QUIZ) ASNT L3 UT6

 

101. The most common discontinuities found in castings are oriented completely at random. Which of

the following statements if true concerning ultrasonic examination of casting?

A. Shear wave tests in two directions 90 degrees to each other is recommended, when possible

B. Compression wave ultrasonic tests in one direction is recommended

C. Calibration is usually based on the response from drilled flat bottomed holes but may also be based

on the back reflection height

D. the grain structure in castings is very small, making it easy to test in more than one direction

102. Which of the following factors would not be considered during selection of transducer type and size

for ultrasonic inspection of ingots?

A. The type of ultrasonic test/technique to be used

B. The metal cross section/travel distance

C. The system performance characteristics

D. The type/grain size of material being tested

103. During underwater thichness measurements of corrosion pitted steel structures, with a focused

transducer positioned where the focal spot is above the steel surface

A. the pits act as a lens and produce significant reflections

B. the reflections from the rough surface can be eliminated

C. the pits produce insignificant reflections

D. the signal is maxmized near the periphery edge of the pit

104. Which of the following is not a material property consideration for ultrasonic test blocks

A. alloy content

B. heat treatment

C. Degree of hot or cold working due to forging, rolling, or extruding

D. coupling factor

105. The articipated measurement tolerance to be expected during manual ultrasonic thickness

measurement using only an A-scan analog display is

A. plus or minus 2 % of full screen

B. plus or minus 5 % of full screen

C. plus or minus 10 % of full screen

D. plus or minus 15 % of full screen

106. An advantage of an electromagnetic acoustic transducer(EMAT) is that it can operate at high

temperatures. One application in steel production of thick slabs is measurement of

A. number of discontinuities in the slab

B. determination of the scale thickness

C. determination of the sound velocity

D. the internal temperature of the slab

107. An examination specification requires scanning at five times calibration level. How many decibels(dB)

should be added to the set-up calibration to achive this sensitivity?

A. 5 dB

B. 6 dB

C. 10 dB

D. 14 dB

108. Assuming that a surface wave made is achived with a contact transducer. What is the approximate

depth of penetration of this surface wave in the test material?

A. Between 0.050 inch and 0.100 inch in most materials

B. 2 times the wavelength in the test material

C. equal to the wavelength in the test material

D. One-half the wavelength in the test material

109. What is the depth of the longitudinal near-field in a steel plate 5 inches thick when tested with a

2.25 MHz contact transducer having a 0.75 inch diameter circular element?

A. 0.25 inch

B. 0.635 inch

C. 0.807 inch

D. 1.35 inch

110. Scattering of an ultrasonic beam due to reflection from irregular surface is called

A. angulation

B. dispersion

C. refraction

D. attenuation

111. The ultrasonic A-scan display of clustered forging burst indications in stainless steel turbine wheel

rims can best be described as

A. a continuous indication traversing paralled to the rim with complete loss of back reflection

B. indications that are consistent as the transducer is moved along the contoured rim

C. groups of indications with varying degrees of amplitude

D. a continuous, wide, low level envelope showing multiple peak, with or without a back reflection

112. Dual element transducers are typically not used for

A. detection of small discontinuities that are close to the surface

B. thickness inspection

C. corrosion inspection

D. immersion testing

113. Calibration notches for complete examination of metal tubing for longitudinal discontinuities should

be applied to

A. the O.D surface

B. the I.D surface

C. the O.D and I.D surface

D. both O.D and I.D surfaces and separated by some given distance

114. Which of the following is correct use of ultrasonic testing principal liquid level sensing?

A. By measuring the time of flight reflected ultrasonic energy in a pulse echo setup the level of liquid

can be calculated it velocity liquid is known

B. If the difference of shear wave and longitudinal wave in a liquid is known. The liquid thickness can

be calculated through be observance of the difference in arriving time between shear wave echo and

longitudinal echo in a pulse echo setup

C. The amount of attenuation is directly related to the distance the sound wave has traveled inside the

liquid. Therefore there is a linear relationship between liquid level and echo amplitude

D. Liquid level can only the be monitored by using advanced technique such as laser ultrasonic

technique from above the liquid level

115. When carrying out a weld examination using an ultrasonic system with digital signal processing

signals can be evaluated using which of the following?

A. Radiofrequency amplifiers

B. Bandwidth detectors

C. Frequency spectrum analysts

D. An analog to digital converter

116. In order to generate a surface wave in a material the angle of incidence should

A. equal the first critical angle

B. exceed the second critical angle by 12 degrees

C. equal the second critical angle

D. by 50% of the second critical angle

117. Which of the following information is needed when an ultrasonic test is performed on a composite

(bonded) material and disbands must be located?

A. The thichness of the substrates must be known

B. A distance amplitude correction curve for the full thickness for the composite material

C. the full thickness of the composite material must be known

D. The thickness of the bonding agent must be known

118. Hysteresis in an immersion "C" scan recording is primary caused by

A. magnetic field build-up in the scanning tube

B. bridge system mechanics

C. ultrasonic instrument electronics

D. water path

119. Regarding contact ultrasonic applications, the typical A-scan signal characteristic of a crack in the

heat affected zone of a weld may include which of the following

A. a broad break of the instrument time base

B. a narrow break of the time base with a short rise and fall of the signal

C. a broad break of the instrument time base with a slow rise and fall of the signal

D. a narrow break of the time base with a slow response in the rise and fall of the signal

120. During immersion test of a component with a curved surface a focused transducer preferred

A. to minimize near field effects

B. to reduce distortion of the wave

C. when testing with high frequencies

D. to enhance the speed of testing

 

 

answer

101	102	103	104	105	106	107	108	109	110
C	B	C	D	A	B	D	C	D	B
111	112	113	114	115	116	117	118	119	120
D	D	D	A	D	C	C	C	B	A