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Description
Flashcards by Gamaliel Walker, updated more than 1 year ago
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Created by Gamaliel Walker
almost 7 years ago
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| Question | Answer |
| 1. The indication on the instrument display that represnts the far boundry of the material being tested is called: a. hash b. the initial pause c. the main bang d. the back surface reflection | d. the back surface reflection |
| 2. The cable that connects the ultrasonic instrument to the tranducer is specially desighned so that one conductor is centered inside another. The technical name for such a cable is: a. BX cable b. conduit c. coaxial cable d. ultrasonic conductor cable-grade 20 | c. coaxial cable |
| 3. The process of comparing an instrument or device with a standard is called: a. angulation b. calibration c. attenuation d. correlation | b. calibration |
| 4. Another name for Rayleigh waves is: a. shear waves b. longitudinal waves c. transverse waves d. surface waves | d. surface waves |
| 5. A material used between the faces of a transducer and the test surface to permit or improve the transmission of ultrasonic vibration from the transducer to the material being tested is called: a. a wetting agent b. a couplant c. an acoustic transmitter d. a lubricant | b. a couplant |
| 6. The piezoelectric material in a transducer that vibrates to produce ultrasonic waves is called a: a. backing material b. Lucite wedge c. crystal d. couplant | c. crystal |
| 7. In contact testing, the entry surface indication is sometimes referred to as: a. the initial pulse b. the back reflection c. the skip distance d. the scan path | a. the initial pulse |
| 8. An ultrasonic instrument display pattern containing a large number of low-level indications (often rrferred to as "hash") could be caused by: a. a crack b. a large inclusion c. coarse-grained material d. a gas pocket | c. coarse-grained material |
| 9. A test method employing two separate tranducers on opposite surfaces of the material being tested is called: a. contact testing b. surface wave testing c. through-transmission testing d. Lamb wave testing | c. through-transmission testing |
| 10. Moving a transducer over a test surface either manually or automatically is referred to as: a. scanning b. attenuating c. angulating d. resonating | a. scanning |
| 11. In immersion testing, the most commonly used couplant is: a. water b. oil c. glycerine d. alcohol | a. water |
| 12. The piezoelectric material in the transducer: a. converts electrical energy into sound b. converts electrical energy into mechanical energy c. eliminates the signal-to-noise energy d. produces high speed electrons in metals | b. converts electrical energy into mechanical energy |
| 13. The reference holes in standard aluminim area amplitude ultrasonic test blocks contain: a. flat bottom holes b. concave-surface holes c. convex-surface holes d. conical-shape holes | a. flat bottom holes |
| 14. Ultrasonic waves transmitted into and received from the test material in the form of repetitive burst of acoustic energy is called: a. pulse echo testing b. continuous wave testing c. resonance testing d. none of the above | a. pulse echo testing |
| 15. Metal blocks, which contain one or more drilled holes to simulate discontinuities, are called: a. scrubbers b. crystal collimators c. single plane angulators d. reference blocks | d. reference blocks |
| 16. The depth of a discontinuity cannot be determined when using the: a. straight beam testing method b. through-transmission testing method c. angle beam testing method d. immersion testing method | b. through-transmission testing method |
| 17. When performing a surface wave test, indications may result from: a. improper frequency b. oil on the surface c. a surface discontinuity d. the acoustical velocity of aluminum | c. a surface discontinuity |
| 18. Transducers constructed with a plastic wedge or standoff between the transducer element and the test piece are commonly used for: a. for angle beam contact testing b. for immersion testing c. to eliminate the need for couplant d. to reduce the speed of electrons | a. for angle beam contact testing |
| 19. Which of the following materials of the same alloy is most likely to produce the greatest amount of sound attenuation over a given distance? a. A hand forging. b. A coarse-grained casting. c. An extrusion. d. The attenuation is equal in all material. | b. A coarse-grained casting. |
| 20. When the motion of tje particles of a medium is parallel to the direction of propagation, the wave being transmitted is called a: a. longitudinal wave b. shear wave c. surface wave d. Lamb wave | a. longitudinal wave |
| 21. When the motion of the particles of a medium is transverse to the direction of propagation, the wave being transmitted is called a: a. longitudinal wave b. shear wave c. surface wave d. Lamb wave | c. surface wave |
| 22. When a vertical indication has reached the maximum signal height which can be displayed or viewed on the display of an ultrasonic instrument, the indication is said to have reached its: a. distance amplitude height b. absorption level c. vertical level d. limit of resolution | c. vertical level |
| 23. A test method in which the parts to be inspected are placed in a water bath or some other liquid couplant.is called: a. contact testing b. immersion testing c. surface wave testing d. through-transmission testing | b. immersion testing |
| 24. When the incident angle is chosen to be between the first and second angle critical angles, the ultrasonic wave mode within the partwill be a: a. longitudinal wave b. shear wave c. surface wave d. Lamb wave | b. shear wave |
| 25. The formula used to calculate the angle of refraction within a material is called: a. Fresnel's law b. Fraunhofer's law c. Snell's law d. Lamb's law | c. Snell's law |
| 26. A circuit that generates a burts of alterning voltage that is applied to the sending of the transducer is called a: a. pulsar b. receiver- amplifier c. damping d. clock | a. pulsar |
| 27. A type of data prestion most likely to be used with a high speed automatic scanning system is: a. an A-scan presentation b. a velocity versus amplitude plot c. a C-scan presentation d. a plot of echo height versus depth | c. a C-scan presentation |
| 28. What can cause nonrelevant indication on the cathode ray tube? a. contoured surfaces b. edge effects c. surface conditions d. all of the above | d. all of the above |
| 29. The proper interpretaion and evaluation of the presented defect signals are essential to any nondestructive test. A common method for the estimation of defect size is the use of: a. a double transducer test b. a piezoeletric standard c. mode conversion d. a reference standard | d. a reference standard |
| 30. Another name for Fresnel zone is: a. Fraunhofer zone b. near field c. far field d. Torrid zone | b. near field |
| 31. The velocity of sound in a material is dependent upon the: a. frequency of the wave b. wavelength c. material properties d. vibration cycle | c. material properties |
| 32. In immersion testing , a wetting agent is added to the water to: a. adjust the viscosity b. help eliminate the formation of bubbles c. prevent cloudiness d. none of the above. | b. help eliminate the formation of bubbles |
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