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NDT ultrasonic level 1 Exam-Questions with Correct Answers/ Verified/ Latest 2024/2025
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NDT ultrasonic level 1 Exam-Questions with Correct Answers/ Verified/ Latest 2024/2025
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NDT ultrasonic level 1 Exam-Questions with Correct Answers/Verified/ Latest 2024/2025
The velocity of longitudinal wave is determined by the - ✔✔material properties
The material in a search unit which controls the search unit ringing is called - ✔✔the
damping material
Which of the following search units would contain the thinnest crystal - ✔✔the crystal
vibrating at the highest frequency
Piezoelectric crystals convert - ✔✔electrical energy to mechanical energy
or mechanical energy to electrical
The number of complete waves which pass a given point in a given time period is referred to
as the - ✔✔frequency
Ultrasonic sound is defined as sound whose frequencies exceed - ✔✔20000 Hz
What is the formula for for solving for wavelength - ✔✔W=V/F
Which instrument control is used to adjust signal height - ✔✔gain
if frequency is increased in a given material, wavelength will - ✔✔decrease
which instrument control alters the spacing between signals - ✔✔range
the indication on the oscilloscope screen which represents the far boundary of the material
being tested is called - ✔✔the back reflection
, the piezoelectric material in a search unit or probe which vibrates to produce ultrasonic
waves is called - ✔✔a crystal
the ultrasonic testing of material where the search unit is in direct contact with the material
being tested is called - ✔✔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 - ✔✔through-transmission testing
the number 25 million cycles per second can also be stated as - ✔✔25 MHz
the moving of a test probe along a surface either manually or automatically is referred to as
- ✔✔scanning
most commercial ultrasonic testing is accomplished using frequencies between - ✔✔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 - ✔✔20,000 cycles per second
a disadvantage of using natural quartz crystals in a search unit is - ✔✔it is the least efficient
generator of ultrasonic energy of all commonly used
an advantage of using ceramic in search units is - ✔✔it is one of the most efficient
generators of ultrasonic energy
an advantage of using lithium sulfate in search units is - ✔✔it is one of the most efficient
receivers of ultrasonic energy
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