1.

The kaiser effect is useful in distinguishing:

2.

Which of the following methods of NDT requires leak proofing of casting before inspection?

3.

The term “counts” refers to the:

4.

Attenuation of a wave is best defined by which statement?

5.

Threshold settings are determined by the:

6.

The number of times the acoustic emission signal exceeds a preset threshold during any selected portion of a test is called the acoustic emission ______________.

7.

In order for an acoustic emission (AE) system to detect an active AE source in a material, the AE sensor must be placed:

8.

A sensor is positioned 3 m from an acoustic emission (AE) source. If a particular component of the AE wave travels at 3000 m/s, how long will it take this?

component to travel from source to sensor?

9.

What is an important wave mode in AE testing?

10.

During a pressure vessel test, there is a rapidly (exponentially) increasing count rate. There are several possible causes. The operator’s first priority is to examine the possibility that:

11.

The most common frequency range of acoustic emission testing is:

12.

The source of the energy of the acoustic emission wave during crack growth is the:

13.

One of the two major differences in the acoustic emission method from other forms of NDT is that

14.

What can AE not be used for?

15.

The acoustic emission signal amplitude is related to:

16.

How can an examiner be assured that proper contact has been made between the sensor and the vessel?

17.

The use of a couplant between the acoustic emission sensor and the surface of the material being tested is to provide:

18.

Which of the following can be a significant source of background noise?

19.

One advantage of using acoustic emission over other forms of NDT is that acoustic emission can:

20.

ASTM E 1139-02 applies to metal pressure boundaries in industrial systems such as:

21.

What generates the acoustic waves?

22.

In what acoustic frequency range works AE testing usually?

23.

What information should be recorded about background noise during a test?

24.

Hold periods at high loads during fiberglass-reinforced pressure (FRP) vessel examinations using ASME Article 11 are necessary to:

25.

One microvolt is the same as:

26.

Impact test for detection of defects in the casting is the most crude and unreliable method of non-destructive testing.

27.

The most common way of attaching AE sensors to carbon steel vessels that operate at low to medium temperatures is:

28.

What is a guard sensor?

29.

Raising the detection threshold (or lowering the gain) to reduce background noise is not desired because it can lead to:

30.

A qualitative description of the sustained signal level produced by rapidly occurring acoustic emission events is the accepted term for:

31.

The source of the energy of the acoustic emission wave during crack growth is the:

32.

Which of the following can be a significant source of background noise?

33.

Which of the following facilitates the transmission of acoustic waves to a typical sensor?

34.

How many transducers are used to record the acoustic waves?

35.

Hold periods at high loads during fiberglass-reinforced pressure (FRP) vessel examinations using ASME Article 11 are necessary to:

36.

In acoustic emission testing per ASME Section V, Article 11, sensor spacing on fiberglass-reinforced pressure (FRP) pressure vessels is governed by:

37.

The attenuation of a wave is best defined by which statement?

38.

What did Hsu-Nielsen invent?

39.

One of the major differences in the acoustic emission NDT method. compared to most other NDT methods is that:

40.

The Kaiser effect refers to:

41.

In non-destructive testing, sound test used is a very fine and accurate method of detecting flaws in the castings

42.

The felicity effect is useful in evaluating:

43.

What effect appears first when loading a material?

44.

Which of the following is recommended for monitoring and recording of the applied load in an AE test?

45.

The founder of modern acoustic emission technology was:

46.

What is the Kaiser effect?

47.

The most common artificial source of AE used to verify sensor coupling is:

48.

Which of the following is measured in meters per second (m/s)?

49.

The founder of modern acoustic emission technology was:

50.

During loading, a metallic structure emits throughout the test period. When the load is reduced and then reapplied, no emissions are noted until the previous stress level was exceeded. This phenomenon is an example of the:

51.

Discontinuities that are not readily detectable by acoustic emission testing are:

52.

Background noise can be reduced by:

53.

The elastic energy that is released by materials when they undergo deformation is called:

54.

The test most often performed on a structure to determine maximum sensor spacing is called:

55.

AE sensors may be mounted directly to painted surfaces if:

56.

During loading, a metallic structure emits throughout the test period. When the load is reduced and then reapplied, no emissions are noted until the previous stress level was exceeded. This is an example of:

57.

When should a waveguide be used in place of an adhesive for coupling an AE transducer to a text object?

58.

The signal amplitude (in decibels) is given as
A = 20 log10 (V/V0)- Gp
where:
v = Signal Amplitude at the preamp output, in microvolts
Vo = Reference Voltage= 1.0 ?V
Gp= Preamplifier Gain = 40 dB
What is the signal amplitude (in decibels) of an AE signal captured at the preamplifier output on an oscilloscope and measuring 1.0 V?

59.

What kind of signal is generated by a crack?

60.

How can an examiner be assured that proper contact has been made between the sensor and the vessel?

61.

The number of times the acoustic emission signal exceeds a preset threshold during any selected portion of a test is called the:

62.

The elastic energy that is released by materials when they undergo deformation is called:

63.

The total energy loss of a propagating wave is called:

64.

In acoustic emission testing per ASME Section V, Article 11, sensor spacing on fiberglass-reinforced pressure (FRP) vessels is governed by:

65.

A qualitative description of the sustained signal level produced by rapidly occurring acoustic emission events is the accepted definition for:

66.

The active element inside an AE sensor that senses surface displacements is usually: