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UT lvl 2 ASNT questions
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Questions in this quiz (146)
1Generally, the best ultrasonic testing method for detecting
discontinuities oriented along the fusion zone in a welded plate
is:- AAn angle-beam contact method using surface waves.
- BA contact test using a straight longitudinal wave.
- CAn immersion test using surface waves.
- DAn angle-beam method using shear waves.
2An 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:- AA continuous wave display.
- BAn A-scan presentation.
- CA B-scan presentation.
- DA C-scan presentation.
3At 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:- ALongitudinal
- BShear
- CBoth A and B
- DSurface
4In a liquid medium, the only mode of vibration that exists is:In a liquid medium, the only mode of vibration that exists is:
- ALongitudinal
- BShear
- CBoth A and B
- DSurface
5In an ultrasonic instrument, the number of pulses produced by
an instrument in a given period of time is known as the:- APulse length of the instrument.
- BPulse recovery time.
- CFrequency.
- DPulse repetition rate.
6In a basic pulse-echo ultrasonic instrument, the component
that coordinates the action and timing of other components is
called a:- ADisplay unit or CRT.
- BReceiver.
- CMarker circuit or range marker circuit.
- DSynchronizer, clock, or timer.
7In a basic pulse-echo ultrasonic instrument, the component that
produces the voltage that activates the search unit is called:- AAn amplifier
- BA receiver
- CPulser
- DA synchronizer
8In a basic-pulse-echo ultrasonic instrument, the component that produces the time base line is called a:
- ASweep circuit
- BReceiver
- CPulser
- DSynchronizer
9In a basic pulse-echo ultrasonic instrument, the component
that produces visible signals on the CRT which are used to measure
distance is called a:- ASweep circuit
- BMarker circuit
- CReceiver circuit
- DSynchronizer
10Most basic pulse-echo ultrasonic instruments use:
- AAutomatic read-out equipment.
- BAn A-scan presentation.
- CA B-scan presentation.
- DA C-scan presentation.
11The cathode ray tube screen will display a plan view of the part
outline and defects when using:- AAutomatic read-out equipment.
- BAn A-scan presentation.
- CA B-scan presentation.
- DA C-scan presentation.
12The incident angles at which 90 degrees refraction of
longitudinal and shear waves occurs are called:- AThe normal angles of incidence.
- BThe critical angles.
- CThe angles of maximum reflection.
- DNone of the above.
13Compression waves whose particle displacement is parallel to
the direction of propagation are called:- ALongitudinal waves
- BShear waves
- CLamb waves
- DRayleigh waves
14Which of the following modes of vibration are quickly damped
out when testing by the immersion method?- ALongitudinal waves
- BShear waves
- CTransverse waves
- DSurface waves
15The motion of particles in a shear wave is:
- AParallel to the direction of propagation of the ultrasonic beam.
- BTransverse to the direction of beam propagation.
- CLimited to the material surface and elliptical in motion.
- DPolarized in a plane at 45 degrees to the direction of beam propagation.
16In contact testing, shear waves can be induced in the test material by:
- APlacing a X-cut crystal directly on the surface of the materials and coupling through a film of oil.
- BUsing two transducers on opposite sides of the test specimen.
- CPlacing a spherical acoustic lens on the face of the transducer
- DUsing a transducer mounted on a plastic wedge so that sound enters the part at an angle.
17As frequency increases in ultrasonic testing, the angle of
beam divergence of a given diameter crystal:- ADecreases.
- BRemains unchanged.
- CIncreases.
- DVaries uniformly through each wavelength.
18Which of the following is not an advantage of contact
ultrasonic search units(probes) adapted with lucite shoes?- AEliminates most of the crystal wear.
- BPermits adaptation to curved surfaces.
- CDecreases sensitivity.
- DAllows ultrasound to enter a part's surface at oblique angles.
19In which medium listed below would the velocity of sound be
lowest?- AAir
- BWater
- CAluminum
- DStainless Steel
20A 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:- ALess than the refracted angle of the longitudinal wave.
- BEqual to the refracted angle of the longitudinal wave.
- CGreater than the refracted angle of the longitudinal wave.
