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EPRI-UT-1

QuestionAnswer
"1.The reference holes in standard area-amplitude ultrasonic test blocks contain: A. flat-bottomed holes. B. concave-surface holes. C. convex-surface holes. D. side-drilled holes. " "A. flat-bottomed holes."
"2.The gradual loss of sonic energy as the ultrasonic vibrations travel through the material is referred to as: A. Reflection B. Refraction C. Mode conversion D. Attenuation " D. Attenuation
"3.A term for many small indications on the CRT bottom from test part structure, numerous small discontinuities, or both is often referred to as: A. Multiple back reflections B. Multiple front reflections C. Grass D. Resonance " C. Grass
"4. When testing a plate, increasing the frequency of an ultrasonic longitudinal wave will result in: A. an increase in its velocity. B. a decrease in its velocity. C. no change in its velocity. D. an increase in penetration. " "C. no change in its velocity."
"4. When testing a plate, increasing the frequency of an ultrasonic longitudinal wave will result in: A. an increase in its velocity. B. a decrease in its velocity. C. no change in its velocity. D. an increase in penetration. " "C. no change in its velocity."
"5. Ultrasonic waves transmitted into and received from the test material in the form of repetitive bursts 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"
"6. Metal blocks which contain one or more drilled holes to simulate discontinuities are called: A. DAC blocks B. Crystal collimators C. Single plane angulators D. Reference standards " "D. Reference standards"
"7. If a 3"" discontinuity in a 6"" thick plate lies parallel to the entry surface , it will be best detected by: A. a straight beam test. B. an angle beam test. C. a surface wave test. D. a lamb wave test. " A. a straight beam test.
"8. The depth of a discontinuity cannot be determined when using: A. Straight beam testing method. B. Through transmission testing method. C. Angle beam testing method. D. Immersion testing method. " B. Through transmission testing method.
"9. When inspecting coarse-grained material, which frequency will generate a scattered sound wave in the grain structure? A. 1.0 MHz B. 2.25 MHz C. 5.0 MHz D. 10 MHz " " D. 10 MHz "
"10. Which of the following search units would contain the thickest crystal? A. A 1 megahertz search unit. B. A 5 megahertz search unit. C. A 15 megahertz search unit. D. A 25 megahertz search unit. " "A. A 1 megahertz search unit. "
"11. When performing a surface wave test, indications may result from: A. Surface discontinuities B. Oil on the surface C. Dirt on the surface D. All three of the above " "A. Surface discontinuities B. Oil on the surface C. Dirt on the surface D. All three of the above"
"12. Search units with a plastic wedge or standoff between the transducer element and the test piece are used for: A. Straight beam contact testing. B. Angle beam contact testing. C. Surface wave contact testing. D. All of the above. " " A. Straight beam contact testing. B. Angle beam contact testing. C. Surface wave contact testing. D. All of the above. "
"13. A search unit containing three or more individual transducer elements is often referred to as a: A. Dual transducer B. Sandwich transducer C. Mosaic transducer D. Multi-element transducer " "C. Mosaic transducer "
"14. Sound can be focused by means of special curved adapters located in front of the transducer element. These adapters are referred to as: A. Scrubbers B. Acoustic lenses C. Angle beam adapters D. Single plane adapters " "B. Acoustic lenses "
"15. 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 "
"16. A separate time base line imposed on the viewing screen of some flaw detectors that permits measurement of distances is called: A. An initial pulse B. A time/distance line C. A marker or gate D. Through transmission testing " "C. A marker or gate "
"17. The ability of an ultrasonic testing system to distinguish between the entry surface response and the response of discontinuities near the entry surface is: A. Sensitivity B. Penetration C. Segregation D. Resolution " " D. Resolution "
"18. The phenomenon whereby an ultrasonic wave changes direction when the wave crosses a boundary between materials with different velocities is called: A. Refraction B. Reflection C. Penetration D. Rarefaction " "A. Refraction "
