Ultrasonic waves propagate through test materials in the form of:
A. electromagnetic waves.
B. low-voltage electric fields.
C. discontinuous radio waves.
D. mechanical vibrations.
1) - D
When an ultrasonic beam passes through the interface of two dissimilar materials at an angle, a new angle of sound travel takes place in the second material due to:
A. refraction.
B. attenuation.
C. rarefaction.
D. compression.
2) - A
What is the gradual loss of energy called as ultrasonic vibrations travel through a material?
A. Reflection
B. Refraction
C. Compression
D. Attenuation
3) - D
Ultrasonic velocities are different for different materials. These differences are primarily caused by differences in the materials’:
A. frequency and wavelength.
B. thickness and travel time.
C. elasticity and density.
D. chemistry and permeability.
4) - C
Why is ultrasonic energy for immersion testing transmitted to the test object as a compressional wave?
A. Compressional waves travel faster and will therefore reduce the distance of the interface signal.
B. Liquids will only sustain compressional waves.
C. Compressional waves are used with immersion testing only.
D. The higher intensity of compressional waves is necessary to overcome high attenuation in liquids.
5) - B
When inspecting coarse-grained materials, which frequency scatters most?
A. 1.0 MHz
B. 2.25 MHz
C. 5 MHz
D. 10 MHz
6) - D
Why shear waves more sensitive?
A. shorter wavelength.
B. not dispersed as easily.
C. vibration direction.
D. longer wavelength.
7) - A
Term for ability to detect small echoes:
A. Resolution.
B. Sensitivity.
C. Definition.
D. Gain.
8) - B
Resonance condition from:
A. Continuous longitudinal waves.
B. Pulsed longitudinal waves.
C. Pulsed shear waves.
D. Continuous shear waves.
9) - A
Basic UT display:
A. automatic read‑out.
B. A‑scan.
C. B‑scan.
D. C‑scan.
10) - B
Component producing activation voltage:
A. amplifier
B. receiver
C. pulser
D. synchronizer
11) - C
Purpose of reference blocks:
A. max back reflections
B. greatest sensitivity
C. known reflecting area
D. size/orientation of discontinuity
12) - C
DAC compensates for:
A. attenuation, distance, beam spread.
B. noise amplitude.
C. velocity changes.
D. vertical nonlinearity.
13) - A
Area‑amplitude block holes:
A. same diameters.
B. different diameters increasing 1/64 in.
C. largest in block 1.
D. drilled at different depths.
14) - B
Least influence on reflection:
A. size
B. orientation
C. type
D. frequency
15) - D
Ability to locate close discontinuities:
A. resolution
B. sensitivity
C. effectiveness
D. phase delay
16) - A
Lack of parallelism results:
A. no back reflections
B. difficult to locate parallel discontinuities
C. porous metal
D. decreased penetration
17) - A
Thickness error if:
A. velocity constant
B. velocity deviates
C. water coupling used
D. longitudinal waves used
18) - B
Shear waves induced by:
A. X‑cut crystal
B. two transducers
C. angle‑beam wedge
D. acoustic lens
19) - C
Immersion shear wave method:
A. longitudinal perpendicular
B. two crystals
C. low‑frequency transducer
D. angulating transducer
20) - D
Proof search unit normal:
A. max entry reflection
B. eliminate multiples
C. max back reflection
D. max initial pulse
21) - A
Water distance:
A. minimal
B. no effect
C. same as calibration
D. maximal
22) - C
Best for weld fusion zone:
A. angle‑beam surface waves
B. immersion surface waves
C. resonance
D. angle‑beam shear waves
23) - D
Thin sheet laminar discontinuities show:
A. amplitude front surface
B. multiple reflections
C. initial pulse amplitude
D. walking signals
24) - D
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SNT-TC-1A (2024)89
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ANSI ASNT CP-189 (2024)43
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Acoustic Emission Testing10
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Electromagnetic Testing28
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Leak Testing18
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Liquid Penetrant Testing30
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Magnetic Flux Leakage21
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Magnetic Particle Testing29
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Neutron Radiography30
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Radiographic Testing27
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Thermal/Infrared21
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Ultrasonic Testing33
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Visual Testing17
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MATERIALS, FABRICATION, AND PRODUCT TECHNOLOGY183