- DNot present at all.
21The velocity of longitudinal waves will be highest in:
- AWater
- BAir
- CAluminum
- DStainless Steel
22In steel, the velocity of sound is greatest in which of the
following modes of vibration?- ALongitudinal
- BShear
- CSurfave
- DSound velocity is identical in all modes, in a given material.
23The acoustic impedance is:
- AUsed to calculate the angle of reflection
- BThe product of the density of the material and the velocity of sound in the material.
- CFound by Snell's law
- DUsed to determine resonance values
24Thin sheet may be inspected with the ultrasonic wave directed
normal to the surface by observing:- AThe amplitude of the front surface reflection.
- BThe multiple reflection pattern.
- CAll front surface reflections
- DNone of the above.
25A 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:- ASchematic diagram
- BBlueprint
- CBlock diagram
- DNone of the above
26A hole produced during the solidification of metal due to
escaping gases is called:- AA burst
- BA cold shut
- CA flaking
- Da blow hole
27A 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:- AA burst
- BA cold shut
- CFlaking
- DA blow hole
28The ratio between the wave speed in one material and the wave
speed in a second material is called:- AThe acoustic impedance of the interface
- BYoung's modulus
- CPoisson's ratio
- DThe index of refraction.
29The expansion and contraction of a magnetic material under the
influence of a changing magnetic field is referred to as:- APiezoelectricity
- BRefraction.
- CMagnetostriction
- DRarefaction
30The ratio of stress to strain in a material within the elastic
limit is called:- AYoung's modulus
- BThe Modulus of elasticity
- CBoth A and B
- DThe index of refraction
31A point, line, or surface of a vibrating body marked by absolute
or relative freedom from vibratory motion is referred to as:- AA node
- BAn antinode
- CRarefaction
- DCompression
32A quartz crystal cut so that its major faces are parallel to
the Z and Y axes and perpendicular to the X axis is called:- AA Y-cut crystal
- BA X-cut crystal
- CA Z-cut crystal
- DA ZY-cut crystal
33The equation describing wavelength in terms of velocity and
frequency is:- AWavelength = Velocity x Frequency
- BWavelength = Z (Frequency x Velocity
- CWavelength = Velocity / Frequency
- DWavelength=Frequency + Velocity
34Which of the following can occur when an ultrasonic beam
reaches the interface of two dissimilar materials?- AReflection
- BRefraction
- CMode conversion
- DAll of the above
35Of the piezoelectric materials listed below, the most
efficient sound transmitter is:- ALithium sulfate
- BQuartz
- CBarium titanate
- DSilver oxide
36Of thepiezoelectric materials listed below, the most
efficient sound receiver is:- ALithium sulfate
- BQuartz
- CBarium titanate
- DSilver oxide.
37The most commonly used method of producing shear waves in a
test part when inspecting by the immersion method is:- ABy transmitting longitudinal waves into a part in a direction perpendicular to its front surface.
- BBy using two crystals vibrating at different frequencies.
- CBy using a Y-cut quartz crystal.
- DBy angulating the search tube to the proper angle.
38Beam divergence is a function of the dimensions of the crystal
and the wavelength of the beam transmitted through a medium, and it:- Aincreases if the frequency or crystal diameter is decreased.
- Bdecreases if the frequency or crystal diameter is decreased.
- Cincreases if the frequency is increased and crystal diameter decreased.
- Ddecreases if the frequency is increased and crystal diameter is decreased.
39The wavelength of an ultrasonic wave is:
- Adirectly proportional to velocity and frequency.
- Bdirectly proportional to velocity and inversely proportional to frequency.
- Cinversely proportional to velocity and directly proportional to frequency.
- Dequal to the product of the velocity and frequency.
40The fundamental frequency of a piezoelectric crystal is
primarily a function of:- Athe length of the applied voltage pulse.
- Bthe amplifying characteristics of the pulse amplifier in the instrument.
- Cthe thickness of the crystal.
- Dnone of the above.
41Acoustic velocities are primarily described by:
- Adensity
- Belasticity
- Cboth A and B
- Dacoustic impedance
42Inspection of castings is often impractical because of:
- Aextremely small grain structure.
- Bcoarse grain structure.
- Cuniform flow lines.
- Duniform velocity of sound.
43Lamb waves may be used to inspect:
- Aforgings
- Bbar stock
- Cingots
- Dthin sheet
44The resolving power of a search unit is directly proportional
to its:- Adiameter
- Bband width
- Cpulse repetition
- Dnone of the above
45In the basic pulse-echo instrument, the synchronizer, clock or
timer circuit will determine the instrument's:- Apulse length
- Bgain
- Cpulse repetition rate
- Dsweep length
46The primary requirement of a paintbrush transducer is that:
- Aall crystals be mounted equidistant from each other.
- Bthe intensity of the beam pattern not vary greatly over the entire length of the transducer
- Cthe fundamental frequency of the crystals not vary more than .01%.
- Dthe overall length not exceed 3 inches.
47Heat conduction, viscous friction, elastic hysteresis, and
scattering are four different mechanisms which lead to:- Aattenuation
- Brefraction
- Cbeam spreading
- Dsaturation.
48Since the velocity of sound in aluminum is approximately 245,000
in/sec, how long does it take for sound to travel through 1 inch of
aluminum?- A1/8 second
- B4 microseconds
- C4 milliseconds
- D1/4 X 100000 seconds
49When testing a part with a rough surface, it is generally
advisable to use:- Aa lower frequency search unit and a more viscous couplant than is used on parts with a smooth surface.
- Ba higher frequency search unit and a more viscous couplant than is used on parts with a smooth surface.
- Ca higher frequency search unit and a less viscous couplant than is used on parts with a smooth surface.
- Da lower frequency search unit and a less viscous couplant than is used on parts with a smooth surface.
50Reflection indications from a weld area being inspected by the
angle-beam technique may represent:- APorosity
- BCracks
- CWeld bead
- DAll three of the above
51In 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:- AA square wave pattern.
- BA sweep line.
- CA marker pattern.
- DNone of the above.
52Which of the following frequencies would probably result in
the greatest amount of attenuation losses?- A1.0 megahertz.
- B2.25 megahertz.
- C5 megahertz.
- D10 megahertz.
53In general, which waves will travel around gradual curves with
little or no reflection from the curve?- ATransverse waves.
- BSurface waves.
- CShear waves.
- DLongitudinal waves.
54To evaluate and accurately locate discontinuities after
scanning a part with a paintbrush transducer, it is generally
necessary to use a:- ASearch unit with a smaller crystal.
- BScrubber.
- CGrid map.
- DCrystal collimator.
55As the impedance ratio of two dissimilar materials increases,
the percentage of sound coupled through an interface of such materials:- ADecreases.
- BIncreases.
- CIs not changed.
- DMay increase or decrease.
56Low frequency sound waves are not generally used to test thin
materials because of:- AThe rapid attenuation of low frequency sound.
- BIncompatible wavelengths.
- CPoor near-surface resolution.
- DNone of the above will actually limit such a test.
57When using two separate search units (one a transmitter, the
other a receiver), the most efficient combination would be:- AA quartz transmitter and a barium titanate receiver.
- BA barium titanate transmitter and a lithium sulfate receiver.
- CA lithium sulfate transmitter and a barium titanate receiver.
- DA barium titanate transmitter and a quartz receiver.
58In immersion testing, the accessory equipment to which the
search cable and the search unit are attached is called a:- ACrystal collimator.
- BScrubber.
- CJet-stream unit
- DSearch tube or scanning tube.
59In general, discontinuities in wrought products tend to be
oriented:- ARandomly.
- BIn the direction of grain flow.
- CAt right angles to the entry surface.
- DAt right angles to the grain flow.
60In immersion testing irrelevant or false indications caused by
contoured surfaces are likely to result in a:- ABroad-based indication.
- BPeaked indication.
- C"Hashy" signal.
- DNarrow-based indication.
61In contact testing, defects near the entry surface cannot
always be detected because of:- AThe far-field effect.
- BAttenuation.
- CThe dead zone.
- DRefraction.
