a focal length of 2.5 in. gives a magnification of about:
18.
As the magnification of a lens increases:
19.
In a flexible fiberscope, the image is carried by:
20.
Small black dots that appear in the image of an older fiberscope are usually caused by:
21.
Rigid borescopes generally give a sharper image than fiberscopes because they use:
22.
A videoscope differs from a fiberscope in that the videoscope:
23.
The main limitation of a rigid borescope is that it:
24.
A fillet weld gauge is primarily used to measure:
25.
A hi-lo gauge is primarily used to measure:
26.
A groove melted into the base metal next to the weld toe and left unfilled by weld metal is:
27.
Weld metal that protrudes beyond the weld toe without fusing to the base metal is:
28.
A weld face or root surface that lies below the adjacent surface of the base metal is:
29.
A cavity-type discontinuity formed by gas trapped during solidification is:
30.
A star-shaped crack at the end of a weld bead is called a:
31.
A small remelted or heat-affected spot on the base metal outside the weld, caused by accidental arc contact, is:
32.
Arc strikes are of concern mainly because they:
33.
A root surface on the inside of a pipe weld that is drawn up below the inner pipe surface is called:
34.
A planar discontinuity in rolled plate, seen as a line along a cut edge or weld bevel parallel to the plate surface, is a:
35.
A cold shut is a discontinuity associated with:
36.
In service, fatigue cracks most commonly start at:
37.
Pitting is a form of:
38.
Under SNT-TC-1A, the party responsible for certifying NDT personnel is the:
39.
Under SNT-TC-1A, a Level II individual should be qualified to:
Only perform examinations under written instructions from a Level I
Approve procedures and the employer's written practice
Set up and calibrate equipment and interpret and evaluate results against the applicable codes, standards and specifications
Designate the NDT method for a new application as final authority
40.
Under SNT-TC-1A, the general examination addresses: