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NDT UT Level 1 Exam-Questions with Correct Answers/ Verified/ Latest 2024/2025
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NDT UT Level 1 Exam-Questions with Correct Answers/ Verified/ Latest 2024/2025
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NDT UT Level 1 Exam-Questions with Correct Answers/ Verified/Latest 2024/2025
Ultrasonic Waves that travel along the surface of a material and whose particle motion is
elliptical. - ✔✔Rayleigh Waves (Surface/Love Waves)
In a material with a given velocity, when frequency is increased, the wavelength will __? -
✔✔Decrease
Ultrasonic vibrations can be propagated only in the longitudinal mode in which media? -
✔✔Machine Oil (Liquid)
If a 5.0 Mhz transducer is substituted for a 2.25 Mhz transducer ( 2.25 old/5.0 new), what
would be the effect on the wavelength of the longitudinal wave mode produced in the test
specimen. (i.e. shorter, longer or same)? - ✔✔Wavelength would decrease (Mhz increase =
wavelength decrease)
The velocity of a sound in a material is dependent upon the: Frequency of the wave,
Wavelength, Material Properties, Vibration Cycle. - ✔✔Material Properties
To vary or change the wavelength of sound being used to test a part, you would change the:
Sound Wave Frequency, Diameter of the Transducer, Electrical Pulse Voltage , Pulse
Repetition Rate. - ✔✔Sound Wave Frequency
Ultrasonic vibrations are commonly used to: Examine materials for discontinuities, examine
materials for thickness, examine materials for mechanical properties, all of the above. -
✔✔All of the above
Another name for a compressional wave: - ✔✔Longitudinal Wave
Another name for Rayleigh Waves: - ✔✔Surface Waves
, When the motion of the particles of a medium is parallel to the direction of the propagation,
the wavelength transmitted is called a: - ✔✔Longitudinal Wave
When the motion of the particles of a medium is transverse to the direction of the
propagation, the wavelength transmitted is called a: - ✔✔Shear Wave
"25 million cycles per second" can also be stated as: - ✔✔25 megahertz
A term used in ultrasonics to express the rate at which sound waves pass through various
substances is: - ✔✔Velocity
Which of the following modes of vibration has the greatest velocity? - ✔✔Longitudinal
Wave (Approximately 2x faster than Shear, Surface waves are 90% speed of shear and 45%
of Longitudinal)
Sound waves of a frequency beyond the hearing range of the human ear are referred to as
ultrasonic waves, these have a frequency greater than approximately: - ✔✔20,000 hertz
(20Hz to 20,000 Hz or 20Khz is within hearing range)
"100,000 cycles per second" can be written as: - ✔✔100 kilohertz
Increasing the frequency of an ultrasound longitudinal wave will have what impact on
velocity: (Increase, decrease or no change) - ✔✔No change in velocity (Only if material
properties change or wave mode is changed)
If the velocity of a wave is 6.3 km per second at 1/2 inch below the surface, what is the
velocity at 2 inches below the surface? - ✔✔Same as the velocity at 1/2 inch
Surface (Rayleigh) Waves traveling on the top face of a block: Are not reflected from a sharp
edge corner. Are reflected from a sharp edge corner. Travel through the sharp edge corner
and are reflected from the lower edge. Are absorbed by a sharp corner. - ✔✔Are reflected
from a sharp edge corner
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