Discontinuity location and size (plan view).
When a C-scan is used to produce a permanent record of an ultrasonic test, the
information displayed is typically the:
Loss of echo amplitude from discontinuities and an increase in the width of the front surface
echo.
Rough entry surface ...
NDT UT Level 2 Questions and Answers
2024/2025
Discontinuity location and size (plan view).
When a C-scan is used to produce a permanent record of an ultrasonic test, the
information displayed is typically the:
Loss of echo amplitude from discontinuities and an increase in the width of the front surface
echo.
Rough entry surface echo conditions can result in:
The attenuation
As the grain size increases in a material, its principal effect in ultrasonic testing is on:
Decrease it
In straight beam pulse echo testing a discontinuity with a rough reflecting surface
perpendicular to the incident wave will have what effect on the detected signal in
comparison to a smooth flat-bottom hole of the same size? (Increase, decrease, no
effect, decrease the width of the pulse of it.)
Machine Oil
Ultrasonic vibrations can be propagated only in the longitudinal mode in which of the
following media? (Machine oil, Aluminum, Ice, Beryllium)
The same as the velocity at 1/2 inch
If the velocity of a longitudinal mode wave in a given homogeneous material is .625
cm/micro second at 1/2 inch below the surface, what is the velocity at 2 inches below
the surface? (1/4 the velocity at 1/2 inch, 1/2 the velocity at 1/2 inch, the same, none
of the above)
If a 5.0 MHz transducer is substituted for a 2.25 MHz transducer (5.0 old, 2.25 new),
what would be the effect on the wavelength of a longitudinal mode wave in the test
specimen.
All of the above
What can cause irrelevant indications on the display screen? (Contoured surfaces,
edge effects, surface conditions, All of the above)
Reference Standard
A common method for the estimation of defect size is the use of a:
Near Field
Another name for Fresnel Zone is:
Test material parameter
Attenuation is a: (Test display characteristic, Test material parameter, Transducer
characteristic, Form of testing)
Decreased
For discontinuity geometries other than flat, the echo amplitude is usually ______ from
that observed for a flat defect, of similar orientation perpendicular to the sound
beams. (identical, increased, decreased, elongated)
Angulate the search unit
What must be done to evaluate discontinuities that are oriented at an angle to the
entry surface so that the sound beam will strike the plane of the discontinuity at right
angles?
The pulser circuit in an ultrasonic instrument is used to:
RF Display
An A-scan CRT display which shows a signal both above and below the sweep line is
called a: (Video, RF, Audio or Frequency modulated display)
B-scan display
Which display shows the distance a discontinuity is from the transducer and its length
in the direction of transducer travel?
Material Properties
The velocity of sound in a material is dependent upon the:
Sound wave frequency
To vary or change the wavelength of sound being used to test a part, you would
change the:
Ghost or "phantom" indications will appear on screen during scanning. (Wrap around)
When contact testing, if the ultrasonic instrument is set with an excessively high pulse
repetition rate, what may occur?
Increased inspection speed, ability to control and direct sound beams and adaptability for
automated scanning are all advantages of what form of testing.
The advantages of Immersion testing include:
One-fourth the test piece thickness plus 1/4 inch.
1|Page| GradeA+ | 2 0 0 2 5
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