Test
Inspection
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Preguntas del test (38)
1What is reduction of surface area?
- ASurface Tension
- BCapillary Action
2Effect of increasing voltage (kV) in an X-Ray machine is to
- AIncrease the X-Ray beam intensity wo changing its wavelength
- BDecrease the intensity and shorten the wavelength
- CIncrease the intensity and shorten the wavelength
3Put in order of increasing absorption of X-Rays
- ASteel, Tungsten, Weld Slag
- BTungsten, Steel, Weld Slag
- CWeld Slag, Steel, Tungsten
4Only thing that causes fuzziness at edge of image is geometric unsharpness
- AVerdadero
- BFalso
5What is specified range of density of radiograph?
- A2 to 5
- B1.5 to 3.5
- C0.5 to 5.5
6How to shorten wavelength of X-Rays emitted by X-Ray machine?
- AUse faster film
- BIncrease filament current
- CUse lead screens
- DPlace source closer to workpiece
- EIncrease voltage on machine (kV)
7How do Gamma Rays compare to X-Rays
- AX can be used on thicker sections than Gamma
- BGamma has greater penetrating ability but generally give poorer contrast
- CGamma always require longer exposure on thin sections
- DGamma are less penetrating but give better image
- EWavelength of Gamma gets longer as source gets old whereas wavelength of X is fixed
8Source size 4mm, weld thickness 25.4mm, plate-to-source distance of 900mm; What is geometric unsharpness?
- A0.113 mm
- B0.007 mm
- C141.7 mm
- D0.0282 mm
9How large is the hole in the IQI that must be clearly distinguished on X-Ray?
- A2T (T is weld thickness)
- B2T (T is thickness of IQI)
- C0.255 mm
- DT (T is thickness of IQI)
- E1 mm
10Dark Narrow area 2~3mm along edge of area representing weld. Joint is 60deg Double Vee. What is dark area represent?
- AUndercut
- BSlag Entrapment
- CRoot Crack
- DIncomplete Penetration
- ELack of side wall fusion
11What is upper limit of Human hearing?
- A15 Hz
- B15 kHz
- C15 MHz
12What is typical frequency of ultrasonic testing of welds?
- A2.25 MHz
- B2.25 KHz
- C2.25 Hz
13Do transverse waves in a solid travel faster or slower than longitudinal waves?
- ATransverse is faster
- BTransverse is slower
14Decrease in energy of UT wave as it travels through medium is known as
- AAmplitude
- BAmplification
- CAttenuation
15Piezoelectric Xtls can
- AChange mechanical pulses into electrical pulses
- BChange electrical pulses into mechanical pulses
- CBoth above
16What determines the natural frequency of a given piezoelectric transducer?
- AAmplitude of the voltage applied
- BTransducer thickness
- CFrequency is set by the material being inspected and cannot be changed
17In conventional UT the wave is injected into the specimen as
- Aa continuous wave at the natural frequency of the transducer
- Ba short pulse containing several oscillations at the natural frequency
18A couplant is only needed if the surface is rough
- AVerdadero
- BFalso
19A-scan display, the vertical displacement of the trace represents
- AAmplitude of the reflected wave
- BSize of the reflector
- CDistance
20A-scan display the horizontal displacement of the trace is calibrated to represent
- AThe amplitude of the reflected wave
- BThe size of the reflector
- CDistance
21The ability to detect small reflectors (sensitivity) is increased by
- AIncreasing the frequency
- BDecreasing the frequency
- CIs not related to frequency
22The ability of a UT system to distinguish closely spaced reflectors is known as
- ASensitivity
- BResolution
- CAttenuation
23Beam spread is reduced by having a small ratio of wavelength to transducer size
- AVerdadero
- BFalso
24The plate and the weld surface must always be ground smooth prior to UT
- AVerdadero
- BFalso
25When using an angle probe, when would it be necessary to bounce the beam off the back wall?
- AThe beam cannot bounce off the back wall
- BThis technique should not be used
- CTo examine parts of the weld that cannot be accessed by the beam directly
26Difficulties with UT can arise when welds have backing bars due to reflections from corners, internal reflections in the bars, etc.
- AVerdadero
- BFalso
27Which of the following materials requires special techniques for UT?
- ACarbon steel used in PV
- BAustenitic stainless steel
- CStructural steel for bridges
28Transducer in the probe always acts as the transmitter and the receiver of the UT pulse
- AVerdadero
- BFalso
29Distance calibration using an IIW block for a normal (longitudinal mode) probe requires the probe to be placed
- AOn the top of the block such that the beam reflects from the 1.5 mm hole
- BOn the other edge to reflect off the curved end
- COn the side to reflect off the back wall
30Resolution cannot be checked because it is a function of the design of the equipment
- AVerdadero
- BFalso
31How is it possible to inspect most of a weld using an angle probe?
- ABy using a very large probe
- BBy placing the probe on the weld reinforcement
- CBy scanning from adjacent to the weld moving in and out and along the weld
32How would you expect the amplitude of the wave reflected from a spherical pore to vary as the direction of approach of the beam is changed?
- AIt would rise to a maximum then decrease
- BIt would rise to a peak only if the probe were moved in the plane of the plate
- CIt would not vary significantly
33Method for measuring the characteristic length of a reflector according to W59 involves
- AMeasuring between the two locations where the amplitude reaches a peak
- BMeasuring between the two points where the indication has disappeared
- CMeasuring between the two points where the amplitude drops to 50% of its maximum value
34Most codes and standards the acceptance of rejection of a discontinuity is based on whether it is shown that it will cause failure
- AVerdadero
- BFalso
35In W59, how is the effect of attenuation taken into account?
- ABy assuming a loss of 1 dB per 12.7 mm of sound path greater than 25.4 mm
- BBy determining the DAC curve
- CAttenuation is neglected
36The frequency of the ultrasonic wave:
- Ais set by a knob on the equipment
- Bdepends on the transducer selected
- Cis calibrated using an IIW block
- DChanges as the wave enters the material
- Ereduces as the wave travels through the material
37What is the first item that should be checked or calibrated on an angle probe?
- AWavelength
- BCalibration is not necessary
- CAngle
- DLinearity
- EExit (index) point
38What three dB values are needed to calculate the indication rating according to W59
- AReference level, indication level, attenuation factor
- BReference level, 1.5 mm side hole level, indication level
- C1.5 mm side hole level, reference level, attenuation factor
- DExit point level, attenuation level, DAC
- EDAC, 6dB drop value, reference level
Información
- Descripción
- (Flash Cards / Quizes) CWB Level 2 Test sobre Inspection, creado por Grant Aden el 09/06/2015.
- Autor
- Grant Aden
- Idioma
- English
- Visitas
- 16
- Etiquetas
- Valoración
- Aún sin valoraciones Valora este test