QUIZ) ASNT L3 UT 5

81. An effective and commonly used technique for measuring the through wall depth of a discontinuity in

tubular products is

A. a narrow focus shear wave transducer/wedge combination

B. a highly dampened pitch-catch shear wave transducer/wedge combination

C. a tandom pitch-catch shear wave transducer/wedge combination

D. a multi-mode transducer/wedge shear/longitudinal transducer/wedge combination

82. Surface wave methods might be used for aluminum plate inspection in addition to longitudinal wave

testing methods because

A. of the favorable grain structure at the surface due to the rolling process

B. surface waves are especially sensitive to rolling induced discontinuities such as surface cracks and

other surface blemishes

C. of entry surface resolution

D. difficulty in coupling

83. Differences in performance between ultrasonic instruments and systems

A. may be compensated for by use of the specified reference standards

B. do not occur in modern equipment

C. can be compensated for by adjusting to maintain the same background noise level

D. seldom significantly affect the test results

84. You are inspection An overlay of a welded steel pipe which you suspect has a columnar grain

structure resulting from improper heat input and cooling during the welding process. What type of

possible problems would you expect to encounter during shear wave ultrasonic testing of this weld?

A. Inability to pass sound through the meterial at any frequency

B. Re-direction of the sound beam

C. Weld cracking at the root because of columnar structure

D. None. Columnar grain structures are not possible in welds, only in castings

85. The design "5-0300" on a distance amplitude reference block indicates that the block

A. is 5 inches long with a hole diameter of 3/16 inch

B. is 5 inches long with a hole diameter of 3/64 inch

C. has a metal distance to the hole of 5 inches with a hole diameter of 3/64 inch

D. has a metal distance to the hole of 3 inches with a hole diameter of 5/64 inch

86. Under high ambient light conditions, increasing the pulse repetition rate may improve the brightness

the "A" scan trace since the repetition rate control

A. provides more voltage to the horizontal deflection plates of the scope

B. increases the voltage of the pulser thus providing more power to the transducer

C. increases the number of sweep inputs to the amplifiers of the scope with more over tracing of the

same pattern of the CRT

D. automatically increases the accelerating voltage in the CRT

87. Which of the following modes of vibration will produce the shortest wavelength at a given frequency

and in a given material?

A. Thin rod wave

B. Compression wave

C. Shear wave

D. Surface wave

88. Personnel responsible for conducting ultrasonic tests should be

A. trained and highly qualified and have a thechnical understanding of test equipment material and procedure

B. trained to a higher level than quality assurance personnel

C. able to understand and test to most common ultrasonic codes and specifications

D. trained to ASNT/ANSI CP-189

89. Compact, digital-display thichness measurement instruments depend upon which of the following for

their operating principles

A. pulse-echo

B. through-transmission

C. resonance

D. immersion

90. Which of the following statements are true, when looking for a debonding condition between two

materials whose acoustic impedance values vary significantly?

A. Ultrasonics cannot be used due to the masking of debond signals by the interface signal

B. A video presentation may improve results

C. B-scan presentation may improve results

D. A phases change may be detected at the acoustic interface when using RF displays

91. During an ultrasonic test using the contact through transmission technique, there is a significant

signal loss. Which of the following should be done when the signal loss is noticed?

A. Check sensitivity setting of the ultrasonic instrument

B. Check couplant, and apply more couplant if necessary

C. Reinspect immediately with pulse echo

D. Record and report indications and continue testing

92. Surface wave techniques are often used in the testing of plate products because

A. Surface waves are only effective on flat, rolled surfaces

B. most plates are tested by immersion ultrasound and immersion transducers can easily be angulated

to produce surface waves

C. surface waves are very sensitive to shallow surface discontinuities induced by the rolling process

D. surface wave testing takes the advantage of excellent entry surface resolution inherent in immersion

pulse-echo testing

93. In resonance thickness testing, what type of waves produce resonance?

A. In-phase waves

B. Multiple waves

C. Single waves

D. Standing waves

94. An angle beam transducer producing a 45 degree shear wave beam in a low carbon alloy steel

specimen would produce a shear wave angle in a aluminum specimen

A. greater than 45 degrees

B. less than 45 degrees

C. 45 degrees

D. surface waves only

95. Which steel material interface would have the greatest impedance mismatch?(Steel is the first medium)

A. Steel to lead

B. Steel to plate glass

C. Steel to copper

D. Steel to nickel

96. An indication is found during contact shear wave weld inspection by ultrasonics and is believed to be

side wall lack of fusion. If the indication is lack of fusion, further analysis of the ultrasonic signal by

orbital(rotating) the probe should result in

A. a sudden amplitude drop

B. very little amplitude drop

C. a multi-faceted signal gradually increase in amplitude

D. a broad signal gradually decreasing in amplitude

97. When using a spherically focused sound wave for immersion testing, the sound enters the surface of

an aluminum plate at an oblique angle. Which of the following statements is the most correct?

A. The focal spot in the water is a shorter distance than the plate

B. The focal spot in the plate is a shorter distance than in the water

C. The focal spot in the plate is the same distance as in the water

D. The plate surface acts as a lens that is less powerful than the acoustic lens

98. An indirect pitch and catch test has been developed for weld discontinuities. The transmitting

transducer is inclined at an angle that produces 60 degree refracted shear wave. The receiving

transducer is positioned normal to the test object surface and defects the scattered waves. This

technique is known as

A. tandom transducer test

B. indirect pitch and catch test

C. time of flight diffraction test

D. Delta technique test

99. Calibration standards generally used for ultrasonic examination of metal tubing for longitudinal

discontinuities contain

A. side-drilled holes

B. flat-bottom holes

C. notches of slots

D. gaps

100. Ultrasonic testing and acceptance of forged raw stock prior to machining to it’s final form is a

common practice because

A. machined parts are typically tested by visual inspection

B. tests are frequently more difficult due to dead zones and structural reflections after machining

C. the forged parts are generally too small to test easily after machining

D. the sound wave generates the forging better than after it has cooled completely

 

 

 

 

 

answer

81	82	83	84	85	86	87	88	89	90
C	B	A	B	D	C	D	A	C	D
91	92	93	94	95	96	97	98	99	100
B	C	D	B	B	A	B	D	C	B