17028056
Descrição
FlashCards por Rusty Shackleford, atualizado more than 1 year ago
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Criado por Rusty Shackleford
quase 6 anos atrás
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| Questão | Responda |
| If the major dimensions of a discontinuity in a 15 cm (6in.) thick aluminum plate lie parallel to the entry surface at a depth of 76 mm (3 in.) it will be best detected by: | a straight beam test |
| when setting up a distance amplitude correction curve using 3 flat bottom holes, sometimes the hole closest to the transducer gives less of a response than one or both of the other two, this could be caused by: | near field effects, inconsistent surface of the calibration block, incorrect hole geometry |
| when an ultrasonic beam passes through the interface between two dissimilar materials at an angle, a new angle of sound travel takes place in the second material due to: | refraction (read this one carefully because they will trick you with the word "rarefaction") |
| Which of the following discontinues located 15 cm (6 in.) from the entry surface would result in the largest CRT indication if all factors except discontinuity surface condition and orientation are the same? | a 2mm (0.08 in.) diameter FLATE-SURFACED discontinuity shoes major face is PERPENDICULAR to the direction of sound beam propagation |
| ultrasonic testing of material were the search unit is in direct contact with the material being tested bay be: a. angle beam testing. b. all answers. C. surface wave testing. D. straight beam testing. | B. all answers |
| most commercial ultrasonic testing is accomplished using frequencies between: a. 15 and 100 MHz B. 0.2 and 25 MHz C. 1 and 100 kHz D. 1 and 25 kHz | 0.2 and 25 MHz |
| when performing a surface wave test, indications may result from: a. oil on the surface b. surface discontinuities c. all answers d. dirt on the surface | all answers |
| an ultrasonic test thing a straight beam contact search unit is being conducted through the thickness of a flat part such as a plate. this test should detect: | laminar-type flaws with major dimensions PARALLEL to the rolled surface |
| which component in an ultrasonic immersion system is used to adjust and maintain a known transducer angle? a. search tube b. manipulator c. carriage d. index system | b. manipulator |
| the velocity of sound in a material is dependent upon the: a. frequency of the wave b. material properties c. wavelength d. vibration cycle | b. material properties |
| The indication on the cathode ray tube (CRT) with represents the far boundary of the material being tested is called: A. thi initial pause B. the main bang C. the back surface reflection D. hash | The back surface reflection |
| A search unit containing three or more individual transducer elements is often referred to as: a. sandwich transducer b. dual transducer c. a mosaic transducer d. none of the above | c. a mosaic transducer |
| on the area amplitude ultrasonic standard test blocks the flat bottom holes in the blocks are: | different in diameter, increasing by 0.4 mm (0.016 in.) increments from the No "1" block to the No. "8" block |
| what is the most common type of data display used for ultrasonic examination of welds? A. B-scan B. C-Scan C. A-scan D. X-Y plot | C. A-scan |
| As the grain site increases in a material, its principal effect In ultrasonic testing is on the: a. angle of refraction b. velocity of sound c. attenuation d. acoustic impedance | c. attenuation |
| which circuits modify the return signal from the receiving transducer into a form suitable for display on an oscilloscope or other output device? a. receiver-amplifier b. pulser c. sweep d. clock | a. receiver-amplifier |
| a separate time base line imposed on the viewing screen of some ultrasonic testing instruments that permits measurement of distances is often referred to as: a. sweep line b. initial pulse c. marker d. time/distance line | c. marker |
| Search units constructed with a plastic wedge or standoff between the transducer element and the test piece are commonly used for a. surface wave contact testing b. angle beam contact testing c. dual transducer straight beam contact testing d. all answers | d. all answers |
| in immersion testing, verification that the search unit is normal to a flat entry surface is indicated by: a. elimination of water multiples b. maximum amplitude of the initial pulse c. proper wavelength d. maximum reflection from the entry surface | d. maximum reflection from the entry surface |
| in ultrasonic testing, a liquid coupling medium between the crystal surface and the part surface is necessary because: | an air interface between the crystal surface and the part surface would almost completely reflect the ultrasonic vibrations |
| penetration of ultrasonic waves in a material is normally the function of test frequency used. which of the following frequencies would provide the greater depth of penetration? a. 1 MHz b. 2.25 MHz C. 10 MHz D. 5MHz | A. 1 MHz (lower frequencies= greater depth of penetration) |