62In 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?- AA scrubber.
- BA collimator.
- CAn angle plane angulator.
- DA jet-stream unit.
63The maximum scanning speed possible is primarily determined
by:- AThe frequency of the searchunit.
- BViscous drag problems.
- CThe pulse repetition rate of the test instrument.
- DThe persistency of the CRT screen.
64Surface waves are reduced to an energy level of approximately
1/25 of the original power at a depth of:- AOne inch.
- BFour inches.
- COne wavelength.
- DFour wavelengths.
65To 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 one inch of
water for every:- ATwo inches of aluminum.
- BFour inches of aluminum.
- CSix inches of aluminum.
- DEight inches of aluminum.
66Increasing the length of the pulse used to activate the search
unit will:- AIncrease the strength of the ultrasound but decrease the resolving power of the instrument.
- BIncrease the resolving power of the instrument.
- CHave no effect on the test.
- DDecrease the penetration of the sound wave.
67Of the following sound wave modes, which one has multiple or
varying wave velocities?- ALongitudinal waves
- BShear waves
- CTransverse waves
- DLamb waves
68Which of the following would be considered application(s) of
ultrasonic techniques?- ADetermination of a material's elastic modulus
- BStudy of a material's metallurgical structure
- CMeasurement of a material's thickness
- DAll of the above.
69The only significant sound wave mode that will travel through
a liquid is:- AShear
- BLongitudinal
- CSurface
- DRayleigh
70The acoustic impedance of a material is used to:
- ADetermine the angle of refraction at an interface.
- BDetermine the attenuation within the material.
- CFind the amounts of sound energy reflected and refracted through an interface.
- DDetermine the beam spread within the material.
71Acoustic energy propagates in different modes. Which of the
following represents a mode?- ALongitudinal wave
- BShear wave
- CSurface wave
- DAll of the above
72When angle beam contact testing a test piece, increasing the
incident angle until the second critical angle is reached results in:- ATotal reflection of a surface wave.
- B45 degree refraction of the shear wave
- CProduction of a surface wave
- DNone of the above
73The simple experiment where a stick in a glass of water appears
disjointed at the water surface illustrates the phenomenon of:- AReflection
- BMagnification
- CRefraction
- DDiffraction
74The crystal thickness and transducer frequency are related. The
thinner the crystal:- AThe lower the frequency
- BThe higher the frequency
- CThere is no appreciable effect
- DNone of the above
75The random distribution of crystallographic direction in alloys
with large crystalline structure is a factor in determining:- AAcoustic noise levels
- BSelection of test frequency
- CScattering of sound
- DAll of the above
76The length of the zone adjacent to a transducer in which
fluctuations in sound pressure occur is mostly affected by:- AThe frequency of the transducer
- BThe diameter of the transducer
- CScattering of sound
- DBoth A and B
77The differences in signals received from identical reflectors
at different material distances from a transducer may be caused by:- AMaterial attenuation.
- BBeam divergence.
- CNear field effects.
- DAll of the above.
78It 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:- AFraunhofer zone.
- BNear field.
- CSnell field.
- DShadow zone.
79In immersion testing, the near field effects of a transducer
may be eliminated by:- AIncreasing transducer frequency.
- BUse of larger diameter transducer.
- CUsing an appropriate water path.
- DUse of a focused transducer.
80Which 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?- AMultiple indications before the first back reflection.
- BIndications from multiple surface reflection.
- CConversion from the longitudinal mode to shear mode.
- DLoss of front surface indications.
81Where does beam divergence occur?
- ANear field.
- BFar field.
- CAt the crystal.
- DNone of the above.
82As frequency increases in ultrasonic testing, the angle of
beam divergence of a given diameter crystal:- ADecreases
- BRemains unchanged
- CIncreases
- DVaries uniformly through each wavelength
83As the radius of curvature of a curved lens is increased, the
focal length of the lens will:- AIncrease
- BDecrease
- CRemain the same
- DBe indeterminate unless the frequency is known
84When examining materials for planar flaws oriented parallel to
the part surface, what testing method is most often used?- AAngle beam
- BThrough-transmission
- CStraight beam
- DDual crystal
85Rayleigh waves are influenced most by defects located:
- AOne wavelength below the surface
- BSix wavelengths below the surface
- CClose to or on the surface
- DThree wavelengths below the surface
86The ultrasonic test method in which finger damping is most
effective in locating a discontinuity is:- AShear wave
- BLongitudinal wave
- CSurface wave
- DCompressional wave
87Lamb waves can be used to detect:
- ALaminar-type defects near the surface of a thin material
- BLack of fusion in the center of a thick weldment
- CInternal voids in diffusion bonds
- DThickness changes in heavy plate material
88The ratio of the velocity of sound in water compared to that
for aluminum or steel is approximately:- A1:4
- B1:2
- C1:8
- D1:3
89Which of the following scanning methods could be classified as
an immersion type test?- ATank in which the search unit and test piece are immersed
- BSquirter bubbler method in which the sound is transmitted in a column of flowing water
- CScanning with a wheel-type search unit with the transducer inside a liquid filled tire
- DAll of the above
90In 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:- AReduced velocity of sound in water as compared to test specimen.
- BIncreased velocity of sound in water as compared to test specimen.
- CTemperature of the water.
- DAll of the above.
91What law can be used to calculate the angle of refraction
within a metal for both longitudinal and shear waves?- APoisson's Ratio Law
- BSnell's Law
- CFresnel's Field Law
- DCharles' Law
92At an interface between two different materials, an impedance
difference results in:- AReflection of the entire incident energy at the interface
- BAbsorption of sound
- CDivision of sound energy into transmitted and reflected modes
- DNone of the above
93When using focused transducers, non-symmetry in a propagated
sound beam may be caused by:- ABacking material variations
- BLens centering or misalignment
- CPorosity in lenses
- DAll of the above
94Ultrasonic wheel units may be used for which of the following
types of examination?- AStraight or longitudinal examination
- BAngle-beam or shear wave examination
- CSurface wave or Rayleigh wave
- DAll of the above
95During straight beam testing, test specimens with non-parallel
front and back surfaces can cause:- APartial or total loss of back reflection
- BNo loss in back reflection
- CA widened (broad) back reflection indication
- DA focused (narrow) back reflection indication
96In 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.- AIs equal to the time required for the sound to travel through the piece.
- BIs greater than the time required for the sound to travel through the test piece.
- CIs less than the time required for the sound to travel through the test piece.
- DNone of the above.
97In a B-scan display, the length of a screen indication from a
discontinuity is related to:- AA discontinuity's thickness as measured parallel to the ultrasonic beam.
- BThe discontinuity's length in the direction of the transducer travel.
- CBoth A and B
- DNone of the above
98Which circuit triggers the pulser and sweep circuits in an
A-scan display?- AReceiver-amplifier
- BPower supply
- CClock
- DDamping
99On an A-scan display, the "dead zone," refers to:
- AThe distance contained within the near field.
- BThe area outside the beam spread.
- CThe distance covered by the front surface pulse width and recovery time.
- DThe area between the near field and the far field.
100On an A-scan display, what represents the intensity of a
reflected beam?- AEcho pulse width
- BHorizontal screen location
- CSignal brightness
- DSignal amplitude
101Of 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?- AA-scan
- BB-scan
- CC-scan
- DD-scan
102In immersion testing in a small tank, a manually operated
manipulator is used to:- ASet the proper water path
- BSet the proper transducer angle
- CSet the proper index function
- DBoth A and B
103A 45 degrees shear angle beam transducer produces a wave in
the metal which is polarized:- APerpendicular to the direction of propagation and parallel to the entry surface.
- BIn the direction of propagation and at 45 degrees to the normal to the entry surface.
- CPerpendicular to the entry surface.
- DPerpendicular to the direction of propagation and at 45 degree to the entry surface.
104In straight (normal) beam contact testing, a reduction in the
back surface reflection amplitude could indicate:- AInadequate coupling.
- BA flaw which is not normal to the beam.
- CA near surface defect that cannot be resolved from the main bang (initial pulse).
