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- Question 1 of 40
1. Question
The only significant sound wave mode that travels through a liquid is a:
CorrectIncorrect - Question 2 of 40
2. Question
The acoustic impedance of a material is used to determine the:
CorrectIncorrect - Question 3 of 40
3. Question
When angle beam contact testing a test piece, increasing the incident angle until the second critical angle is reached results in:
CorrectIncorrect - Question 4 of 40
4. Question
The random distribution of crystallographic direction in alloys with large crystalline structures is a factor in determining:
CorrectIncorrect - Question 5 of 40
5. Question
The length of the zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly affected by:
CorrectIncorrect - Question 6 of 40
6. Question
The differences in signals received from identical reflectors at different material distances from a transducer may be caused by:
CorrectIncorrect - Question 7 of 40
7. Question
In the far field of a uniform ultrasonic beam, sound intensity is ___________ the beam centerline.
CorrectIncorrect - Question 8 of 40
8. Question
As the radius of curvature of a curved lens is increased, the focal length of the lens:
CorrectIncorrect - Question 9 of 40
9. Question
Rayleigh waves are influenced most by defects located:
CorrectIncorrect - Question 10 of 40
10. Question
The ultrasonic testing technique in which finger damping is most effective in locating a discontinuity is the:
CorrectIncorrect - Question 11 of 40
11. Question
At an interface between two different materials, an impedance difference results in:
CorrectIncorrect - Question 12 of 40
12. Question
In the immersion technique, the distance between the face of the transducer and the test surface (water path) is usually adjusted so that the time required to send the sound beam through the water:
CorrectIncorrect - Question 13 of 40
13. Question
On an A-scan display, the “dead zone,” refers to:
CorrectIncorrect - Question 14 of 40
14. Question
In straight (normal) beam contact testing, a reduction in the back surface reflection amplitude could indicate:
CorrectIncorrect - Question 15 of 40
15. Question
A primary purpose of a reference standard is:
CorrectIncorrect - Question 16 of 40
16. Question
Compensation for the variation in echo height related to variations in discontinuity depth in the test material is known as:
CorrectIncorrect - Question 17 of 40
17. Question
Which of the following is a reference reflector that is not dependent on beam angle?
CorrectIncorrect - Question 18 of 40
18. Question
The angle at which 90 degrees refraction of a longitudinal sound wave is reached is called:
CorrectIncorrect - Question 19 of 40
19. Question
Attenuation is a difficult quantity to measure accurately, particularly in solid materials, at the test frequencies normally used. The overall result usually observed includes other loss mechanisms which can include:
CorrectIncorrect - Question 20 of 40
20. Question
The vertical linear range of a test instrument may be determined by obtaining ultrasonic responses from:
CorrectIncorrect - Question 21 of 40
21. Question
Large grains in a metallic test specimen usually result in:
CorrectIncorrect - Question 22 of 40
22. Question
The angle formed by an ultrasonic wave as it enters a medium of different velocity than the one from which it came and a line drawn perpendicular to the interface between the two media is called the angle of:
CorrectIncorrect - Question 23 of 40
23. Question
The process of adjusting an instrument or device to a reference standard is referred to as:
CorrectIncorrect - Question 24 of 40
24. Question
An electron tube in which a beam of electrons from the cathode is used to reproduce an image on a display at the end of the tube is referred to as:
CorrectIncorrect - Question 25 of 40
25. Question
A grouping of a number of crystals in one transducer, with all contact surfaces in the same plane, and vibrating in phase with each other to act as a single transducer is called a:
CorrectIncorrect - Question 26 of 40
26. Question
The angle of reflection is
CorrectIncorrect - Question 27 of 40
27. Question
The change in direction of an ultrasonic beam when it passes from one medium to another whose velocity differs from that of the first medium is called:
CorrectIncorrect - Question 28 of 40
28. Question
Which of the following modes of vibration exhibits the shortest wavelength at a given frequency and in a given material?
CorrectIncorrect - Question 29 of 40
29. Question
In general, shear waves are more sensitive to small discontinuities than longitudinal waves for a given frequency and in a given material because:
CorrectIncorrect - Question 30 of 40
30. Question
The speed with which ultrasonic waves travel through a material is known as its
CorrectIncorrect - Question 31 of 40
31. Question
A substance that reduces the surface tension of a liquid is referred to as:
CorrectIncorrect - Question 32 of 40
32. Question
The ultrasonic transducers most commonly used for discontinuity testing utilize:
CorrectIncorrect - Question 33 of 40
33. Question
Mechanical and electrical stability, insolubility in liquids, and resistance to aging are three advantages of transducers made of:
CorrectIncorrect - Question 34 of 40
34. Question
The formula sin θ1/V1 = sin θ2/V2 is used to determine:
CorrectIncorrect - Question 35 of 40
35. Question
The amount of energy reflected from a discontinuity is dependent on:
CorrectIncorrect - Question 36 of 40
36. Question
Which of the following frequencies would probably result in the greatest ultrasonic attenuation losses?
CorrectIncorrect - Question 37 of 40
37. Question
The product of the sound velocity and the density of a material is known as the:
CorrectIncorrect - Question 38 of 40
38. Question
The amplifier range over which the unsaturated signal response increases in amplitude in proportion to the discontinuity surface area is the
CorrectIncorrect - Question 39 of 40
39. Question
Significant errors in ultrasonic thickness measurement can occur if:
CorrectIncorrect - Question 40 of 40
40. Question
An ultrasonic testing instrument that displays pulses representing the magnitude of reflected ultrasound as a function of time or depth of metal is said to contain:
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