EMC UT Flashcards
Cold shuts are __________________ discontinuities.
a) inherent
b) processing
c) service
d) any of the above
a) inherent
A welding defect that occurs in the root pass and runs parallel with the weld is:
a) incomplete fusion between beads.
b) icicle.
c) crater crack.
d) incomplete joint penetration.
d) incomplete joint penetration.
A burst is a discontinuity that may be found in:
a) a forging.
b) a rolled product.
c) an extrusion.
d) any of the above
d) any of the above
A stress corrosion crack is a defect of:
a) casting.
b) welding.
c) metal forming.
d) service.
d) service.
Acoustic pressure along the beam axis moving away from the probe has various maxima and
minima due to interference. At the end of the near field pressure is:
a) a maximum
b) a minimum
c) the average of all maxima and minima
d) none of the above
a) a maximum
The main contribution to loss of sound pressure of a beam incident on a rough surface is provided
by:
a) sound dispersion
b) mode conversion
c) refraction
d) diffraction
a) sound dispersion
The ability to separate individual defects lying closely together is called:
a) sensitivity
b) resolution
c) angular acuity
d) linearity
b) resolution
In immersion testing you would normally position the:
a) entrance echo on the right edge of the CRT.
b) entrance echo on the left of the CRT.
c) first backwall on the right edge of the CRT.
d) none of the above
b) entrance echo on the left of the CRT.
- The preferred presentation method for determining the amplitude of an echo signal is the:
a) A-scan.
b) B-scan.
c) C-scan.
d) D-scan.
a) A-scan.
The purpose of the IIW block is to determine:
a) probe exit point
b) refracted angle
c) range (or depth scale)
d) all of the above
d) all of the above
Which of the following factors can have a negative influence on some nondestructive tests?
a) Grain size.
b) Grain orientation.
c) Grain boundary composition.
d) All of the above.
d) All of the above.
In which of the following welding processes is filler metal never added?
a) Brazing
b) Soldering
c) Arc welding
d) Spot welding
d) Spot welding
A generally smooth indentation on a cast surface resulting from the meeting of two streams of
metal coming from different directions and failing to fuse is called a:
a) stringer.
b) hot tear.
c) cold shut.
d) lap
c) cold shut.
Improper cleaning or insufficient preheating of a weldment, or moisture on the base metal or the
filler metal could cause:
a) crater cracks.
b) porosity.
c) undercutting.
d) excessive penetration
b) porosity.
Rayleigh waves can be used in steel to penetrate up to:
a) 10 mm.
b) 10 cm.
c) 1 m.
d) 1 wavelength
d) 1 wavelength
For best results detecting a defect that may be irregularly shaped and slightly off perpendicular to
the beam, the wavelength used should be:
a) the size of the defect
b) as small as possible
c) as large as possible to locate the defect
d) 1 MHz
c) as large as possible to locate the defect
A surface can be considered smooth if its irregularities are not more than _____ wavelength.
a) 1
b) 1/3
c) 1/10
d) 1/100
b) 1/3
When testing a 30 mm diameter, 500 mm long shaft from the flat end of the shaft using
longitudinal waves from a 20 mm diameter 2 MHz probe, numerous signals are seen on the
screen after 500 mm. These are:
a) ghost images
b) side wall echos
c) internal thread indications
d) none of the above
b) side wall echos
In weld inspection, transverse cracks are best located by:
a) scanning at right angles to the weld axis
b) scanning parallel to the weld axis
c) the lamination scan
d) immersion testing
b) scanning parallel to the weld axis
For a shear wave travelling from steel to water incident on the boundary at 10 degrees will give a
refracted shear wave in water with an angle of:
a) 0 degrees
b) degrees
c) 20 degrees
d) none of the above
d) none of the above
