QUIZ) ASNT L3 UT 3

41. Regardless of the material property being sought, the ultrasonic determinations are

A. velocity and attenuation

B. attenuation vs scatter

C. beam spread and velocity

D. velocity and scatter

42. An A-scan or B-scan presentation in which an initial part of the time scale is not displayed if called

A. distance amplitude correction

B. initial pulse

C. contact testing

D. delayed sweep

43. When comparing signal response from a notch to the same size drilled holes at the same distance,

using a 45 degree shear wave which of the following is true?

A. The signal amplitude from the side drilled hole grater than the notch

B. The signal amplitude from the side drilled hole less than the notch

C. The signal amplitude is identical in both cases

D. The signal amplitude from the notch is exactly 1/2 that from the side drilled hole

44. The display of misleading reflections from a previously transmitted pulse, caused by an excessively

high-pulse-repetition frequency is called

A. scattered energy absorptions

B. cross talk/gross coupling

C. electrical noise hash

D. warp around/ghosting

45. The display of an unrectification signal on the cathode ray tube(CRT) is called

A. Positive Half Wave(PHW)

B. negative Half Wave(NHW)

C. Full Wave(FW)

D. Radio Frequency(R-F)

46. In one technique for underwater thickness measurements for corrosion using a focused transducer

(focal spot above the material surface), as the transducer is scanned over the material surface, a shift

in the front surface indication(assume a constant water path)

A. indicates a discontinuity just below the material surface

B. indicates a non-paralled back surface

C. indicates a pitted surface

D. is due to a change in the water temperature

47. When testing a material with unknown a acoustic properties, a material velocity determination can be

made. The velocity determination can made by pulse-echo techniques and performing signal analysis

of the ultrasonic wave. This signal analysis can yield information regarding _________________________________

which are useful for determing precise velocity

A. group dispersion curves and phase velocity

B. group velocity and frequency dependent phase velocities

C. bulk microstructure velocity and group velocities

D. frequency spectra and group dispersion curves

48. Which of the following is as important as wavelength in the detection of a small flaw situated close to

the front surface of a flat plate?

A. Internal metallurgical structure

B. Beam spread

C. Pulse length

D. sensitivity

49. The fundamental frequency in a resonance test is determined to be 0.461 Mhz and the material is

steel. What is the thickness of the material?

A. 0.125 inch

B. 0.062 inch

C. 0.250 inch

D. 0.375 inch

50. To minimize beam spread, when developing a straight beam technique, which of the following

transducers should be selected?

A. 1.0 MHZ 3/8 inch diameter

B. 5.0 MHZ - 3/8 inch diameter

C. 2.25 MHZ 1 inch diameter

D. 5.0 MHZ - 1 inch diameter

51. What would be the ultrasonic response from a metallic inclusion that is bonded into a metal matrix material?

A. A considerable response would result from the refracted incident sound beam

B. It may reflect only a small fraction of the incident sound beam depending on the impedance

mismatch at its surface

C. The only factor that will influence the ultrasonic response is the impedance mismatch of the inclusion

and the parent material

D. It may reflect only a small fraction of the incident sound beam if the inclusion is not bonded to the

parent material

52. The echo signal from a rough titled discontinuity in a large plate section is typically recognized as

A. low in amplitude but narrow at the base

B. low in amplitude but broad at the base

C. low in amplitude with a sharp rise and fall

D. high in amplitude with narrow base

53. The focal length of a focused transducer is a function of

A. transducer frequency

B. lens radius of curvature

C. the characteristic Y。 + point

D. backing material impedance ratio

54. A four and one half(4-1/2) inch thick stainless steel plate(302 55) is inspected with a 2.25 MHZ, 1

inch diameter immersion transducer(focal distance 8 inches in water), water path is three(3) inches.

What is the effective focal length from the top surface of the plate?

A 0.66 inches

B. 1.32 inches

C. 2.64 inches

D. 1.98 inches

55. An ultrasonic procedure requires recording of signals 8 dB below reference. The reference level is

set at 82% full screen height. Where should the recording level be set?

A. 40%

B. 32.6%

C. 30.2%

D. 25.5%

56. In a typical composite, adhesively bonded structure where a laminated face sheet is bonded with

adhesive to a titanium spar, an adhesive debond condition can be determined by

A monitoring the front and back surface reflections of the bondline

B. identification of the return signals by knowing the layer thickness and sound velocity in the

composite and in the metal

C. viewing the reflected signal at the interface

D. assessing the elastic wave modes through the adhesive at the debond location

57. The notch type of examination of metal tubing may be

A. "V" notch

B. "U" notch

C. buttress notch or shot

D. as specified in code or standard

58. The 6 dB down sizing technique is quite accurate for discontinuities normal to the beam, but discontinuities

A. oblique to the beam are undersized

B. oblique to the beam are oversized

C. which are subsurface are undetected

D. which are longer than the beam should not be sized with this technique

59. Thin sheet may be inspected with the ultrasonic wave directed normal the the surface by observing

A. the amplitude of the front surface reflection

B. the multiple reflection pattern

C. all front surface reflections

D. the width of the first back reflection

60. Reference sensitivity was established for straight beam scanning by setting the back reflection from a

calibration plate to 70 percent screen height. When the transducer is placed on the test material this

signal drops to 14 percent screen height due to attenuation differences. What would be the DB

correction needed?

A. 8 dB

B. 10 dB

C. 12 dB

D. 14 dB

 

 

 

 

 

answer

41	42	43	44	45	46	47	48	49	50
C	D	B	D	D	C	B	D	C	D
51	52	53	54	55	56	57	58	59	60
C	B	B	B	B	D	D	A	B	D