ASNT Level 1 UT questions and answer 100%

ASNT Level 1 UT questions and answer 100%the back-surface reflection. 1. The indication on the instrument display that represents the far boundary of material being tested is called: angulation. 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: coaxial cable 3. The technical name for the cable that connects the ultrasonic instrument to the transducer is: calibration. 4. The process of standardizing an instrument or device by using a reference standard is called: longitudinal wave. 5. Another name for a compressional wave is: surface waves. 6. Another name for rayleigh waves is : a couplant. 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: crystal. 8. The piezoelectric material in a transducer that vibrates to produce ultrasonic waves is called a straight beam testing. 9. Ultrasonic testing of material where the probe is in direct contact with the material being tested may be: is one of the most efficient receivers of ultrasonic energy 10. An advantage of using lithium sulfate in transducers is that it: 25 MHz transducer 12. The transducer that contains the thinnest piezoelectric crystal is a: 1 MHz 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 frequency and crystal size. 14. The amount of beam divergence from a crystal is primarily dependent on the refraction. 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: two times 21. The velocity of longitudinal waves is approximately __________ the velocity of shear waves in the same material. 25 MHz 27. Under most circumstances, which of the following frequencies would result in the best resolving power? A coarse-grained casting. 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? initial pulse. 29. In contact testing, the entry surface indication is sometimes referred to as the: coarse-grained material. 30. An ultrasonic instrument display pattern containing a large number of low-level indications (often referred to as grass or hash) could be caused by: through-transmission testing 31. A test method employing two separate transducers on opposite surfaces of the material being tested is called frequency 32. The number of complete waves that pass a given point in a given period of time (usually 1 s) is referred to as the an interface. 33. The boundary between two different materials that are in contact with each other is called: longitudinal wave. 34. When the motion of the particles of a medium is transverse to the direction of propagation, the wave being transmitted is called a: 25 MHz. 36. The "25 milion eycles per second" can be stated number as: