ASNT Level 1 UT Questions Solved 100% Correct 2023

the back-surface reflection. - ANSWER-1. The indication on the instrument display that represents the far boundary of material being tested is called: angulation. - ANSWER-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: coaxial cable - ANSWER-3. The technical name for the cable that connects the ultrasonic instrument to the transducer is: calibration. - ANSWER-4. The process of standardizing an instrument or device by using a reference standard is called: longitudinal wave. - ANSWER-5. Another name for a compressional wave is: surface waves. - ANSWER-6. Another name for rayleigh waves is : a couplant. - ANSWER-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: crystal. - ANSWER-8. The piezoelectric material in a transducer that vibrates to produce ultrasonic waves is called a straight beam testing. - ANSWER-9. Ultrasonic testing of material where the probe is in direct contact with the material being tested may be: is one of the most efficient receivers of ultrasonic energy - ANSWER-10. An advantage of using lithium sulfate in transducers is that it: 25 MHz transducer - ANSWER-12. The transducer that contains the thinnest piezoelectric crystal is a: 1 MHz - ANSWER-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 frequency and crystal size. - ANSWER-14. The amount of beam divergence from a crystal is primarily dependent on the refraction. - ANSWER-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: two times - ANSWER-21. The velocity of longitudinal waves is approximately __________ the velocity of shear waves in the same material. 25 MHz - ANSWER-27. Under most circumstances, which of the following frequencies would result in the best resolving power? A coarse-grained casting. - ANSWER-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? initial pulse. - ANSWER-29. In contact testing, the entry surface indication is sometimes referred to as the: coarse-grained material. - ANSWER-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: through-transmission testing - ANSWER-31. A test method employing two separate transducers on opposite surfaces of the material being tested is called frequency - ANSWER-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 an interface. - ANSWER-33. The boundary between two different materials that are in contact with each other is called: longitudinal wave. - ANSWER-34. When the motion of the particles of a medium is transverse to the direction of propagation, the wave being transmitted is called a: 25 MHz. - ANSWER-36. The "25 milion eycles per second" can be stated number as: scanning. - ANSWER-37. Moving a transducer over a test surface either manually or automatically is referred to as: velocity - ANSWER-38. A term sound waves pass through various substances is: used in ultrasonics to express the rate at which vertical limit. - ANSWER-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: angle beam testing. - ANSWER-40. An ultrasonic testing technique in which the transducer element is not parallel to the test surface is called: 0.2 and 25 MHz - ANSWER-44. Most commercial ultrasonic testing is accomplished using frequencies betweern: elapsed time or distance. - ANSWER-45. In an A-scan presentation, the horizontal baseline represents the amount of ultrasonic sound energy returning to the transducer - ANSWER-46. In an A-scan presentation, the amplitude of vertical indications on the display represents the: 1 MHz - ANSWER-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? the high indication on the extreme left side of the display that represents the entry surface of the inspected part. - ANSWER-48. In a basic ultrasonic test pattern (A-scan) for contact testing (assuming no sweep delay is used), the initial pulse is: laminar-type discontinuities with major dimensions parallel to the rolled surface. - ANSWER-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: an air interface between the crystal surface and the part surface would almost completely reflect the ultrasonic vibrations - ANSWER-50. In ultrasonic testing, a liquid coupling medium between the crystal surface and the part surface is necessary because: discontinuities located just beneath the entry-surface in the part being tested. - ANSWER-51. Near-surface resolution is a characteristic of an ultrasonic testing system that defines its ability to detect: obtain a maximum response if the discontinuity is not originally oriented perpendicular to the ultrasonic beam. - ANSWER-52. During ultrasonic testing by the immersion method, it is frequently necessary to angulate the transducer when a discontinuity is located in order to: longitudinal wave. - ANSWER-53. All other factors being equal, the mode of vibration that has the greatest velocity is the: different in diameter, increasing by 0.4 mm (0.016 in.) increments from the No. 1 block to the No. 8 block. - ANSWER-54. On the area-amplitude ultrasonic standard test blocks, the flat-bottom holes in the blocks are: maximum reflection from the entry surface. - ANSWER-55. In immersion testing, verification that the transducer is normal to a flat entry surface is indicated by: convert a mechanical energy to electrical energy - ANSWER-56. A piezoelectric material can: 20000 Hz - ANSWER-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 material properties and wave type. - ANSWER-58. The velocity of sound waves is primarily dependent on the obtain a common reproducible signal. - ANSWER-59. The primary purpose of reference blocks is to: cause both an attenuation of sound and indications on the screen. - ANSWER-60. When testing by the surface wave method, patches of oil or dirt on the surface may: water - ANSWER-61. In immersion testing, the most commonly used couplant is: converts electrical energy into mechanical energy and mechanical energy into electrical energy - ANSWER-62. The piezoelectric material in the transducer: 25 MHz - ANSWER-63. The shortest wavelength pulse is produced by a frequency of equal to the angle of reflection. - ANSWER-64. The angle of incidence