Chapter 12: Nondestructive Examination Processes Flashcards
Which of the following NDE methods do not usually require electricity?
Eddy current, visible dye penetrant, visual
Visible dye penetrant, visual
Which of the following NDE methods is limited to the detection of surface discontinuities?
Visual, penetrant, magnetic particle
All 3
To be most effective, visual inspection should be performed:
Before, during, and after welding
The time during which the penetrant remains on the surface of the part to allow it to be drawn into any discontinuities is called:
Dwell time
Which type of magnetizing current provides the best combination of penetrability and particle mobility?
Half-wave rectified DC
What NDE method will most likely reveal subsurface porosity?
RT
A correct following statement regarding RT and density:
A high-density discontinuity will produce a light image on the film
Which of the following discontinuities is rarely detected using RT?
Lamination
What device is used during radiography to indicate the acquired sensitivity of a radiograph?
Penetrameter (Image Quality Indicator)
Which nondestructive examination method utilizes sound energy as a probing medium?
UT
The process whereby the ultrasonic indications are related to physical distances in a test standard is referred to as:
Calibration
A test probé containing an alternating current coil is used for which NDE method?
ET
Changes in electrical conductivity can be measured using which NDE method?
ET
Which of the following NDE methods are suitable for detecting surface cracks?
Any
What NDE method is most likely to reveal internal laminations in a rolled plate?
UT
PT is limited to the detection of those discontinuities that are:
Clean and open to the test object surface
Visible Dye penetrant indications:
Must be observed under white light
Penetrant can be applied by:
Brushing, spraying, dipping
Fluorescent penetrants are generally more sensitive than visible dye penetrants because:
Fluorescent indications are better seen by the human eye
Which of the following cause decreased sensitivity in PT?
Too heavy application of the developer, oily or greasy test object, improper penetrant removal
All above
PT is limited to test objects that:
Are nonporous
MT will discover:
Surface discontinuities and slightly subsurface discontinuities
MT is most sensitive to those discontinuities that are:
Perpendicular to the lines of flux
MT is limited to test objects that:
Are ferromagnetic
UT is most sensitive to those discontinuities that are:
Perpendicular to the sound waves
UT uses frequencies:
Above range of human hearing
In UT the horizontal axis of the CRT screen gives information about:
The distance the sound has traveled in the part
RT shows areas of lower density as:
Dark regions on the film
RT shows areas of less thickness as:
Dark Regions
RT shows areas of increased transmission as:
Dark regions on the film
Tungsten inclusions generally appear in RT as:
Light regions
Cracks generally appear in RT as:
Dark lines on the film
Weld reinforcement generally appears as
Light regions on the film
Porosity generally appears in RT as:
Dark Regions
Shallow surface cracks can best be detected in type 308 stainless steel by:
PT
Underbead cracks can best be detected by:
UT
Porosity in ESW Can best be detected by:
RT
The vertical axis of the UT CRT screen represents m:
Reflector size
What NDE methods rely on the transmission of sound energy through the test object?
UT and AET
What NDE methods often rely on the application of a hydrostatic pressure vessel?
Pressure tests, leak tests, and Proof tests
What test below is applied to determine the metallurgical effects of welding on austenitic stainless steels?
Ferrite Test
Application of a vacuum box to the inside surface of a steel storage tank is one from of which test?
Leak Test (LT)
FN is a unit of measurement with which test?
Ferrite Test
NDE personnel are normally qualified in accordance with:
ASNT SNT-TC-1A
