ASNT Level 1 UT Questions and Answers Already Passed

ASNT Level 1 UT Questions and Answers Already Passed 1. The indication on the instrument display that represents the far boundary of material being tested is called: the back-surface reflection. 2. In immersion testing, the position of the transducer is often varied by a manipulator to transmit sound into the test part at various angles to the front surface. Such a procedure is referred to as: angulation. 3. The technical name for the cable that connects the ultrasonic instrument to the transducer is: coaxial cable 4. The process of standardizing an instrument or device by using a reference standard is called: calibration. 5. Another name for a compressional wave is: longitudinal wave. 6. Another name for rayleigh waves is : surface waves. 7. A material used between the face of a transducer and the test surface to permit or improve the transmission of ultrasonic vibrations from the transducer to the material being tested is called: a couplant. 8. The piezoelectric material in a transducer that vibrates to produce ultrasonic waves is called a crystal. 9. Ultrasonic testing of material where the probe is in direct contact with the material being tested may be: straight beam testing. 10. An advantage of using lithium sulfate in transducers is that it: is one of the most efficient receivers of ultrasonic energy 12. The transducer that contains the thinnest piezoelectric crystal is a: 25 MHz transducer 13. Penetration of ultrasonic waves in a material is normally the function of test frequency used. The greatest depth of penetration is provided by a frequency of 1 MHz 14. The amount of beam divergence from a crystal is primarily dependent on the frequency and crystal size. 15. 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. 21. The velocity of longitudinal waves is approximately __________ the velocity of shear waves in the same material. two times 27. Under most circumstances, which of the following frequencies would result in the best resolving power? 25 MHz 28. Which of the following materials of the same alloy is most like ly to produce the greatest amount of sound attenuation over a given distance? A coarse-grained casting. 29. In contact testing, the entry surface indication is sometimes referred to as the: initial pulse.