"19. In a test where the transducer is not perpendicular to the inspection surface, the angle of incidence is equal to: A. The angle of refraction. B. The angle of reflection. C. The shear wave angle. D. The angle of rarefaction. " "B. The angle of reflection. "
20. In a material: the velocity of sound * material density gives the amount of reflection or transmission of sound at an interface. Normally called: A. Acoustic impedance B. Velocity C. Wave length D. Penetration "A. Acoustic impedance "
"21. Ultrasonic waves that travel along the surface of a material and whose particle motion is elliptical are called: A. Shear waves B. Transverse waves C. Longitudinal waves D. Rayleigh waves " "D. Rayleigh waves "
"22. The interference field near the face of a transducer is often referred to as the: A. Fresnel zone. B. Acoustic impedance. C. Exponential field. D. Phasing zone. " " A. Fresnel zone. "
"23. When the incident angle is chosen to be between the first and second critical angles, the ultrasonic wave mode within the part will be a: A. Longitudinal wave B. Shear wave C. Surface wave D. Lamb wave " "B. Shear wave "
"24. 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 "
"25. In a material with a given velocity, when frequency is increased, the wavelength will: A. Not be effected B. Increase C. Decrease D. Double " "C. Decrease "
"26. Which circuit increases the return signal magnitude from transducer and modifys the signals to display? A. Pulser circuits B. DAC circuits C. Timer circuits D. Receiver-amplifier circuits " D. Receiver-amplifier circuits
"27. What is the most common type of data display used for ultrasonic examination of welds? A. An A-scan display B. A B-scan display C. A C-scan display D. An x-y plot " "A. An A-scan display "
"28. Which is a plot of signal amplitude versus time? A. An A-scan display B. A B-scan display C. A C-scan display D. None of the above " "A. An A-scan display "
"29. Which circuit generates a burst of energy which is applied to the sending transducer? A. Pulser B. Receiver-amplifier C. Damping D. Clock " " A. Pulser "
"30. Which circuit coordinates operation of the entire ultrasonic instrument system? A. Damping B. Receiver-amplifier C. Clock D. Power supply " "C. Clock "
"31. A plan view display or recording of a part under examination is called: A. An A-scan presentation. B. A B-scan presentation. C. A C-scan presentation. D. An X-Y plot. " "C. A C-scan presentation. "
"32. Ultrasonic data which is presented in a form representative of the cross-section of the test specimen is called: A. An A-scan presentation. B. A B-scan presentation. C. A C-scan presentation. D. An X-Y plot. " "B. A B-scan presentation. "
"33. What type of ultrasonic examination uses wheel-type search units to eliminate the use of a tank? A. Through transmission testing. B. Contact testing. C. Resonance testing. D. Immersion testing. " "D. Immersion testing. "
34. In immersion testing, to verify the search unit is normal to a flat entry surface is indicated by: A. Maximum reflection of the entry surface B. Elimination of water multiples C. Proper wavelength D. Maximum amplitude of initial pulse A. Maximum reflection of the entry surface
"35. Natural quartz crystal disadvantage in a search unit is that: A. It is water soluble. B. There are better UT generating materials. C. It is mechanically and electrically unstable. D. It loses operating characteristics with ages. " B. There are better UT generating materials.
37. When testing by the surface wave method, patches of oil or dirt on the surface may: A. Block all sound. B. Attenuate the sound. C. Have no effect on the test. D. Cause both an attenuation of sound and indications on the screen. " C. Obtain a common reproducible signal. "
"38. In immersion testing, the most commonly used couplant is: A. Water B. Oil C. Glycerine D. Alcohol " "A. Water "
"39. Which of the following frequencies will produce the shortest wavelength pulse? A. 1.0 megahertz B. 25 megahertz C. 10 megahertz D. 5 megahertz " "B. 25 megahertz "
"40. ""100,000 cycles per second"" can be written: A. 10 kilohertz B. 100 kilohertz C. 100 MHz D. 0.1 kilohertz. " "B. 100 kilohertz "
Created by: urbergpm9276