Chris Wyatt
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NDT Acoustic Emission Testing (AE) Level I Review

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Chris Wyatt
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NDT Acoustic Emission Testing (AE) Level I

Question 1 of 14

1

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

Select one of the following:

  • burst emission.

  • acoustic emission signature.

  • acoustic emission signal.

  • continuous emission.

Explanation

Question 2 of 14

1

Attenuation of a wave is best defined by which statement?

Select one of the following:

  • A decrease in frequency with distance traveled.

  • A decrease in amplitude with distance traveled.

  • A decrease in wave speed with distance traveled.

  • A change in direction as a function of time.

Explanation

Question 3 of 14

1

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

Select one of the following:

  • response

  • count

  • count rate

  • energy

Explanation

Question 4 of 14

1

The most common frequency range of acoustic emission testing is:

Select one of the following:

  • 10-15 kHz.

  • 100-300 kHz.

  • 500-750 kHz.

  • 1-5 MHz.

Explanation

Question 5 of 14

1

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

Select one of the following:

  • leaks.

  • plastic deformation.

  • growing cracks.

  • rounded inclusions.

Explanation

Question 6 of 14

1

The total energy loss of a propagating wave is called:

Select one of the following:

  • scatter.

  • dispersion.

  • diffraction.

  • attenuation.

Explanation

Question 7 of 14

1

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

Select one of the following:

  • calculate the Felicity Ratio.

  • check for leaks.

  • monitor continued damage.

  • measure the Kaiser Ratio.

Explanation

Question 8 of 14

1

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

Select one of the following:

  • attenuation.

  • the test article temperature.

  • sensor diameter.

  • the type of couplant.

Explanation

Question 9 of 14

1

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

Select one of the following:

  • Apply extra couplant around the sensor.

  • Use heavy-duty fasteners on sensors and cables.

  • Measure the peak amplitude response from a simulated acoustic emission source.

  • Use acoustic waveguides.

Explanation

Question 10 of 14

1

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

Select one of the following:

  • acoustic emission sensor.

  • surface energy of the new crack.

  • elastic stress field in the structure.

  • power supply from the mainframe to the preamplifier.

Explanation

Question 11 of 14

1

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

Select one of the following:

  • In-rushing fluid.

  • Wind.

  • Radio transmissions.

  • All of the above.

Explanation

Question 12 of 14

1

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

Select one of the following:

  • transformation.

  • acoustic emission.

  • brittle fracture.

  • isotrophy.

Explanation

Question 13 of 14

1

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:

Select one of the following:

  • the Dunegan Corollary.

  • the Kaiser Effect

  • the Felicity Ratio

  • a Hsu-Nielsen source

Explanation

Question 14 of 14

1

The founder of modern acoustic emission technology was:

Select one of the following:

  • Conrad Earl Krieder.

  • Professor Firestone.

  • James C. Bolling

  • Josef Kaiser

Explanation

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