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44 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Convert 1.35x10^5 inch/sec to velocity in mm/sec
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- 3.429x10^5
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1inch=25.4mm
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Calculate (C) when (A) = 2.0 inches
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- 5.84
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Calculate 34.5÷0.045×sin(45)
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-542
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Temperature changes ultrasonic velocity? T or F
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- True
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Calculate full screen height
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- 70%
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Name the reflected wave in the figure above
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- B
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Name the refracted angle in the figure above
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- -o- a
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Calculate the refracted angle
sin -0-1 = 35 degrees V1plexiglass = 1.09×10^5 V2steel = 1.25×10^5 |
- 41 degrees
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Use Snells Law
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An ultrasonic transducer consists of...
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- Piezoeletric Crystal
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When measuring thickness at high temperatures...
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- Calibration should be done at a temp as close as possible to the temperature of the component being inspected.
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What is the correct formula for the near-field
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D^2÷4×Wavelength
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Which transducer has a bigger beam divergence?
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2.25mhz, 0.375diameter
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The focal length of a transducer can be...
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smaller than the near-field
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If the velocity of a longitudinal wave is 6×10^5 inch/sec, the velocity of a shear wave is..
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- 3.5×10^5 inch/sec
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The preferred wave for thickness measurements is..
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- L-wave
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The preferred angle for angle beam is testing for the crack shown above
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- 60
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Calculate "A"
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- 5.2
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The middle path for the full "V" is...
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- 6 inches
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The ultrasonic velocity in the material can be varied by changing...
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nothing
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What is the flaw is the depth above?
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- 1.0 inch
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What should be the refracted angle of the transducer to detect crack "a" and "b" above?
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- 30 degrees
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Which material has higher ultrasonic attenuation?
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- Rubber
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For highly attenuative material use...
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- Low frequency
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How do you increase near surface resolution?
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- Dual transducer
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What transducer should be selected to resolve two closely spaced flaws in a carbon steel?
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- High damped 5.0 mhz transducer
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Which has a higher signal to noise ratio above?
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- B
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Transducer diameter increases, the beam spread...
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- Decrease
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The crack sizing method shown in this figure is called...
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- Tip diffraction
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Which figure is a C scan?
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- (A)
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Which figure is an A-scan display?
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- (B)
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The angle beam on T1 is used to determine?
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- Exit point
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The straight beam on T2 is used to determine?
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- Resolution
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The angle beam on T3 is used to determine?
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- Refracted angle
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The block shown above has to be used to obtain a DAC curve for angle beam exam. What is the depth if the thickness is 2 inches?
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- .5 inches
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Which straight beam transducer location is best for detection of the crack in the component?
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- (C)
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The indication shown above is...
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- 50% DAC
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In the problem above how many decibels is the signal below reference?
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- 6 DB
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Which reflector will produce a bigger signal?
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- (A)
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A 5MHZ transducer that produces shear wave in steel will always have a wave length of ____ inches?
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- 0.025"
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Will there be a reflection from the Babitt/Steel interface?
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- Yes
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The amplitude of two signals A and B is 2.4 volts and 1.2 volts respectively. What is the ratio of signal A to signal B in dB?
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- 6dB
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The ratio of two signals is 14 dB. What is their ratio in percentage?
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- 5:1
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If you were inspecting a weld with a thickness of 1 inch using a 45 degree transducer and an indication was detected at a middle path of 2.1 inches, what would be the depth of the indication?
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- 0.5 inches
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When inspecting a weld with the shear wave method a sharp indication is detected and plotted off the centerline of the weld at the bottom surface of the part. The plots from either side of the weld, lack less than, 1/16th of an inch from touching. What do you think it is?
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- inadequate penetration
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