NDT ultrasonic level 1 Exam Study Guide with Correct Answers
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Course
2024/2025
Institution
2024/2025
NDT ultrasonic level 1 Exam Study Guide
with Correct Answers
the velocity of longitudinal wave is determined by the - Answer-material properties
the material in a search unit which controls the search unit ringing is called - Answer-the damping
material
which of the following search units woul...
the indication on the oscilloscope screen which represents the far boundary of the material being tested
is called - Answer✔✔-the back reflection
the piezoelectric material in a search unit or probe which vibrates to produce ultrasonic waves is called -
Answer✔✔-a crystal
the ultrasonic testing of material where the search unit is in direct contact with the material being tested
is called - Answer✔✔-straight beam contact testing
surface wave tesing
or angle beam testing
a test method employing two seperate search units(or probes) on opposite surfaces of the material
being tested is called - Answer✔✔-through-transmission testing
the number 25 million cycles per second can also be stated as - Answer✔✔-25 MHz
the moving of a test probe along a surface either manually or automatically is referred to as -
Answer✔✔-scanning
most commercial ultrasonic testing is accomplished using frequencies between - Answer✔✔-0.5 - 25
MHz
sound waves of a frequency beyond the hearing range of the human ear are reffered to as ultrasonic
waves or vibrations, and the term embraces all vibrational waves of a frequency greater than approx -
Answer✔✔-20,000 cycles per second
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