Acoustic Emission Testing (AE) Review Questions

Question 1

The most common range of acoustic emission testing is:
A. 10-15 kHz
B. 100 - 300 kHz
C. 500-750 kHz
D. 1-5 MHz

Answer 1

B. 100 - 300 kHz

Question 2

Discontinuities that are not readily detectable by acoustic emission testing are:
A. Leaks.
B. Plastic deformation.
C. Growing cracks.
D. Rounded inclusions.

Answer 2

D. Rounded inclusions.

Question 3

The total energy loss of a propagating wave is called:
A. Scatter
B. Dispersion
C. Diffraction.
D. Attenuation

Answer 3

D. Attenuation

Question 4

The Kaiser effect refers to:
A. Velocity changes due to temperature change
B. Low amplitude emissions from aluminum structures
C. The behavior where emission from a source will not occur until the previous load is exceeded.
D. Emission from dissimilar material interfaces

Answer 4

C. The behavior where emission from a source will not occur until the previous load is exceeded.

Question 5

The felicity effect is useful in evaluating:  
A. Fiber-reinforced plastic components
B. High alloy casings
C. Large structural steel members
D. Ceramics

Answer 5

A. Fiber-reinforced plastic components

Question 6

The kaiser effect is useful in distinguishing:
A. Electrical noise from mechanical noise.
B. Electrical noise from growing discontinuities.
C. Mechanical noise from growing discontinuities.
D. Electrical noise from continuous emissions.

Answer 6

C. Mechanical noise from growing discontinuities.

Question 7

The term “counts” refers to the:
A. Number of times a signal crosses a preset threshold.
B. Number of events from a source.
C. Number of transducers required to perform a test.
D. Duration of hold periods.

Answer 7

A. Number of times a signal crosses a preset threshold.

Question 8

The acoustic emission signal amplitude is related to:
A. The preset threshold.
B. The intensity of the source.
C. The band pass filters.
D. Background noises.

Answer 8

B. The intensity of the source.

Question 9

Threshold settings are determined by the:
A. Graininess of the material.
B. Attenuation of the material.
C. Test duration.
D. Background noise level

Answer 9

D. Background noise level

Question 10

Background noise can be reduced by:
A. Electronic filtering
B. Using flat response amplifiers
C. Using in-line amplifiers
D. Using heavier gage coaxial cabling

Answer 10

A. Electronic filtering