Acoustic Emission

Question 1

Hold periods at high loads during fiberglass reinforced pressure vessel examinations using ASME article 11 are necessary to

A. Calculate the felicity
B. Check for leaks
C. Monitor continuing damage
D. Measure the Kaiser ratio

Answer 1

C. Monitor continuing damage

Question 2

In acoustic emission testing. ASME section 5, article 11, sensor spacing on fiberglass reinforced pressure vessels is governed by:
A. The test article temperature
B. Sensor diameter
C. Attenuation 
D. The type of couplant

Answer 2

C. Attenuation

Question 3

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

A. Apply extra coupling around the sensor
B. Use heavy-duty fasteners on sensors and cables
C. Measure the peak amplitude response from a simulated acoustic emission source
D. Use acoustic waveguides

Answer 3

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

Question 4

The source of the energy of the acoustic emission wave during crack growth is the:
A. Acoustic emission sensor
B. Surface energy of the new crack
C. Elastic stress field in the structure
D. Power supply from the mainframe to the preamplifier

Answer 4

C. Elastic stress field in the structure

Question 5

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

A. In rushing fluid
B. Wind
C. Radio transmissions
D. All of the above

Answer 5

D. All of the above

Question 6

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

A. transformation
B. acoustic emission
C. brittle fracture
D. Isotropy

Answer 6

B. acoustic emission

Question 7

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

A. Acoustic emission relies on visual interpretation of data
B. computers are used exclusively for analysis
C. the energy detected is radiant from the defect itself D transducers are used to gather data

Answer 7

C. the energy detected is radiant from the defect itself

Question 8

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

A. be used to evaluate an entire structure during one test
B. Be used to size it discontinuity in a material
C. Determine material thicknesses
D. measure thermal gradients within a material

Answer 8

A. be used to evaluate an entire structure during one test

Question 9

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:

A. Dune game Corollary
B. The Kaiser effect
C. The felicity ratio
D. Hsu Nielsen source

Answer 9

B. The Kaiser effect

Question 10

The founder of modern acoustic emission testing was

A. Krieder
B. Firestone
C. Bolling
D. Kaiser

Answer 10

D. Kaiser

Question 11

The test most often performed on the structure to determine maximum center spacing is called:

A. Flaw detection test
B. Attenuation test
C. EMI test
D. Kaiser test

Answer 11

B. Attenuation test

Question 12

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

A. protection for the sensor
B. Ground loop elimination
C. A medium through which elastic stress waves can excite an acoustic emissions sensor
D. None of the above

Answer 12

C. A medium through which elastic stress waves can excite an acoustic emissions sensor

Question 13

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

A. The initial system calibration was invalid
B. The vessel is undergoing local yielding due to high secondary stresses
C. Failure of the vessel is in pending
D. The level of background noise has increased

Answer 13

C. Failure of the vessel is in pending

Question 14

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

A. directly on the AE source
B. anywhere in the general vicinity of the AE source
C. as far from the AE source as possible
D. At a standard distance from the AE source

Answer 14

B. anywhere in the general vicinity of the AE source

Question 15

Which of the following is measured in meters per second

A. The time required for a crack to grow
B. The resonant frequency of a material
C. The velocity of sound in a given material
D. The rate of strain when a material is being deformed

Answer 15

C. The velocity of sound in a given material

Question 16

A sensor is positioned 3 m from a acoustic emission source. If a particular component of the AE wave travels at 300 m/s, how long will it take this component to travel from source to censor?

A 1 ms
B. 3 ms
C. 9 ms
D. 1000 ms

Answer 16

A 1 ms

Question 17

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

A. acoustic emission relies on visual interpretation of data
B. Computers are used exclusively for analysis
C. Acoustic emission directly detects the growth of flaws
D. Transducers are used to gather data

Answer 17

C. Acoustic emission directly detects the growth of flaws

Question 18

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

A. Active element
B. Surface of the test object
C. Coupling
D. damping material

Answer 18

C. Coupling