1.
Angle beam transducers and wedges are typically used to introduce a:
Refracted shear wave into the part
Longitudinal wave into the part
Reflected Shear wave into the part
Compression wave into the part
2. When a wave encounters an interface at an oblique angle, what takes place at the
interface due to the different sound velocities
Attenuation
Refraction
Beam spread
Beam impedance
3. The reason why you must ensure that a test object is thoroughly cleaned before
ultrasonic inspection is.
To enable visual inspection prior to UT inspection.
To provide a brighter surface so that any discontinuity markings will stand out.
To ensure that the probe and couplant can maintain good contact with the surface.
To minimize contamination of the couplant.
4. Primarily the velocity of sound waves is dependent on:
the pulse length
the frequency
the material in which the sound is being transmitted and the mode of vibration
none of the above
5. Couplant displaces the__________ and makes it possible to get more sound energy
into the test specimen.
Surface rust
Surface blemishes
Sound energy
Air
6. An ultrasonic testing technique in which the transducer (crystal) is at an angle to
the test surface is called:
angle beam testing
immersion testing
contact testing
through-transmission testing
7. As frequency increases, wavelength tends to:
Decrease
Scatter more from large or course grain structure
Convert to a different wave mode
Become more penetrating
8. The formula SinA/SinB = V1/V2 is used to determine:
angular relationships
phase velocities
amount of reflected sound energy
acoustic impedance
9. The ability to locate discontinuities that are close together within the material is
called:
Resolution
Sensitivity
Effectiveness
Phase delay
10. The gradual loss of sonic energy as the ultrasonic vibrations travel through the
material is referred to as.:
reflection
refraction
reproducibility
attenuation
11. A general term applied to all cracks, inclusions, blow holes etc, which cause a
reflection of sonic energy is:
a disperser
a discontinuity
an attenuation
a refractor
12. A material used between the face of a search unit and the test surface to permit or
improve the transmission of ultrasonic vibrations is:
wetting agent
couplant
acoustic transmitter
lubricant
13. An ultrasonic test using a straight beam contact search unit (probe) is being
conducted through the thickness of a flat part. This method is best for detecting:
Laminar type flaws with major dimension parallel to the rolled surface.
Transverse type flaws with major dimensions at right angles to the rolled surface.
Radial flaws with major dimensions along length but radially oriented to the rolled
surface.
None of the above.
14. The freznel zone is also known as the:
near zone
far zone
focal zone
none of the above
15. The moving of a probe along a test surface either manually or automatically is
referred to as:
scanning
attenuating
angulating
resonating
16. The ability to locate a small discontinuity is called:
Resolution
Sensitivity
Wavelength
Frequency
17. Under most circumstances, which of the following frequencies would result in the
best resolving power?
1 megahertz
5 megahertz
10 megahertz
25 megahertz
18. The area in front of a transducer where there are extensive fluctuations in the
sound field is called the:
Far field zone
Surface field zone
Near field zone
Phase shift zone
19. The sound energy or ultrasonic beam is more uniform in the:
Far field zone
Near field zone
Interface between the transducer and plastic wedge
Band along the central axis
20. What type of transducer contains two independently operating elements in a
single housing?
Crystal mosaic transducer
Dual element transducer
Liquid crystal transducer
Bi polar transducer
21. Artificial flaws can be produced by using:
Side drilled holes
Flat bottom holes
EDM notches
All of the above
22. Ultrasound is generally defined as sound at frequency above the threshold of
human hearing, which is?
20,000 MHz
20,000 Hz
2 MHz
2 Hz
23. Increasing the frequency of an ultrasonic longitudinal wave will result in
___________in the velocity of that wave.
an increase
a decrease
no change
a reversal
24. Air is not a good transmitter of ultrasound because:
the atoms vibrate randomly.
sound wave velocity is low.
the particle density is too low.
it is made up of different gases.
25. Within a given material, the speed of sound:
Is constant
Decreases with distance from the transducer
Increases with distance from the transducer
None of the above
26. Acoustic impedance is identified by the letter:
Z
I
V
P
27. In the transverse or shear wave, the particles:
Move in an elliptical pattern
Oscillate at a right angle to the direction of wave propagation
Oscillate parallel to the direction of wave propagation
Do not actually move
