50 Question UT quiz

1. The total resistance that the cable presents to the electrical current passing through it is called:

2. When conducting a contact ultrasonic test, the hash, grass or irregular signals that appear in the CRT display of the area because:

3. In a basic ultrasonic test pattern (A-scan) for contact testing, the initial pulse (assume no sweep delay is used):

4. What type of transducer contains two independently operating elements in a single housing?

5. A test method employing two separate search units (probes) on opposite surfaces of the material being tested is called:

6. The acoustic impedance of materials is used to:

7. The sound that emanates from a piezoelectric transducer originates:

8. Less damped transducers will exhibit:

9. A term used in ultrasonics to express the speed at which sound waves pass through various substances is:

10. On an A-scan display the dead zone refers to:

11. Couplant displaces the__________ and makes it possible to get more sound energy into the test specimen.

12. The purpose of the backing material in a transducer is to:

13. Which of the following could influence the behavior of a transducer?

14. An ultrasonic test using a straight beam contact search unit (probe) is being conducted through the thickness of a flat part. This method is best for detecting:

15. Mode conversion, occurs when a sound wave encounters an interface between materials of different acoustic impedance and:

16. Snell’s Law describes the relationship between the sound velocity and:

17. The area in front of a transducer where there are extensive fluctuations in the sound field is called the:

18. In an ultrasonic instrument, the number of pulses produced by an instrument in a given period of time in known as the:

19. Which material properties affect the speed of sound within a material?

20. The gradual loss of sonic energy as the ultrasonic vibrations travel through the material is referred to as.:

21. Which of the following ultrasonic techniques require the probe to be held firmly against component?

22. When a longitudinal wave encounters an interface between two material with different accoustic impedances, what occurs when the

23. in ___________ ultrasonic waves are transmitted into the test material in the form of repetitive shock vibrations

24. When examining thin materials for planar discontinuities oriented parallel to the part surface, what testing method is most often used:

25. In a calibrated A-scan presentation, the horizontal base line represents:

26. Which of the following search units would contain the thinnest ceramic crystal?

27. The incident angle at which the transmitted longitudinal wave first ceases to exist in the refracting medium is the:

28. DAC stands for:

29. Surface or Rayleigh waves travelling along the surface of relative thick solid material, penetrate to a depth of approximately:

30. An ultrasonic testing technique in which the transducer (crystal) is at an angle to the test surface is called:

31. Which type of screen presentation displays the amount of received ultrasonic energy as a function of time?

32. The reason why you must ensure that a test object is thoroughly cleaned before ultrasonic inspection is.

33. The a large acoustic impedance mismatch at an interface will result in:

34. Three casting processes are:

35. A loss of reflected ultrasonic signal may be due to:

36. Which type of transducer can be used to scan wide areas when high sensitivity is not required?

37. Which of the following probes is most commonly used for testing welds for toe cracks:

38. Which probe will be used for critical examination in a forged component with a curved surface.:

39. The amount of beam divergence from a transducer (crystal) is primarily dependent on:

40. Of the following scan types, which one can be used to produce a recording of discontinuity areas superimposed over a plan view of the part.

41. A general term applied to all cracks, inclusions, blow holes etc, which cause a reflection of sonic energy is:

42. The minimum detectable defect size for a 5MHz probe in Aluminium (V = 6.3Km/s) is:

43. The frequency marked on a transducer indicates:

44. In the transverse or shear wave, the particles:

45. Resolution generally increases:

46. As transducer diameter decreases, the beam spread:

47. One of the most common applications of ultrasonic tests employing shear waves is:

48. Acoustic velocities are primarily determined by:

49. advantage of using ceramic in search units is:

50. Sound can propagate as:

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