| Which frequency will produce the shortest wavelength pulse? a. 25 MHz B. 1 MHz C. 5 MHz D. 10 MHz | a. 25 MHz (high frequency = short wavelength) |
| if a discontinuity is located in the fresnel or near field region of a sound beam: | in immersion testing, the amplitude of REFLECTED SIGNAL may INCREASE OR DECREASE as water path decreases |
| an ultrasonic testing technique in which the transducer element is not parallel to the test surface is called A. contact testing B. through-transmission testing c. immersion testing d. angle beam testing | d. angle beam testing |
| a. C-scan b. A-scan c. D-scan d. B-scan | A. C-Scan |
| The component in a conventional immersion system that spans the width of the immersion tank is called: a. a bridge b. search tube c. manipulator d. articulator | a. a bridge |
| A. surface wave testing b. angle beam testing c. straight beam testing d. immersion testing | c. straight beam testing |
| in immersion testing, the most commonly used coupling is: a. oil b. water c. glycerin d. alcohol | b. water |
| if the velocity of a longitudinal mode wave in a given homogenous material is 0.625 cm/ns at 13 mm )0.5 in.) below the surface, what is the velocity at 51 mm (2 in.) below the surface? | The same as the velocity at 13mm (0.5 in.) (velocity is a constant) |
| reasons for using reference/ calibration standards? | They provide a common basis for expressing test results. they provide a measure of the test systems performance. they provide a method for standardizing the test system. (all answers) |
| most ferrous and nonferrous welds may be ultrasonically tested using a frequency range of: a. 1-2.25 MHz b. 25-100 kHz c. 3-6 MHz d. 10-20 MHz e. 200-500 kHz | a. 1-2.25 mHz |
| the boundary between two different materials which are in contact with each other is called: a. rarefactor b. refractor c. marker d. interface | d. interface |
| in immersion testing, a wetting agent is added to the water to: a. prevent cloudiness b. adjust the viscosity c. help eliminate the formation of air bubbles | d. help eliminate the formation of air bubbles |
| When a C-scan recording is used to produce a permanent record of an ultrasonic test, the information displayed is typically the discontinuities: a. location and depth b. depth and size c. depth orientation and size d. location and size (plan view) | d. location and size (plan view) (any answer that says "depth" is wrong |
| 100 000 cycles per second can be written: a. 0.1 kHz b. 100 kHz c. 10 kHz d. 100 MHz | b. 100 kHz |
| the primary purpose of reference blocks is to: a. Aid the operator in obtaining max back reflectors b. obtain a common reproducible signal c. obtain the greatest sensitivity possible from an instrument | b. obtain a common reproducible signal |
| the first back surface reflection | |
| in the transverse or hear wave, the particles: a. oscillate at a right angle to the direction of wave propagation b. oscillate parallel to the direction of wave propagation c. move in a elliptical pattern | a. oscillate at a right angle to the direction of wave propagation |
| when performing a contact inspection on a curved surface, what piece of equipment can be used to improve coupling: a. a spherically focused transducer b. a shaped shoe c. a cylindrically focused transducer d. a large diameter transducer | b. a shaped shoe |
| ultrasound is generally defined as sound t frequency above the threshold of human hearing which is? a. 20,000 Hz b. 2 Hz c. 20,000 MHz d. 2 Mhz | a. 20,000 Hz |
| the number of cycles per second is the definition of: a. hertz b. wave speed c. none of the answers d. frequency | d. frequency |
| Snell's Law describes the relationship between the sound velocity and: a. the refracted angle b. the reflected angle c. both d. none | c. both (refracted and reflected angle) |
| the frequency marked on a transducer indicates: a. the highest frequency produced buy the transducer b. the range of transducers operating frequency c. the center frequency at which the transducer operates | c. the center frequency at which the transducer operates |
| the measure of how a signal from a defect compared to other background reflections is called: a. refraction b. signal to noise ratio c. reflection d. acoustic impedance | b. signal to noise ratio |
| in order to have a reasonable chance at detecting a discontinuity, the reflexive surface of the discontinuity music have a dimension that is at least as long as ________ wavelength a. one-half b. one-quarter c. two d. one | a. one-half |
| mode conversion occurs when a sound wave encounters an interface between material of different acoustic impedance and: a. one of the two materials in a liquid b. the incident angle is greater than the first critical angle c. the incident angle is not normal to the interface | c. the incident angle is not normal to the interface |
| when an ultrasound wave passes through an interface between two materials at an oblique angle, and the materials have different indices of reaction, it produces: a. reflected waves b. refracted waves c. both | c. both (reflected and refracted waves) |
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