- DAll of the above
105In an automatic scanning immersion unit, the bridge or
carriage serves to:- ASupport the manipulator and scanner tube and to move it about transversely and longitudinally.
- BControl the angular and transverse positioning of the scanner tube.
- CControl the vertical and angular positioning of the scanner tube.
- DRaise and lower the transducer.
106When adjusting the flaw locating rule for a shear wave weld
inspection, the zero point on the rule must coincide with the:- ASound beam exit point of the wedge
- BPoint directly over the flaw
- CWheel search unit
- DCircular scanner
107A special scanning device with the transducer mounted in a
tire- like container filled with couplant is commonly called;- AA rotating scanner
- BAn axial scanner
- CA wheel search unit
- DA circular scanner
108Which best describes a typical display of a crack whose major
surface is perpendicular to the ultrasonic beam?- AA broad indication
- BA sharp indication
- CThe indication will not show due to improper orientation
- DA broad indication with high amplitude
109Compensation for the variation in echo height related to variations
in discontinuity depth in the test material is known as:- ATransfer
- BAttenuation
- CDistance amplitude correction
- DInterpretation
110Which of the following is a reference reflector that is not
dependent on beam angle- AA flat bottomed hole
- BA vee notch
- CA side drilled hole which is parallel to the plate surface and perpendicular to the sound path
- DA disc shaped laminar reflector
111During a straight beam ultrasonic test a discontinuity
indication is detected which is small in amplitude compared
to the loss in amplitude of back reflection. The orientation
of this discontinuity is probably:- AParallel to the test surface.
- BParallel (plus or minus 5 degrees) from the test surface.
- CParallel to the sound beam.
- DSuch that complete loss of back reflection will result.
112A 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:- ALarge in proportion to the length of the discontinuity.
- BSmall in proportion to the length of the discontinuity.
- CRepresentative of the length of the discontinuity.
- DSuch that complete loss of back reflection will result.
113Gas discontinuities are reduced to flat discs or other shapes
parallel to the surface by:- ARolling
- BMachining
- CCasting
- DWelding
114In which zone does the amplitude of an indication from a given
discontinuity diminish exponentially as the distance increases?- AFar field zone
- BNear field zone
- CDead zone
- DFresnel zone
115A smooth flat discontinuity whose major plane is not
perpendicular to the direction of sound propagation may be indicated by:- AAn echo amplitude comparable in magnitude to the back surface reflection.
- BA complete loss of the back surface reflection.
- CAn echo amplitude larger in magnitude than the back surface reflection.
- DAll of the above.
116Using 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:- ALoss of signal linearity
- BLoss or lack of a received discontinuity echo
- CFocusing of the sound beam
- DLoss of interference phenomena
117As transducer diameter decreases, the beam spread:
- ADecreases
- BRemains the same
- CIncreases
- DBecomes conical in shape
118A 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:- ADistance/amplitude standards.
- BArea/amplitude standards.
- CVariable frequency blocks.
- DBeam spread measuring blocks.
119The angle at which 90 degree refraction of a longitudinal
sound wave is reached is called:- AThe angle of incidence.
- BThe first critical angle.
- CThe angle of maximum reflection.
- DThe second critical angle.
120Which of the following controls the voltage supplied to the
vertical deflection plates of the CRT in an A-scan UT setup?- ASweep generator
- BPulser
- CAmplifier circuit
- DClock timer
121Attenuation 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:- ABeam spread
- BCouplant mismatch
- CTest piece geometry
- DAll of the above
122The vertical linear range of a test instrument may be
determined by obtaining ultrasonic responses from:- AA set of distance-amplitude reference blocks.
- BSteel balls located at several different water path distances.
- CA set of area-amplitude reference blocks.
- DAll of the above.
123Large grains in a metallic test specimen usually result in:
- ADecrease or loss of back surface reflection.
- BLarge "hash" or noise indications.
- CDecrease in penetration.
- DAll of the above.
124The total energy losses occurring in all materials is called:
- AAttenuation
- BScatter
- CBeam spread
- DInterface
125Delay-tip(stand-off)type contact search units are primarily
used for:- ADefect detection.
- BSound wave characterization.
- CThickness measurement of flaw detection in thin materials.
- DAttenuation measurements.
126Acoustical 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?- AFocused cup
- BConvex
- CConcave
- DVariable pitch
127When the incident angle is chosen to be between the first and
second critical angles, the ultrasonic wave generated within the
part will be:- ALongitudinal
- BShear
- CSurface
- DLamb
128The attenuation of energy within a material in the far field
of the ultrasonic beam may be expressed as the:- AArithmetic mean
- BGeometrical average
- CExponential average
- DExponential decay
129For aluminum and steel the longitudinal velocity is approximately
_________ the shear velocity:- AEqual to
- BTwice
- COne-half of
- DFour times
130Water travel distance for immersion inspections should be:
- ASuch that the second front reflection does not appear between the first front and back reflections.
- BExactly 3 inches.
- CLess than 3 inches.
- DAlways equal to the thickness of the material being inspected.
131The electronic circuitry that allows selection and processing
of only those signals relating to discontinuities that occur in
specific zones of a part is called:- AAn electronic gate.
- BAn electronic attenuator.
- CA distance amplitude correction circuit.
- DA fixed marker.
132When 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:- AFine grains in the structure.
- BDirt in the water couplant.
- CCoarse grains in the structure.
- DA thick but tapered back surface.
133In inspecting a 4-inch diameter threaded steel cylinder for
radial cracks extending from the root of the threads, it would be
preferable to transmit:- AShear waves at an angle to the threads.
- BLongitudinal waves from the end of the cylinder and perpendicular to the direction of the thread roots.
- CSurface waves perpendicular to the thread roots.
- DShear waves around the circumference of the cylinder.
134In an immersion inspection of raw material, the water travel
distance should be:- AExactly 3 inches.
- BEqual to 3 inches (plus or minus 1/2 inch).
- CEqual to the water travel distance used in setting up on the reference standards.
- DEqual to the thickness of a material.
135The 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:- AThe angle of incidence.
- BThe angle of refraction.
- CThe angle of rarefaction.
- DThe angle of reflection.
136The process of adjusting an instrument or device to a reference
standard is referred to as:- AAngulation
- BScanning
- CCorrecting for distance-amplitude variations
- DCalibration
137An 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:- AAn amplifier tube
- BA pulser tube
- CA cathode ray tube
- DA sweep tube
138A grouping of a number of crystals in one search unit, with
all contact surfaces in the sample plane, and vibrating in phase
with each other to act as a single transducer is called a:- AFocusing crystal
- BCrystal mosaic
- CScrubber
- DSingle plane manipulator
139The scattering of the ultrasonic energy of an ultrasonic beam
due to reflection from a highly polished surface is called:- AAngulation
- BDispersion
- CRefraction
- DRarefaction
140The angle of reflection is:
- AEqual to the angle of incidence.
- BDependent on the couplant used.
- CDependent on the frequency used.
- DEqual to the angle of refraction.
141The angular position of the reflecting surface of a planar
discontinuity with respect to the entry surface is referred to as:- AThe angle of incidence.
- BThe angle of refraction.
- CThe orientation of the discontinuity.
- DNone of the above.
142A short burst of alternating electrical energy is called:
- AA continuous wave
- BA peaked DC voltage
- CAn ultrasonic wave
- DA pulse
143In ultrasonic testing, the time duration of the transmitted
pulse is referred to as:- AThe pulse length or pulse width
- BThe pulse amplitude
- CThe pulse shape
- DNone of the above
144The phenomenon by which a wave strikes a boundary and changes
the direction of its propagation within the same medium is referred
to as:- ADivergence
- BImpedance
- CAngulation
- DReflection
145The 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:- ARefraction
- BRarefaction
- CAngulation
- DReflection
146The coated inside surface of the large end of a cathode ray
tube which becomes luminous when struck by an electron beam is called:- AAn electron gun
- BAn electron amplifier
- CA CRT screen
- DAn electron counter
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- NDE Technician Non Destructive Testing Quiz on UT lvl 2 ASNT questions, created by Eugene Cawley on 17/12/2018.
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