QUIZ) ASNT L3 UT 4

61. A broad-based indication that tends to be consistent, as the search unit is moved along a contoured

surface could indicate

A. the porosity

B. large grain structure

C. an intermitent crack

D. a false indication

62. Which of the methods listed below would give the best ultrasonic response to typics found in

large rectangular aluminum or steel ingots? (at normal temperature)

A. contact method using refracted longitudinal waves

B. Squirter of bubbler method using compressional waves

C. Dual transducer angle beam method using shear waves

D. EMATS method using angle directed meandering coils

63. When frequency if decreased, the near field of a transducer

A. decreases

B. increases

C. stays the same

D. becomes truncated

64. It is important that reference block material

A. have the same of similar sound attenuation, sound velocity, and acoustical impedance as that of the

test specimen

B. have the same or similar sound attenuation, sound velocity and thickness as that of the test specimen

C. have the same or similar sound attenuation, sound velocity and material grain structures as that of the

test specimen

D. have the same or similar sound attenuation, sound velocity and geometry as that of the test specimen

65. The ratio of areas between a 1/64 inch diameter and an 8/64 inch diameter flat-bottomed hole is

A. 1:8

B. 1:16

C. 1:32

D. 1:64

66. Which of the following is checked by displaying two signals on the CRT, one which 50% of the other,

then decreasing the instrument gain in 2dB increments while verifying that a 2 to 1 relationship is maintained?

A. Vertical linearity

B. Sensitivity

C. Horizontal linearity

D. Amplitude control linearity

67. When carrying out a weld examination using an ultrasonic system with digital signal processors.

signal can be evaluated using which of the following?

A. Radiofrequency amplifiers

B. Bandwidth detectors

C. Frequency spectrum analysis

D. an analog to digital converter

68. In examination of a butt weld in a steel plate with an angle transduce requires that

A. the thickness of the plate is known

B. acoustic impedance of the material be known

C. velocity of the transducer couplant be known

D. transducer material be known

69. Discontinuities that may occur during hot reduction of the ingot or billet include which ………

A. Porosity

B. Stress cracks

C. Ferrite stringers

D. Lack of fusion

70. It is required to inspect a butt weld in a one inch thick steel plate with a 60 degree angle beam transducer.

To provide full volume inspection, the required scanning distance from the weld toe should be

A. 0.85 to 1.7 inches

B. 1.0 to 2.0 inches

C. 1.7 to 3.5 inches

D. 2.0 to 4.0 inches

71. Which of the following techniques would least likely be used for liquid level sensing a gasoline tank

three feet in diameter and four feet high?

A. Pulse-echo shear waves transmitted from a transducer mounted on the bottom, through the gasoline,

to the top of the liquid

B. Disturbance at the air/liquid interface of surface wave propagation down a "dipstick" containing

calibration notches at specific distances from the transducer

C. Pulse-echo compressional waves from a transducer mounted on the tank bottom, propagating to the

to of the liquid

D. Transmitting compressional waves across the tank diameter and monitoring for presence or absence

of a reflection from the opposite wall

72. Internal burst(s) detected by ultrasonic inspection through the end face(longitudinal or by shear wave

inspection through side of an extrusion) would be classified as a

A. lap

B. chevron

C. seam

D. lamination

73. An important when using the distance gain size(DGS) diagrams for calibration and evaluation is that

the ultrasonic instrument

A. have a square wave pulser

B. have the DGS table built into the software

C. have a logarithmic amplifier

D. have gain controls calibrated in decibels

74. A type of oscilloscope display in ultrasonic testing that shows frequency shifts would probably be a part

of what type of equipment?

A. Pulse-echo

B. Resonance

C. Through-transmission

D. Time-of-Flight thickness measurement

75. Wheel transducers are most commonly used to good advantage in

A. through-transmission of irregular shaped parts

B. A focusing Application at various shear angles

C. the manipulation of two or more squirter units

D. the inspection of thin sheet for laminations

76. Maximum reflection of sound occurs when the thickness of the reflector is a minimum of

A. three-quarter wavelength

B. one-quarter wavelength

C. one-half wavelength

D. one wavelength

77. Subsurface reflectors may be detected by Rayleigh waves

A. Only when inspection is performed on materials with velocities greater than 0.585 cm/microsec

B. even when used in the compressional mode

C. if they lie within one wavelength of the surface

D. if they lie within half wavelength of the surface

78. A 40 dB difference is equivalent to an amplitude ratio of

A. 20 to 1

B. 40 to 1

C. 80 to 1

D. 100 to 1

79. Which all test conditions held constant, the amplitude of the indication from an imperfection located

within the near field zone

A. will always be larger than the indication from the same size imperfection located in the far-field zone

B. will always be the same amplitude as that produced by the same size imperfection in the far-field zone

C. will always be smaller than the indication from the same size imperfection located in the far-field zone

D. may be larger, the same as, or smaller than the indication from the same size imperfection in the far

field zone

80. Within a given plate, the specific velocities for Lamb waves are complex functions of which of the following?

A. Longitudinal and transverse wave velocities

B. Plate thickness and frequency

C. Acoustic impedance ratio

D. Plate curvature

 

 

 

 

answer

61	62	63	64	65	66	67	68	69	70
B	A	A	B	D	A	D	A	B	C
71	72	73	74	75	76	77	78	79	80
A	B	D	B	A	B	C	D	D	B