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2. High amplitude events during the examination of fiberglass-reinforced pressure (FRP) vessels usually indicates:

a. fiber breakage

b. debonding

c. fiber pullout

d. micro cracking

When an elastic material is stretched elastically, the stress is:

a. greater than the strain

b. less than the strain

c. proportional to the strain

d. equal to the strain

1. According to Table T-1121 of ASME Section V, Article 11 (below), how much time must a pressure vessel, normally operated at 414 kPa (60 psig), be operated at 207 kPa (30 psig) before acoustic emission examination?

a. 12 hours

b. 30 hours

c. 2 days

d. 4 days

Which of the following terms means a material’s ability to resist crack growth?

a. ductility

b. toughness

c. hardness

d. resistance

A particular accelerometer has a resonant frequency of 30 kHz. When used to detect acoustic emission, it “rings” at this resonant frequency. The time between successive peaks (period) is:

a. 30 milliseconds

b. 33.3 milliseconds

c. 30 microseconds

d. 33.3 microseconds

Detection of an acoustic emission signal depends on:

a. duration of the signal exceeding the instrument dead time

b. amplitude of the signal exceeding the threshold

c. rise time of the signal exceeding the lockout time

d. frequency spectrum of the signal exceeding the system bandwidth

A limitation of the acoustic emission applied to metals is that it:

a. is not immediately repeatable

b. can only find defects that break the surface

c. requires vessels to be taken out of service for the test

d. requires personnel to be close to vessels at high pressures

A major benefit of the acoustic emission method is that it:

a. finds smaller cracks than any other method

b. is readily repeatable

c. produces superior images of defects in thick- section steels

d. requires access to the structure only at the sensor locations

MARSE is:

a. the Mean Acoustic Ringdown Signal Envelope

b. useful as a measure of continuous noise

c. often observed to increase with increasing load in tests of damaged structures

d. all of the above

10.

The concept that all, or nearly all, materials are capable of generating acoustic emission was first set forth in 1950 by:

a. Dunegan

b. Parry

c. Kaiser

d. Johnson

11.

A typical source mechanism of acoustic emission is:

a. crack growth

b. movement of dislocations

c. matrix cracking in fiber-reinforced plastics

d. all of the above.

12.

The Felicity ratio is a quantitative measure best used to evaluate:

a. carbon steel reactors

b. stainless steel piping

c. fiberglass vessels and storage tanks

d. 7075 aluminum aircraft structures

13.

When selecting the best sensor frequency for a particular acoustic emission test, it is important to consider all of the following except:

a. attenuation characteristics of the material

b. frequency spectrum and level of background noise

c. cable length

d. sensor spacing

14.

After an initial proof test, a defect grows during a year in service. Acoustic emission can often detect this defect during a second proof test. Dunegan’s reasoning for this phenomena is that the:

a. second proof test will be done at a higher load

b. Kaiser effect will disappear after one year

c. local stress field around the defect will be higher during the second proof test

d. Kaiser effect does not apply to flawed materials

15.

The positioning of sensors for acoustic emission testing of metal pressure vessels is commonly based on:

a. the measured attenuation in the structure

b. the need to detect structural flaws at critical locations

c. the velocity of sound in the structure

d. both a and b.

16.

Of the following components, which one is not considered to be part of a typical acoustic emission sensor?

a. electrodes

b. active element

c. acoustic waveguide

d. backing material

17.

When performing source location, which of the following most directly affects the accuracy of computed location?

a. accuracy of sensor placement

b. physical size of a sensor

c. sensor frequency

d. sensor couplant

18.

In acoustic emission testing of fiberglass-reinforced pressure (FRP) tanks and pressure vessels, significant activity on low-frequency sensors and very little activity on high-frequency sensors normally indicate:

a. poor, high-frequency sensor location

b. high amplitude, low-frequency emissions

c. fiber breakage

d. crazing

19.

In acoustic emission testing of fiberglass-reinforced pressure (FRP) tanks and pressure vessels, low-frequency sensors are used for:

a. culminating spurious noise sources

b. low-temperature environments

c. examinations using cables over 91 m (300 ft)

d. backing up the high-frequency sensors

20.

