ASNT LEVEL 1 UT EXAM NEWEST 2025 VERIFIED ANSWERS

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. ASNT ASNT 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. 36. The "25 milion eycles per second" can be stated number as: - ANSWER-25 MHz. 37. Moving a transducer over a test surface either manually or automatically is referred to as: - ANSWER-scanning. 38. A term sound waves pass through various substances is: used in ultrasonics to express the rate at which - ANSWER-velocity 39. When an indication has reached the maximum signal height which can be displayed or viewed on the display of an ultrasonic instrument, the indication is said to have reached its: - ANSWER-vertical limit. ASNT ASNT 40. An ultrasonic testing technique in which the transducer element is not parallel to the test surface is called: - ANSWER-angle beam testing. 44. Most commercial ultrasonic testing is accomplished using frequencies betweern: - ANSWER-0.2 and 25 MHz 45. In an A-scan presentation, the horizontal baseline represents the - ANSWER elapsed time or distance. 46. In an A-scan presentation, the amplitude of vertical indications on the display represents the: - ANSWER-amount of ultrasonic sound energy returning to the transducer 47. Which of the following test frequencies would generally provide the best penetration in a 305 mm (12 in.) thick specimen of coarse-grained steel? - ANSWER-1 MHz 48. In a basic ultrasonic test pattern (A-scan) for contact testing (assuming no sweep delay is used), the initial pulse is: - ANSWER-the high indication on the extreme left side of the display that represents the entry surface of the inspected part. 49. An ultrasonic test using a straight beam contact transducer is being conducted through the thickness of a flat part such as a plate. This test should detect: - ANSWER laminar-type discontinuities with major dimensions parallel to the rolled surface. 50. In ultrasonic testing, a liquid coupling medium between the crystal surface and the part surface is necessary because: - ANSWER-an air interface between the crystal surface and the part surface would almost completely reflect the ultrasonic vibrations 51. Near-surface resolution is a characteristic of an ultrasonic testing system that defines its ability to detect: - ANSWER-discontinuities located just beneath the entry surface in the part being tested. 52. During ultrasonic testing by the immersion method, it is frequently necessary to angulate the transducer when a discontinuity is located in order to: - ANSWER-obtain a maximum response if the discontinuity is not originally oriented perpendicular to the ultrasonic beam. 53. All other factors being equal, the mode of vibration that has the greatest velocity is the: - ANSWER-longitudinal wave. 54. On the area-amplitude ultrasonic standard test blocks, the flat-bottom holes in the blocks are: - ANSWER-different in diameter, increasing by 0.4 mm (0.016 in.) increments from the No. 1 block to the No. 8 block. 55. In immersion testing, verification that the transducer is normal to a flat entry surface is indicated by: - ANSWER-maximum reflection from the entry surface. ASNT ASNT 56. A piezoelectric material can: - ANSWER-convert a mechanical energy to electrical energy 57. Sound waves of a frequency beyond the hearing range of the human ear are referred to as ultrasonic waves or vibrations, and the term embraces all vibrational waves of frequency greater than approximately - ANSWER-20000 Hz 58. The velocity of sound waves is primarily dependent on the - ANSWER-material properties and wave type. 59. The primary purpose of reference blocks is to: - ANSWER-obtain a common reproducible signal. 60. When testing by the surface wave method, patches of oil or dirt on the surface may: - ANSWER-cause both an attenuation of sound and indications on the screen. 61. In immersion testing, the most commonly used couplant is: - ANSWER-water 62. The piezoelectric material in the transducer: - ANSWER-converts electrical energy into mechanical energy and mechanical energy into electrical energy 63. The shortest wavelength pulse is produced by a frequency of - ANSWER-25 MHz 64. The angle of incidence is: - ANSWER-equal to the angle of reflection. 65. On many ultrasonic testing instruments, an operator conducting an immersion test can remove that portion of the display presentation that represents water distance by adjusting a: - ANSWER-sweep delay control. 66. What is another way to express 100 000 cydles per second? - ANSWER-100 kHz 70. A transducer with a frequency greater than 10 MHz will most likely be used during: - ANSWER-an immersion test. 71. The reference holes in standard aluminum area-amplitude ultrasonic test blocks contain - ANSWER-flat-bottom ho