ASNT Level 1 UT ACTUAL QUESTIONS
AND CORRECT DETAILED ANSWERS |
SCORED A+ | NEW UPDATE 2025
1. The indication on the instrument display that represents the far boundary of
material being tested is called: - ANSWER the back-surface reflection.
2. In immersion testing, the position of the transducer is often varied by a
manipulator to transmit sound into the test part at various angles to the front
surface. Such a procedure is referred to as: - ANSWER angulation.
3. The technical name for the cable that connects the ultrasonic instrument to the
transducer is: - ANSWER coaxial cable
4. The process of standardizing an instrument or device by using a reference
standard is called: - ANSWER calibration.
5. Another name for a compressional wave is: - ANSWER longitudinal wave.
6. Another name for rayleigh waves is : - ANSWER surface waves.
7. A material used between the face of a transducer and the test surface to permit
or improve the transmission of ultrasonic vibrations from the transducer to the
material being tested is called: - ANSWER a couplant.
,8. The piezoelectric material in a transducer that vibrates to produce ultrasonic
waves is called a - ANSWER crystal.
9. Ultrasonic testing of material where the probe is in direct contact with the
material being tested may be: - ANSWER straight beam testing.
10. An advantage of using lithium sulfate in transducers is that it: - ANSWER is
one of the most efficient receivers of ultrasonic energy
12. The transducer that contains the thinnest piezoelectric crystal is a: -
ANSWER 25 MHz transducer
13. Penetration of ultrasonic waves in a material is normally the function of test
frequency used. The greatest depth of penetration is provided by a frequency of -
ANSWER 1 MHz
14. The amount of beam divergence from a crystal is primarily dependent on the -
ANSWER frequency and crystal size.
15. When an ultrasonic beam passes through the interface between two dissimilar
materials at an angle, a new angle of sound travel takes place in the second
material due to: - ANSWER refraction.
21. The velocity of longitudinal waves is approximately __________ the velocity of
shear waves in the same material. - ANSWER two times
, 27. Under most circumstances, which of the following frequencies would result in
the best resolving power? - ANSWER 25 MHz
28. Which of the following materials of the same alloy is most like ly to produce
the greatest amount of sound attenuation over a given distance? - ANSWER A
coarse-grained casting.
29. In contact testing, the entry surface indication is sometimes referred to as the:
- ANSWER initial pulse.
30. An ultrasonic instrument display pattern containing a large number of low-
level indications (often referred to as grass or hash) could be caused by: -
ANSWER coarse-grained material.
31. A test method employing two separate transducers on opposite surfaces of
the material being tested is called - ANSWER through-transmission testing
32. The number of complete waves that pass a given point in a given period of
time (usually 1 s) is referred to as the - ANSWER frequency
33. The boundary between two different materials that are in contact with each
other is called: - ANSWER an interface.
34. When the motion of the particles of a medium is transverse to the direction of
propagation, the wave being transmitted is called a: - ANSWER longitudinal
wave.
AND CORRECT DETAILED ANSWERS |
SCORED A+ | NEW UPDATE 2025
1. The indication on the instrument display that represents the far boundary of
material being tested is called: - ANSWER the back-surface reflection.
2. In immersion testing, the position of the transducer is often varied by a
manipulator to transmit sound into the test part at various angles to the front
surface. Such a procedure is referred to as: - ANSWER angulation.
3. The technical name for the cable that connects the ultrasonic instrument to the
transducer is: - ANSWER coaxial cable
4. The process of standardizing an instrument or device by using a reference
standard is called: - ANSWER calibration.
5. Another name for a compressional wave is: - ANSWER longitudinal wave.
6. Another name for rayleigh waves is : - ANSWER surface waves.
7. A material used between the face of a transducer and the test surface to permit
or improve the transmission of ultrasonic vibrations from the transducer to the
material being tested is called: - ANSWER a couplant.
,8. The piezoelectric material in a transducer that vibrates to produce ultrasonic
waves is called a - ANSWER crystal.
9. Ultrasonic testing of material where the probe is in direct contact with the
material being tested may be: - ANSWER straight beam testing.
10. An advantage of using lithium sulfate in transducers is that it: - ANSWER is
one of the most efficient receivers of ultrasonic energy
12. The transducer that contains the thinnest piezoelectric crystal is a: -
ANSWER 25 MHz transducer
13. Penetration of ultrasonic waves in a material is normally the function of test
frequency used. The greatest depth of penetration is provided by a frequency of -
ANSWER 1 MHz
14. The amount of beam divergence from a crystal is primarily dependent on the -
ANSWER frequency and crystal size.
15. When an ultrasonic beam passes through the interface between two dissimilar
materials at an angle, a new angle of sound travel takes place in the second
material due to: - ANSWER refraction.
21. The velocity of longitudinal waves is approximately __________ the velocity of
shear waves in the same material. - ANSWER two times
, 27. Under most circumstances, which of the following frequencies would result in
the best resolving power? - ANSWER 25 MHz
28. Which of the following materials of the same alloy is most like ly to produce
the greatest amount of sound attenuation over a given distance? - ANSWER A
coarse-grained casting.
29. In contact testing, the entry surface indication is sometimes referred to as the:
- ANSWER initial pulse.
30. An ultrasonic instrument display pattern containing a large number of low-
level indications (often referred to as grass or hash) could be caused by: -
ANSWER coarse-grained material.
31. A test method employing two separate transducers on opposite surfaces of
the material being tested is called - ANSWER through-transmission testing
32. The number of complete waves that pass a given point in a given period of
time (usually 1 s) is referred to as the - ANSWER frequency
33. The boundary between two different materials that are in contact with each
other is called: - ANSWER an interface.
34. When the motion of the particles of a medium is transverse to the direction of
propagation, the wave being transmitted is called a: - ANSWER longitudinal
wave.