is: sweep delay control. - ANSWER-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: 100 kHz - ANSWER-66. What is another way to express 100 000 cydles per second? an immersion test. - ANSWER-70. A transducer with a frequency greater than 10 MHz will most likely be used during: flat-bottom holes. - ANSWER-71. The reference holes in standard aluminum area-amplitude ultrasonic test blocks contain attenuation. - ANSWER-72. The gradual loss of sonic energy as the ultrasonic vibrations travel through the material is referred to as: grass or hash. - ANSWER-73. A term used to describe numerous small indications on the instrument display resulting from test part structure, numerous small discontinuities, or both is often referred to as no change in its velocity - ANSWER-74. When testing a plate, increasing the frequency of an ultrasonic longitudinal wave results in: pulse echo testing - ANSWER-75. Ultrasonic waves transmitted into and received from the test material in the form of repetitive bursts of acoustic energy is called: reference blocks. - ANSWER-76. Metal blocks, which contain one or more drilled holes or notches to simulate discontinuities, are called: a straight beam test - ANSWER-77. If the major dimensions of a discontinuity in a 152 mm (6 in.) thick aluminum plate lie parallel to the entry surface at a depth of 76 mm (3 in.), it will be best detected by: through-transmission testing method. - ANSWER-78. The presence of a discontinuity will not produce a specific discontinuity indication on the ultrasonic instrument display when using the: through-transmission testing method. - ANSWER-79. The depth of a discontinuity cannot be determined when using the 10 MHz - ANSWER-80. When inspecting coarse-grained material, a sound wave is most easily scattered by the grain structure by a frequency of 1 MHz transducer - ANSWER-81. The thickest crystal is contained in a: a surface discontinuity. - ANSWER-82. When performing a surface wave test, indications may result from: 2 mm (0.08 in.) diameter flat-surfaced discontinuity whose major face is perpendicular to the direction of sound beam propagation. - ANSWER-83. Which of the following discontinuities located 152 mm (6 in.) from the entry surface results in the largest display indication if all factors except discontinuity surface condition and orientation are the same? for angle beam contact testing - ANSWER-84. Transducers constructed with a plastic wedge or standoff between the transducer element and the test piece are commonly used: acoustic lenses - ANSWER-85. Sound can be focused by special curved adapters located in front of the transducer element. These adapters are referred to as: immersion testing. - ANSWER-86. A test method in which the parts to be inspected are placed in a water bath or some other liquid couplant is called: an electronic gate. - ANSWER-87. A separate time baseline imposed on the viewing permits measurement of distances is often referred display of some ultrasonic testing instruments that to as: resolution. - ANSWER-88. A term used to describe the ability of an ultrasonic testing system to distinguish between the entry-surface response and the response of discontinuities near the entry surface is: refraction. - ANSWER-89. The phenomenon whereby an ultrasonic wave between materials with different velocities is called: changes direction when the wave crosses a boundary the angle of reflection. - ANSWER-90. In a test where the transducer is not perpendicular to the inspection surface, the angle of incidence is equal to: acoustic impedance. - ANSWER-91. The product of the acoustic velocity of sound in a material and the density of the material is the factor that determines the amount of reflection or transmission of ultrasonic energy when it reaches an interface. This is called: rayleigh waves. - ANSWER-93. Ultrasonic waves that travel along the surface of a material and whose particle motion is elliptical are called: fresnel zone. - ANSWER-94. The interference field near the face of a transducer is often referred to as the shear wave - ANSWER-95. When the incident angle is chosen to be between the first and second critical angles, the ultrasonic wave mode within the part will be a: Snell's law. - ANSWER-96. The formula used to calculate the angle of refraction within a material is called: decrease - ANSWER-97. In a material with a given velocity, when frequency is increased, the wavelength will: receiver-amplifier circuits. - ANSWER-98. Circuits that electronically amplify return signals from the receiving transducer and often modify the signals into a form suitable for display are called: an A-scan display - ANSWER-99. The most common type of data display used for ultrasonic examination of welds is: an A-scan display. - ANSWER-100. The display that plots signal amplitude versus time is called: receiver-amplifier - ANSWER-101. A circuit that modifies the return signal from the receiving transducer into a form suitable for display on an oscilloscope or other output device is called a: pulser. - ANSWER-102. A circuit that generates a burst of voltage that is applied to the sending transducer is called clock - ANSWER-103. A circuit that coordinates electronic operation of the entire ultrasonic instrument system is called: C-scan display - ANSWER-104. A plan view display or recording of a part under examination is called B-scan presentation. - ANSWER-105. Ultrasonic data, which is presented in a form representative of the cross section of the test specimen, is called: Immersion testing - ANSWER-What type of ultrasonic examination uses wheel-type transducers that eliminate the use of a tank? detection of obliquely oriented discontinuities. - ANSWER-107. In addition to other functions, a transducer manipulator in a mechanical immersion-scanning unit permits: C-scan presentation. - ANSWER-108. A type of data presentation most likely to be used with a high-speed automatic scanning system is: bridge. - ANSWER-109. The component in a conventional immersion system that spans the width of the immersion tank is called: