UT Level 2
199. Reducing the extent of the dead zone of a transducer by using a delay tip results in: a. Improved distance amplitude correction in the near field b. Reduced frequency of the primary ultrasonic beam c. Reduced ability to detect flaws in the near field d. Improved accuracy in thickness measurement of thin plate and sheet e. None of the above
d
2. Which of the following would be considered application(s) of ultrasonic techniques? a. Determination of a material's elastic modulus b. Study of a material's metallurgical structure c. Measurement of a material's thickness d. All of the above
d
202. The principal applications of ultrasonic techniques consist of: a. Flaw detection b. Thickness measurements c. Determination of elastic moduli d. All of the above e. None of the above
d
205. In immersion shear wave testing, waves are normally generated by angulating the transducer beyond the first critical angle. What is the direction of the material's particle motion? a. The same as the wave propagation b. Normal to the material surface c. Parallel to the direction of wave propagation d. Perpendicular to the direction of wave propagation e. Only surface waves existed beyond the first critical angle
d
206. Which of the following modes of vibration are quickly dampened out when testing by the immersion method? a. Longitudinal waves b. Shear waves v. Transverse waves d. Surface waves
d
207. The most commonly used method of producing shear waves in a test part when inspecting by the immersion method is: a. By transmitting longitudinal waves into a part in a direction perpendicular to its front surface b. By using two crystals vibrating at different frequencies c. By using Y-cut quartz crystal d. By angulating the search tube or manipulator to the proper angle
d
26. Which of the following scanning methods could be classified as an immersion type test? a. Tank in which the search unit and test piece are immersed b. Squirter bubbler method in which the sound is transmitted in a column of flowing water c. Scanning with a wheel-type search unit with the transducer inside a liquid filled tire d. All of the above
d
28. Using the immersion method, a distance amplitude curve (DAC) for a 19mm (0.75in) diameter, 5 MHz search unit shows the high point of the DAC at the B/51mm (2in) block. One day later, the high point of the DAC for the same search unit is at the J/102mm (4in) block. Assuming that calibration has not changed, this would indicate that the search unit: a. Is improving in resolution b. Is becoming defective c. Has the beam of a smaller search unit d. Both b and c
d
31. When using focused transducers, non-symmetry in a propagated sound beam may be caused by: a. Backing material variations b. Lens centering or misalignment c. Porosity in lenses d. All of the above
d
32. Ultrasonic wheel units may be used for which of the following types of examinations? a. Straight or longitudinal examination b. Angle beam or shear wave examination c. Surface wave or Rayleigh wave examination d. All of the above
d
38. On an A-scan display, what represents the intensity of a reflected beam? a. Echo pulse width b. Horizontal screen location c. Signal brightness d. Signal amplitude
d
40. In immersion testing in a small tank, a manually operated manipulator is used to: a. Set the proper water path b. Set the proper transducer angle c. Set the proper index function d. Both a and b
d
41. A 45 degree shear angle beam transducer produces a wave in the metal that is polarized: a. Perpendicular to the direction of propagation and parallel to the entry surface b. In the direction of propagation and at 45 degrees to the normal to the entry surface c. Perpendicular to the entry surface d. Perpendicular to the direction of propagation and 45 degrees to the entry surface
d
42. In straight (normal) beam contact testing, a reduction in the back surface reflection amplitude could indicate: a. Inadequate coupling b. A flaw which is not normal to the beam c. A near surface defect that cannot be resolved from the main bang (initial pulse) d. All of the above
d
51. During a straight beam ultrasonic test, a discontinuity indication is detected that is small in amplitude compared to the loss in amplitude of back reflection. The orientation of this discontinuity is probably: a. Parallel to the test surface b. Perpendicular to the sound beam c. Parallel to the sound beam d. At an angle to the test surface
d
55. A smooth flat discontinuity whose major plane is not perpendicular to the direction of sound propagation may be indicated by: a. An echo amplitude comparable in magnitude to the back surface reflection b. A complete loss of back surface reflection c. An echo amplitude larger in magnitude than the back surface reflection d. All of the above
d
6. Acoustic energy propagates in different modes. Which of the following represent a mode? a. Longitudinal wave b. Shear wave c. Surface wave d. All of the above
d
61. Attenuation is a difficult quantity to measure accurately, particularly in solid materials, at the test frequencies normally used. The overall result usually observed includes other loss mechanisms which can include: a. Beam spread b. Couplant mismatch c. Test piece geometry d. All of the above
d
63. Large grains in a metallic test specimen usually result in: a. Decrease or loss of back surface reflection b. Large "hash" or noise indications c. Decrease in penetration d. All of the above
d
67. In Figure 3, transducer A is being used to establish: a. Verification of wedge angle b. Sensitivity calibration c. Resolution d. Index point
d
69. In Figure 3, transducer D is being used to check: a. Sensitivity calibration b. Distance calibration c. Resolution d. Verification of wedge angle
d
7. The simple experiment where a stick in a glass of water appears disjointed at the water surface illustrates the phenomenon of: a. Reflection b. Magnification c. Refraction d. Diffraction
d
76. The attenuation of energy within a material in the far field of the ultrasonic beam may be expressed as the: a. Arithmetic mean b. Geometrical average c. Exponential average d. Exponential decay
d
84. The process of adjusting an instrument or device to a reference standard is referred to as: a. Angulation b. Scanning c. Correcting for distance amplitude variations d. Calibration
d
9. The random distribution of crystallographic direction in alloys with large crystalline structures is a factor in determining: a. Acoustic noise levels b. Selection of test frequency c. Scattering of sound d. All of the above
d
90. A short burst of alternating electrical energy is called: a. A continuous wave b. A peaked DC voltage c. An ultrasonic wave d. A pulse
d
92. The phenomenon by which a wave strikes a boundary and changes the direction of its propagation within the same medium is referred to as: a. Divergence b. Impedance c. Angulation d. Reflection
d
95. Which of the following modes of vibration exhibits the shortest wavelength at a given frequency and in a given material? a. Longitudinal wave b. Compression wave c. Shear wave d. Surface wave
d
173. When testing a part with a rough surface, it is generally advisable to use: a. A lower frequency search unit and a more viscous couplant than is used on parts with a smooth surface b. A higher frequency search unit and a more viscous couplant than is used on parts with a smooth surface c. A higher frequency search unit and a less viscous couplant than is used on parts with a smooth surface d. A lower frequency search unit and a less viscous couplant than is used on parts with a smooth surface
a
179. To evaluate and accurately locate discontinuities after scanning a part with a paintbrush transducer, it is generally necessary to use a: a. Search unit with a smaller crystal b. Scrubber c. Grid map d. Crystal collimator
a
18. As frequency increases in ultrasonic testing, the angle of beam divergence of a given diameter crystal: a. Decreases b. Remains unchanged c. Increases d. Varies uniformly through each wavelength
a
181. As the impedance ratio of two dissimilar materials increases, the percentage of sound coupled through an interface of such materials: a. Decreases b. Increases c. Is not changed d. May increase or decrease
a
186. In immersion testing, irrelevant or false indications caused by contoured surfaces are likely to result in a: a. Broad-based indication b. Peaked indication c. "Hashy" signal d. Narrow-based indication
a
19. As the radius of curvature of a curved lens is increased, the focal length of the lens will: a. Increase b. Decrease c. Remain the same d. Be indeterminate unless the frequency is known
a
194. Increasing the length of the pulse used to activate the search unit will: a. Increase the strength of the ultrasound but decrease the resolving power of the instrument b. Increase the resolving power of the instrument c. Have no effect on the test d. Decrease the penetration of the sound wave
a
195. The lack of parallelism between the entry surface and the back surface: a. May result in a screen pattern that does not contain back reflection indications b. Makes it difficult to locate discontinuities that lie parallel to the entry surface c. Usually indicates that a porous condition exists in the metal d. Will decrease the penetrating power of the test
a
201. The technique of examining an ultrasonic reflector from different directions might be used to enable the technician to: a. Distinguish between different types of flaws b. Predict the useful service life of the test specimens c. Distinguish between flaw indications and spurious or false indications d. All of the above e. None of the above
a
204. When setting up an ultrasonic inspection, the repetition frequency of the ultrasonic instrument should be set: a. So that its period is at least as long as the operating time b. The same as the transducer resonance frequency c. As low as possible to avoid overpulsing and distortion d. According to the instruction manual of the instrument e. None of the above
a
21. If a contact angle beam transducer produces 45 degree shear wave in steel, the angle produced by the same transducer in an aluminum specimen would be: (VSteel = 0.323 cm/micro sec: VSal = 0.310 cm/micro sec) a. Less than 45 degrees b. Greater than 45 degrees c. 45 degrees d. Unknown: more information is required
a
22. Rayleigh waves are influenced most by defects located: a. Close to or on the surface b. 1 wavelength below the surface c. 3 wavelengths below the surface d. 6 wavelengths below the surface
a
24. Lamb waves can be used to detect: a. Laminar-type defects near the surface of a thin material b. Lack of fusion in the center of a thick weldment c. Internal voids in diffusion bonds d. Thickness changes in heavy plate material
a
27. In an immersion test of a piece of steel or aluminum, the water distance appears on the display as a fairly wide space between the initial pulse and the front surface reflection because of: a. Reduced velocity of sound in water as compared to test specimen b. Increased velocity of sound in water as compared to test specimen c. Temperature of the water d. All of the above
a
33. During straight beam testing, test specimens with non-parallel front and back surfaces can cause: a. Partial or total loss of back reflection b. No loss in back reflection c. A widened (broad) back reflection indication d. A focused (narrow) back reflection indication
a
44. In an automatic scanning immersion unit, the bridge or carriage serves to: a. Support the manipulator and scanner tube and to move it about transversely and longitudinally b. Control the angular and transverse positioning of the scanner tube c. Control the vertical and angular positioning of the scanner tube d. Raise and lower the transducer
a
45. When adjusting the flaw locating rule for a shear wave weld inspection, the zero point on the rule must coincide with the: a. Sound beam exit point of the wedge b. Point directly over the flaw c. Wheel search unit d. Circular scanner
a
48. A primary purpose of a reference standard is: a. To provide a guide for adjusting instrument controls to reveal discontinuities that are considered harmful to the end use of the product b. To give the technician a tool for determining exact discontinuity size c. To provide assurance that all discontinuities smaller than a certain specified reference reflector are capable of being detected by the test d. To provide a standard reflector which exactly simulates natural discontinuities of a critical size
a
53. Gas discontinuities are reduced to flat discs or other shapes parallel to the surface by: a. Rolling b. Machining c. Casting d. Welding
a
54. In which zone does the amplitude of an indication from a given discontinuity diminish exponentially as the distance increases? a. Far field zone b. Near field zone c. Dead zone d. Fresnal zone
a
64. The total energy losses occurring in all materials is called: a. Attenuation b. Scatter c. Beam spread d. Interface
a
75. Compute the wavelength of ultrasonic energy in lead at 1 MHz. Vl = 2.1 x 10exp5 cm/s Vel. = wavelength x frequency a. 0.21 cm b. 21 cm c. 0.48 cm d. 4.8 x 10exp-5 cm
a
78. Water travel distance for immersion inspections should be: a. Such that the second front reflection does not appear between the first front and back reflections b. Exactly 76mm (3in) c. Less than 76mm (3in) d. Always equal to the thickness of the material being inspected
a
79. The electronic circuitry that allows selection and processing of only those signals relating to discontinuities that occur in specific zones of a part is called: a. An electronic gate b. An electronic attenuator c. A distance amplitude correction circuit d. A fixed marker
a
88. The angle of reflection is: a. Equal to the angle of incidence b. Dependent on the couplant used c. Dependent on the frequency used d. Equal to the angle of refraction
a
91. In ultrasonic testing, the time duration of the transmitted pulse is referred to as: a. The pulse length or pulse width b. The pulse amplitude c. The pulse shape d. None of the above
a
93. The change in direction of an ultrasonic beam when it passes from one medium to another whose velocity differs from that of the first medium is called: a. Refraction b. Rarefaction c. Angulation d. Reflection
a
96. In general, shear waves are more sensitive to small discontinuities than longitudinal waves for a given frequency and in a given material because: a. The wavelength of shear waves is shorter than the wavelength of longitudinal waves b. Shear waves are not as easily dispersed in the material c. The direction of particle vibration for shear waves is more sensitive to discontinuities d. The wavelength of shear waves is longer than the wavelength of longitudinal waves
a
97. In general, which of the following modes of vibration would have the greatest penetrating power in a coarse-grained material if the frequency of the waves are the same? a. Longitudinal b. Shear c. Transverse d. All of the above modes would have the same penetrating power
a
98. A testing technique in which the crystal or transducer is parallel to the test surface and ultrasonic waves enter the material being testing in a direction perpendicular to the test surface is: a. Straight beam testing b. Angle beam testing c. Surface wave testing d. None of the above
a
102. The transducers most commonly found in ultrasonic search units (probes) used for discontinuity testing utilize: a. Magnetostriction principles b. Piezoelectric principles c. Mode conversion principles d. None of the above
b
109. The product of the sound velocity and the density of a material is known as the: a. Refraction value of the material b. Acoustic impedance of the material c. Elastic constant of the material d. Poisson's ratio of the material
b
110. The amplifier range over which the unsaturated signal response increases in amplitude in proportion to the discontinuity surface area is the: a. Sensitivity range b. Vertical linearity range c. Selectivity range d. Horizontal linearity range
b
118. Significant errors in ultrasonic thickness measurement can occur if: a. The test frequency is varying at a constant rate b. The velocity of propagation deviates substantially from an assumed constant value for a given material c. Water is employed as a couplant between the transducer and the part being measured d. None of the above should cause errors
b
12. It is possible for a discontinuity smaller than the transducer to produce indications of fluctuating amplitude as the search unit is moved laterally if testing is being performed in the: a. Fraunhofer zone b. Near field c. Snell field d. Shadow zone
b
120. An ultrasonic testing instrument that displays pulses representing the magnitude of reflected ultrasound as a function of time or depth of metal is said to contain: a. A continuous wave display b. An A-scan presentation c. A B-scan presentation d. A C-scan presentation
b
127. In a basic pulse echo ultrasonic instrument, the component that produces visible signals on the CRT which are used to measure distance is called a: a. Sweep circuit b. Marker circuit c. Receiver circuit d. Synchronizer
b
128. Most basic pulse echo ultrasonic instruments use: a. Automatic read-out equipment b. An A-scan presentation c. A B-scan presentation d. A C-scan presentation
b
130. The incident angles at which 90 degree refraction of longitudinal and shear waves occurs are called: a. The normal angles of incidence b. The critical angles c. The angles of maximum reflection d. None of the above
b
133. The motion of particles in a shear wave is: a. Parallel to the direction of propagation of the ultrasonic beam b. Transverse to the direction of beam propagation c. Limited to the material surface and elliptical in motion d. Polarized in a plane at 45 degrees to the direction of beam propagation
b
135. The refraction angle of longitudinal ultrasonic waves passing from water into a metallic material at angles other than normal to the interface is primarily a function of: a. The impedance ratio (r=ZwZm) of water to metal b. The relative velocities of sound in water and metal c. The frequency of the ultrasonic beam d. The density ratio of water to metal
b
143. The acoustic impedance is: a. Used to calculate the angle of reflection b. The product of the density of the material and the velocity of sound in the material c. Found by Snell's law d. Used to determine resonance values
b
144. Thin sheet may be inspected with the ultrasonic wave directed normal to the surface by observing: a. The amplitude of the front surface reflection b. The multiple reflection pattern c. All front surface reflections d. None of the above
b
147. A discontinuity that occurs during the casting of molten metal which may be caused by the splashing, surging, interrupted pouring, or the meeting of two streams of metal coming from different directions is called: a. A burst b. A cold shut c. Flaking d. A blow hole
b
15. In the far field of a uniform ultrasonic beam, sound intensity is ______________ the beam centerline. a. Minimum at b. Maximum at c. Maximum throughout twice the angle (sin sigma = C/Df) where C is acoustic velocity, D is crystal diameter, and f is frequency at d. Not related to orientation of
b
153. A quartz crystal cut so that its major faces are parallel to the Z and Y axes and perpendicular to the X axis is called: a. A Y-cut crystal b. An X-cut crystal c. A Z-cut crystal d. A ZY-cut crystal
b
161. The wavelength of an ultrasonic wave is: a. Directly proportional to velocity and frequency b. Directly proportional to velocity and inversely proportional to frequency c. Inversely proportional to velocity and directly proportional to frequency d. Equal to the product of velocity and frequency
b
164. Inspection of castings is often impractical because of: a. Extremely small grain structure b. Coarse grain structure c. Uniform flow lines d. Uniform velocity of sound
b
167. The resolving power of a search unit is directly proportional to its: a. Diameter b. Bandwidth c. Pulse repetition d. None of the above
b
17. Where does beam divergence occur? a. Near field b. Far field c. At the crystal d. None of the above
b
170. The primary requirement of a paintbrush transducer is that: a. All crystals be mounted equidistant from each other b. The intensity of the beam pattern not vary greatly over the entire length of the transducer c. The fundamental frequency of the crystals not vary more than 0.01% d. The overall length not exceed 76mm (3in)
b
172. Since the velocity of sound in aluminum is approximately 245,000 in/s, it takes how long for sound to travel through 25mm (1in) of aluminum? a. 1/8 s b. 4 micro sec. c. 4 milli sec. d. 1/4 x 10exp4 sec
b
176. In an A-scan presentation, the horizontal line formed by the uniform and repeated movement of an electron beam across the fluorescent screen of a cathode ray tube is called: a. A square wave pattern b. A sweep line c. A marker pattern d. None of the above
b
178. In general, which waves will travel around gradual curves with little or no reflection from the curve? a. Transverse waves b. Surface waves c. Shear waves d. Longitudinal waves
b
180. An ultrasonic instrument has been calibrated to obtain a 51mm (2in) indication from a 2mm (0.08in) diameter flat bottom hole located 76mm (3in) from the front surface of an aluminum reference block. When testing an aluminum forging, a 51mm (2in) indication is obtained from a discontinuity located 76mm (3in) from the entry surface. The cross sectional area of this discontinuity is probably: a. The same as the area of the 2mm (0.08in) flat bottom hole b. Greater than the area of the 2mm (0.08in) flat bottom hole c. Slightly less than the area of the 2mm (0.08in) flat bottom hole d. About 1/2 the area of the 2mm (0.08in) flat bottom hole
b
183. When using two separate search units (one a transmitter, the other a receiver), the most efficient combination would be a: a. Quartz transmitter and a barium titanate receiver b. Barium titanate transmitter and a lithium sulfate receiver c. Lithium sulfate transmitter and a barium titanate receiver d. Barium titanate transmitter and a quartz receiver
b
185. In general, discontinuities in wrought products tend to be oriented: a. Randomly b. In the direction of the grain flow c. At right angles to the entry surface d. At right angles to the grain flow
b
188. In cases where the diameter of tubing being inspected is smaller than the diameter of the transducer, what can be used to confine the sound beam to the proper range of angles? a. A scrubber b. A collimator c. An angle plane angulator d. A jet-stream unit
b
191. The property of certain materials to transform electrical energy to mechanical energy and vice versa is called: a. Mode conversion b. Piezoelectric effect c. Refraction d. Impedance matching
b
193. To prevent the appearance of the second front surface indication before the first back reflection when inspecting aluminum by the immersion method (water is used as a couplant), it is necessary to have a minimum of at least 1 inch of water for every: a. 51mm (2in) of aluminum b. 102mm (4in) of aluminum c. 152mm (6in) of aluminum d. 203mm (8in) of aluminum
b
196. A discontinuity with a concave surface will: a. Diffuse the sound energy throughout the part b. Cause the reflected beam to focus at a point c. Cause mode reinforcement of the ultrasonic wave d. None of the above
b
197. Rayleigh waves: a. Are generated at the first critical angle b. Are generated at the second critical angle c. Are generated at either critical angle d. Travel only in a liquid e. Are another name for Lamb waves
b
25. The ratio of the velocity of sound in water compared to that for aluminum or steel is approximately: a. 1:8 b. 1:4 c. 1:3 d. 1:2
b
29. What law can be used to calculate the angle of refraction within a metal for both longitudinal and shear waves? a. Poisson's ratio law b. Snell's law c. Fresnel's field law d. Charles' law
b
3. The only significant sound wave mode that will travel through a liquid is: a. Shear b. Longitudinal c. Surface d. Rayleigh
b
34. In the immersion technique, the distance between the face of the transducer and the test surface (water path) is usually adjusted so that the time required to send the sound beam through the water: a. Is equal to the time required for the sound to travel through the test piece b. Is greater than the time required for the sound to travel through the test piece c. Is less than the time required for the sound to travel through the test piece? d. None of the above
b
35. In a B-scan display, the length of a screen indication from a discontinuity is related to: a. A discontinuity's thickness as measured parallel to the ultrasonic beam b. The discontinuity's length in the direction of the transducer travel c. Both a and b d. None of the above
b
47. Which best describes a typical display of a crack whose major surface is perpendicular to the ultrasonic beam? a. A broad indication b. A sharp indication c. The indication will not show due to improper orientation d. A broad indication with high amplitude
b
52. A discontinuity is located having an orientation such that its long axis is parallel to the sound beam. The indication from such a discontinuity will be: a. Large in proportion to the length of the discontinuity b. Small in proportion to the length of the discontinuity c. Representative of the length of the discontinuity d. Such that complete loss of back reflection will result
b
56. Using a pulse echo technique, if the major plane of a flat discontinuity is oriented at some angle other than perpendicular to the direction of sound propagation, the result may be: a. Loss of signal linearity b. Loss or lack of a received discontinuity echo c. Focusing of the sound beam d. Loss of interference phenomena
b
58. A set of standard reference blocks with the same geometrical configuration and dimensions other than the size of the calibration reflectors, e.g., flat bottom holes, is called a set of: a. Distance amplitude standards b. Area amplitude standards c. Variable frequency blocks d. Beam spread measuring blocks
b
59. The angle at which 90 degree refraction of a longitudinal sound wave is reached is called: a. The angle of incidence b. The first critical angle c. The angle of maximum reflection d. The second critical angle
b
66. Acoustical lenses are commonly used for contour correction. When scanning the inside of a pipe section by the immersion method, which of the following lens types would be used? a. Focused cup b. Convex c. Concave d. Variable pitch
b
70. When the incident angle is chosen to be between the first and second critical angles, the ultrasonic wave generated within the part will be: a. Longitudinal b. Shear c. Surface d. Lamb
b
71. In Figure 4, transducer B is being used to check: a. Verification of wedge angle b. Resolution c. Sensitivity calibration d. Distance calibration
b
72. The angle at which 90 degree refraction of the shear wave mode occurs is called the: a. First critical angle b. Second critical angle c. Third critical angle d. Angle of reflection
b
74. If you were requested to design a plastic shoe to generate a Rayleigh wave in aluminum, what would be the incident angle of the ultrasonic energy? Va = 3.1 x 10exp5 cm/s Vp = 2.6 x 10exp5 cm/s (Trigonometry Tables Required) a. 37 degrees b. 57 degrees c. 75 degrees d. 48 degrees
b
77. For aluminum and steel, the longitudinal velocity is approximately _____________ the shear velocity. a. Equal to b. Twice c. Half of d. Four times
b
8. The crystal thickness and transducer frequency are related. The thinner the crystal: a. The lower the frequency b. The higher the frequency c. There is no appreciable affect d. None of the above
b
81. In inspecting a 102mm (4in) diameter threaded steel cylinder for radial cracks extending from the root of the threads, it would be preferable to transmit: a. Shear waves at an angle to the threads b. Longitudinal waves from the end of the cylinder c. Surface waves perpendicular to the thread roots d. Shear waves around the circumference of the cylinder
b
83. The angle formed by an ultrasonic wave as it enters a medium of different velocity than the one from which it came and a line drawn perpendicular to the interface between the two media is called the angle of: a. Incidence b. Refraction c. Rarefaction d. Reflection
b
86. A grouping of a number of crystals in one search unit, with all contact surfaces in the same plane, and vibrating in phase with each other to act as a single transducer is called a: a. Focusing crystal b. Crystal mosaic c. Scrubber d. Single plane manipulator
b
87. The scattering of the rays of an ultrasonic beam due to reflection from a highly irregular surface is called: a. Angulation b. Dispersion c. Refraction d. Rarefaction
b
99. The distance from a given point on an ultrasonic wave to the next corresponding point is referred to as: a. Frequency b. Wavelength c. Velocity d. Pulse length
b
30. At an interface between two different materials, an impedance difference results in: a. Reflection of the entire incident energy at the interface b. Absorption of sound c. Division of sound energy into transmitted and reflected modes d. None of the above
c
36. Which circuit triggers the pulser and sweep circuits in an A-scan display? a. Receiver-amplifier b. Power supply c. Clock d. Damping
c
37. On an A-scan display, the "dead zone", refers to: a. The distance contained within the near field b. The area outside the beam spread c. The distance covered by the front surface pulse width and recovery time d. The area between the near field and the far field
c
39. Of the following scan types, which one can be used to produce a recording of flaw areas superimposed over a plan view of the test piece? a. A-scan b. B-scan c. C-scan d. D-scan
c
4. The acoustic impedance of a material is used to determine the: a. Angle of refraction at an interface b. Attenuation within the material c. Relative amounts of sound energy coupled through and reflected at an interface d. Beam spread within the material
c
43. A 15cm (6in) diameter rod is being inspected for centerline cracks. The A-scan presentation for one complete path through the rod is as shown in Figure 2. Where should there be an alarm gate? a. An alarm gate should be used between points A and E b. An alarm gate should be used at point D only c. An alarm gate should be used between points B and D d. An alarm gate could not be used for this application
c
46. A special scanning device with the transducer mounted in a tire-like container filled with couplant is commonly called: a. A rotating scanner b. An axial scanner c. A wheel transducer d. A circular scanner
c
49. Compensation for the variation in echo height related to variations in discontinuity depth in the test material is known as: a. Transfer b. Attenuation c. Distance amplitude correction d. Interpretation
c
5. When angle beam contact testing a test piece, increasing the incident angle until the second critical angle is reached results in: a. Total reflection of a surface wave b. 45 degree refraction of the shear wave c. Production of a surface wave d. None of the above
c
50. Which of the following is a reference reflector that is not dependent on beam angle? a. A flat bottom hole b. A vee notch c. A side drilled hole which is parallel to the plate surface and perpendicular to the sound path d. A disc-shaped laminar reflector
c
57. As transducer diameter decreases, the beam spread: a. Decreases b. Remains the same c. Increases d. Becomes conical in shape
c
60. Which of the following controls the voltage supplied to the vertical deflection plates of the CRT in an A-scan setup? a. Sweep generator b. Pulser c. Amplifier circuit d. Clock timer
c
62. The vertical linear range of a test instrument may be determined by obtaining ultrasonic responses from: a. A set of distance amplitude reference blocks b. Steel balls located at several different water path distances c. A set of area amplitude reference blocks d. All of the above
c
65. Delay-tip (stand-off) type contact search units are primarily used for: a. Defect detection b. Sound wave characterization c. Thickness measurement or flaw detection in thin material d. Attenuation measurements
c
68. In Figure 3, transducer C is being used to check: a. Distance calibration b. Resolution c. Sensitivity calibration d. Verification of wedge angle
c
73. In a water immersion test, ultrasonic energy is transmitted into steel at an incident angle of 14 degrees. What is the angle of the refracted shear wave within the material? Vs = 3.2 x 10exp5 cm/s Vw = 1.5 x 10exp5 cm/s (Trigonometry Tables Required) a. 45 degrees b. 23 degrees c. 31 degrees d. 13 degrees
c
80. When conducting a contact ultrasonic test, the "hash" or irregular signals that appear in the CRT display of the area being inspected could be caused by: a. Fine grains in the structure b. Dirt in the water couplant c. Coarse grains in the structure d. A thick but tapered back surface
c
82. In an immersion inspection of raw material, the water travel distance should be: a. Exactly 76mm (3in) b. Equal to 76mm (3in) + or - 13mm (+ or - 0.5in) c. Equal to the water travel distance used in setting up on the reference standards d. Equal to the thickness of a material
c
85. An electron tube in which a beam of electrons from the cathode is used to reproduce an image on a fluorescent screen at the end of the tube is referred to as: a. An amplifier tube b. A pulser tube c. A cathode ray tube d. A sweep tube
c
89. The angular position of the reflecting surface of a planar discontinuity with respect to the entry surface is referred to as: a. The angle of incidence b. The angle of refraction c. The orientation of the discontinuity d. None of the above
c
94. The coated inside surface of the large end of a cathode ray tube which becomes luminous when struck by an electron beam is called: a. An electron gun b. An electron amplifier c. A CRT screen d. An electron counter
c
182. Low frequency sound waves are not generally used to test thin materials because of: a. The rapid attenuation of low frequency sound b. Incompatible wavelengths c. Poor near-surface resolution d. None of the above will actually limit such a test
c
187. In contact testing, defects near the entry surface cannot always be detected because of: a. The far-field effect b. Attenuation c. The dead zone d. Refraction
c
189. The maximum scanning speed possible is primarily determined by: a. The frequency of the search unit b. Viscous drag problems c. The pulse repetition rate of the test instrument d. The persistency of the CRT screen
c
190. Which of the following is frequently displayed by a facsimile recording instead of a CRT presentation? a. A-scan presentation b. B-scan presentation c. C-scan presentation d. None of the above are adaptable for facsimile recordings
c
192. Surface waves are reduced to an energy level of approximately 1/25 of the original power at a depth of: a. 25mm (1in) b. 102mm (4in) c. 1 wavelength d. 4 wavelengths
c
198. Angle beam testing of plate will often miss: a. Cracks that are perpendicular to the sound wave b. Inclusions that are randomly oriented c. Laminations that are parallel to the front surface d. A series of small discontinuities
c
20. When examining materials for planar flaws oriented parallel to the part surface, what testing method is most often used? a. Angle beam b. Through-transmission c. Straight beam d. Dual crystal
c
203. Attenuation is the loss of ultrasonic wave energy during the course of propagation in the material due to: a. Reflection and refraction b. Dispersion and diffraction c. Absorption and scattering d. Composition and shape e. All of the above
c
200. In a plate, skip distance can be calculated from which of the following formulas where (t= plate thickness, theta = angle of sound beam refraction, and V = sound velocity): a. S = (2 x t) / tan theta b. S= 2 x t x sin theta c. S = 2 x t x tan theta d. S = 2 x V x sin theta e. None of the above
c
23. The ultrasonic test method in which finger damping is most effective in locating a discontinuity is: a. Shear wave b. Longitudinal wave c. Surface wave d. Compression wave
c
122. In a liquid medium, the only mode of vibration that can exist is: a. Longitudinal b. Shear c. Both a and b d. Surface
a
126. In a basic pulse echo ultrasonic instrument, the component that produces the time base line is called a: a. Sweep circuit b. Receiver c. Pulser d. Synchronizer
a
131. Compression waves whose particle displacement is parallel to the direction of propagation are called: a. Longitudinal waves b. Shear waves c. Lamb waves d. Rayleigh waves
a
134. An ultrasonic longitudinal wave travels in aluminum with a velocity of 635,000 cm/s and has a frequency of 1 MHz. The wavelength of this ultrasonic wave is: a. 6.35mm (0.25in) b. 78mm (3.1in) c. 1.9m (6.35 ft) d. 30,000A
a
137. As frequency increases in ultrasonic testing, the angle of beam divergence of a given diameter crystal: a. Decreases b. Remains unchanged c. Increases d. Varies uniformly through each wavelength
a
139. In which medium listed below would the velocity of sound be lowest? a. Air b. Water c. Aluminum d. Plastic
a
140. A longitudinal ultrasonic wave is transmitted from water into steel at an angle of 5 degrees from the normal. In such a case, the refracted angle of the transverse wave is: a. Less than the refracted angle of the longitudinal wave b. Equal to the refracted angle of the longitudinal wave c. Greater than the refracted angle of the longitudinal wave d. Not present at all
a
142. In steel, the velocity of sound is greatest in which of the following modes of vibration? a. Longitudinal b. Shear c. Surface wave d. Sound velocity is identical in all modes, in a given material
a
151. A point, line, or surface of a vibrating body marked by absolute or relative freedom from vibratory motion is referred to as: a. A node b. An antinode c. Rarefaction d. Compression
a
177. Which of the following frequencies would probably result in the greatest amount of attenuation losses? a. 1 MHz b. 2.25 MHz c. 5 MHz d. 10 MHz
d
156. When inspecting aluminum by the immersion method using water for a couplant, the following information is known: Velocity of sound in water = 1.49x10exp5 cm/s, Velocity of longitudinal waves in aluminum = 6.32x10exp5 cm/s, and angle of incidence = 5 degrees The angle of refraction for longitudinal waves is approximately: a. 22 degrees b. 18 degrees c. 26 degrees d. 16 degrees
a
158. Of the piezoelectric materials listed below, the most efficient sound receiver is: a. Lithium sulfate b. Quartz c. Barium titillate d. Silver oxide
a
160. Beam divergence is a function of the dimensions of the crystal and the wavelength of the beam transmitted through a medium, and it: a. Increases if the frequency or crystal diameter is decreased b. Decreases if the frequency or crystal diameter is decreased c. Increases if the frequency is increased and crystal diameter is decreased d. Decreases if the frequency is increased and crystal diameter is decreased
a
168. Acoustic lens elements with which of the following permit focusing the sound energy to enter cylindrical surfaces normally or along a line of focus? a. Cylindrical curvatures b. Spherical lens curvatures c. Convex shapes d. Concave shapes
a
171. Heat conduction, viscous friction, elastic hysteresis, and scattering are four different mechanisms which lead to: a. Attenuation b. Refraction c. Beam spreading d. Saturation
a
100. The speed with which ultrasonic waves travel through a material is known as its: a. Velocity b. Pulse repetition rate c. Pulse recovery rate d. Ultrasonic response
a
105. The formula (sin theta 1/V1) = (sin theta 2/V2) is used to determine: a. Angular relationships b. Phase velocities c. Amount of reflected sound energy d. Acoustic impedance
a
111. When inspecting a rolled or forged surface with a thin scale that is generally tightly adhering to the part, what is necessary to do before testing the part? a. Clean the surface of loose scale b. Have all scale removed c. Rough machine the surface d. Caustic etch the surface
a
113. What kind of waves travel at a velocity slightly less than shear waves and their mode of propagation is both longitudinal and transverse with respect to the surface? a. Rayleigh waves b. Transverse waves c. L-waves d. Longitudinal waves
a
114. Which ultrasonic test frequency would probably provide the best penetration in a 30cm 12in) thick specimen of coarse-grained steel? a. 1 MHz b. 2.25 MHz c. 5 MHz d. 10 MHz
a
116. Properties of shear or transverse waves used for ultrasonic testing include: a. Particle motion normal to propagation direction, and a propagation velocity which is about 1/2 the longitudinal wave velocity in the same material b. Exceptionally high sensitivity due to low attenuation resulting from longer wavelengths when propagating through water c. High coupling efficiency because shear waves are less sensitive to surface variables when traveling from a coupling liquid to the part d. None of the above statements apply to shear waves
a
117. One of the most common applications of ultrasonic tests employing shear waves is: a. Detection of discontinuities in welds, tube, and pipe b. Determination of elastic properties of metallic products c. Detection of laminar discontinuities in heavy plate d. Measurement of thickness of thin plate
a
121. At a water-to-steel interface the angle of incidence in water is 7 degrees. The principal mode of vibration that exists in the steel is: a. Longitudinal b. Shear c. Both a and b d. Surface
a
101. A substance that reduces the surface tension of a liquid is referred to as: a. A couplant b. An ultrasonic dampener c. A wetting agent d. None of the above
c
103. Mechanical and electrical stability, insolubility in liquids, and resistance to aging are three advantages of search units containing transducers made of: a. Lithium sulfate b. Barium titanate c. Quartz d. Rochelle salts
c
107. If an ultrasonic wave is transmitted through an interface of two materials in which the first material has a higher acoustic impedance value but the same velocity value as the second material, the angle of refraction will be: a. Greater than the angle of incidence b. Less than the angle of incidence c. The same as the angle of incidence d. Beyond the critical angle
c
112. The angle of reflection of an ultrasonic beam at an aluminum-water interface is: a. 0.256 times the angle of incidence b. Approximately 1/2 the angle of incidence c. Equal to the angle of incidence d. Approximately 4 times the angle of incidence
c
115. During immersion testing of an ASTM Ultrasonic Standard Reference Block, a B-scan presentation system will show a: a. "plan" view of the block, showing the area and position of the hole bottom as seen from the entry surface b. Basic test pattern showing the height of indication from the hold bottom and its location in depth from the entry surface c. Cross-section of the reference block, showing the top and bottom surfaces of the block and the location of the hole bottom in the block d. None of the above
c
125. In a basic pulse echo ultrasonic instrument, the component that produces the voltage that activates the search unit is called: a. An amplifier b. A receiver c. A pulser d. A synchronizer
c
13. In immersion testing, the near field effects of a transducer may be eliminated by: a. Increasing transducer frequency b. Using a larger diameter transducer c. Using an appropriate water path d. Using a focused transducer
c
138. Which of the following is not an advantage of contact ultrasonic search units (probes) adapted with Lucite shoes? a. Eliminates most of the crystal wear b. Permits adaptation to curved surfaces c. Increases sensitivity d. Allows ultrasound to enter a part's surface at oblique angles
c
14. In Figure 1, assuming a uniform beam pattern, what relationship would you expect to exist between the amplitudes of the reflected laminar signals at positions A and B? a. 12 dB difference b. Equal amplitudes c. 2 to 1 d. 3 to 1
c
141. The velocity of longitudinal waves will be highest in: a. Water b. Air c. Aluminum d. Plastic
c
145. A diagram in which the entire circuit stage or sections are shown by geometric figures and the path of the signal or energy by lines and/or arrows is called a: a. Schematic diagram b. Blueprint c. Block diagram d. None of the above
c
149. The expansion and contraction of a magnetic material under the influence of a changing magnetic field is referred to as: a. Piezoelectricity b. Refraction c. Magnetostriction d. Rarefaction
c
150. The ratio of stress to strain in a material within the elastic limit is called: a. Young's modulus b. The modulus of elasticity c. Both a and b d. The index of refraction
c
154. The equation describing wavelength in terms of velocity and frequency is: a. Wavelength = velocity x frequency b. Wavelength = z (frequency x velocity) c. Wavelength = velocity/frequency d. Wavelength = frequency + velocity
c
157. Of the piezoelectric materials listed below, the most efficient sound transmitter is: a. Lithium sulfate b. Quartz c. Barium titanate d. Silver oxide
c
16. Which of the following may result in a long narrow rod if the beam divergence results in a reflection from a side of the test piece before the sound wave reaches the back surface? a. Multiple indications before the first back reflection b. Indications from multiple surface reflections c. Conversion from the longitudinal mode to shear mode d. Loss of front surface indications
c
162. The fundamental frequency of a piezoelectric crystal is primarily a function of: a. The length of the applied voltage pulse b. The amplifying characteristics of the pulse amplifier in the instrument c. The thickness of the crystal d. None of the above
c
163. Acoustic velocities of materials are primarily due to the material's: a. Density b. Elasticity c. Both a and b d. Acoustic impedance
c
169. In the basic pulse echo instrument, the synchronizer, clock, or timer circuit will determine the: a. Pulse length b. Gain c. Pulse repetition rate d. Sweep length
c
184. In immersion testing, the accessory equipment to which the search cable and the search unit are attached is called a: a. Crystal collimator b. Scrubber c. Jet-stream unit d. Search tube or scanning tube
d
1. Of the following sound wave modes, which one has multiple or varying wave velocities? a. Longitudinal waves b. Shear waves c. Transverse waves d. Lamb waves
d
10. The length of the zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly affected by: a. The frequency of the transducer b. The diameter of the transducer c. The length of transducer cable d. Both a and b
d
104. The formula (sin theta 1/V1) = (sin theta 2/V2) is referred to as: a. The acoustical impedance ratio formula b. The phase conversion formula c. The Fresnal zone formula d. Snell's law
d
106. The amount of energy reflected from a discontinuity will be dependent on: a. The size of the discontinuity b. The orientation of the discontinuity c. The type of the discontinuity d. All of the above
d
108. Which of the following frequencies would probably result in the greatest ultrasonic attenuation losses? a. 1 MHz b. 2.25 MHz c. 10 MHz d. 25 MHz
d
11. The differences in signals received from identical reflectors at different material distances from a transducer may be caused by: a. Material attenuation b. Beam divergence c. Near field effects d. All of the above
d
119. Generally, the best ultrasonic testing method for detecting discontinuities oriented along the fusion zone in a welded plate is: a. An angle beam contact method using surface waves b. A contact test using a straight longitudinal wave c. An immersion test using surface waves d. An angle beam method using shear waves
d
123. In an ultrasonic instrument, the number of pulses produced by an instrument in a given period of time is known as the: a. Pulse length of the instrument b. Pulse recovery time c. Frequency d. Pulse repetition rate
d
124. In a basic pulse echo ultrasonic instrument, the component that coordinates the action and timing of other components is called a: a. Display unit or CRT b. Receiver c. Marker circuit or range marker circuit d. Synchronizer, clock, or timer
d
129. The cathode ray tube screen will display a plan view of the part outline and defects when using: a. Automatic read-out equipment b. An A-scan presentation c. A B-scan presentation d. A C-scan presentation
d
132. Which of the following modes of vibration are quickly damped out when testing by the immersion method? a. Longitudinal waves b. Shear waves c. Transverse waves d. Surface waves
d
136. In contact testing, shear waves can be induced in the test material by: a. Lacing an X-cut crystal directly on the surface of the materials, and coupling through a film of oil b. Using two transducers on opposite sides of the test specimen c. Placing a spherical acoustic lens on the face of the transducer d. Using a transducer mounted on a plastic wedge so that sound enters the part at an angle
d
146. A hole produced during the solidification of metal due to escaping gasses is called: a. A burst b. A cold shut c. Flaking d. A blow hole
d
148. The ratio between the wave speed in one material and the wave speed in a second material is called: a. The acoustic impedance of the interface b. Young's Modulus c. Poisson's ratio d. The index of refraction
d
152. The factor which determines the amount of reflection at the interface of two dissimilar materials is: a. The index of rarefaction b. The frequency of the ultrasonic wave c. Young's modulus d. The acoustic impedance
d
155. Which of the following can occur when an ultrasonic beam reaches the interface of two dissimilar materials: a. Reflection b. Refraction c. Mode conversion d. All of the above
d
159. The most commonly used method of producing shear waves in a test part when inspecting by the immersion method is: a. By transmitting longitudinal waves into a part in a direction perpendicular to its front surface b. By using two crystals vibrating at different frequencies c. By using a Y-cut quartz crystal d. By angulating the search tube to the proper angle
d
165. Lamb waves may be used to inspect: a. Forging b. Bar stock c. Ingots d. Thin sheet
d
166. The formula used to determine the angle of beam divergence of a quartz crystal is: a. Sin theta = diameter 1/2 x wavelength b. Sin theta diameter = frequency x wavelength c. Sin theta = frequency x wavelength d. Sin theta/2 = 1.22 x wavelength/diameter
d
174. Reflection indications from a weld area being inspected by the angle beam technique may represent: a. Porosity b. Cracks c. Weld bead d. All of the above
d
175. During a test using A-scan equipment, strong indications that move at varying rates across the screen in the horizontal direction appear. It is impossible to repeat a particular screen pattern by scanning the same area. A possible cause of these indications is: a. Porosity in the test part b. An irregularly shaped crack c. A blow hole d. Electrical interference
d