Which of the following factors tend to increase the amplitude of the acoustic emission response?

a. low-strength material

b. small grain size

c. absence of discontinuities

d. high strain rates

21.

If a crack is detected by AE during a pressure test, how can its existence be verified using AE?

a. repeat the same loading

b. monitor during a load hold at 50% of the maximum test pressure

c. load to a pressure slightly higher than the previous maximum test load

d. monitor during a load at 25% of the maximum text pressure

22.

If rain starts falling on an uninsulated vessel during an AE test and produces significant background noise, the AE test operator should:

a. speed up the test

b. pause the test until the rain lets up enough or stops

c. conclude the test and call the current load, 100% maximum test load

d. continue the test and perform filtering of the background during the analysis

23.

AE generated during proof testing when the load is between the service load and the maximum proof load, is indicative of the damage experienced during the preceding working period. This is the basic idea put forth through:

a. the kaiser effect

b. the felicity effect

c. the Dunegan corollary

d. Rahman scattering theory

24.

Attenuation in metals is due primarily to:

a. geometric beam spreading

b. material damping

c. a and b

d. beam refraction

25.

AE produced by a liquid leaking through a valve is due primarily to:

a. turbulence

b. cavitation

c. a and b

d. none of the above

26.

An additional source of background noise that is sometimes detected during AE testing of in-service metal storage tanks is:

a. active corrosion

b. overhead power lines

c. highway traffic

d. railroad traffic

27.

What is the main difference in testing spheres as compared to bullets and drums?

a. the size and shape

b. the liquid loading experienced by the sphere

c. a and b

d. spheres require minimal sensor placement

28.

AE testing of in-service vessels is aimed primarily at detecting service-related cracking. This cracking may be a result of:

a. stress corrosion cracking (SCC)

b. sulfide stress cracking (SSC)

c. fatigue cracking

d. all of the above

29.

The size, shape, and orientation of defects detected by AE testing, are usually determined by:

a. size is estimated by the number of ringdown counts

b. orientation can be assumed to be normal to the hoop direction

c. shape can always be assumed to be like a “half a penny”

d. follow-up nondestructive testing

30.

When testing in-service pressure vessels, the maximum test load is commonly based on the maximum operating pressure experienced:

a. in the last one or two months of operation

b. in the last six or 12 months of operation

c. in the last 10 years of operation

d. over the life of the vessel

31.

Why is it wise to start an AE test for an in-service pressure vessel at a load lower than required?

a. to determine that the loading rate is sufficient

b. to verify that the AE instrument is operating satisfactorily

c. the maximum operating pressure may be uncertain and AE from SCC occurs within a few percent of this value

d. all of the above

32.

During continuous monitoring of pressure boundaries, AE sources are stimulated by:

a. special cyclic loading

b. normal system operating conditions

c. over-pressurization

d. all of the above

33.

During continuous monitoring of pressure boundaries per ASTM E 1139, AE system operation and data interpretation should be verified by a qualified AE specialist:

a. once a month

b. once a year

c. every six months

d. only when there are signs of the system malfunctioning

34.

During continuous monitoring of pressure boundaries per ASTM E 1139, a 0.3 mm, 2H pencil lead break at a distance of 300 mm (12 in.) should produce a signal-to-noise ratio of

a. 1 to 1

b. 2 to 1

c. 3 to 1

d. 4 to 1

35.

During continuous monitoring of pressure boundaries, signal detection sensitivity should be evaluated during normal operation:

a. by using a spring-loaded center punch

b. by tapping the pressure boundary with a light hammer

c. by using pencil lead breaks as a signal source

d. by using a 7 mm pencil lead break 3.05 m (10 ft) from the sensor

36.

During continuous monitoring of pressure boundaries, the distance at which an AE source can be detected is maximized by using a recommended low monitoring frequency of:

a. 10 kHz to 20 kHz

b. 20 kHz to 60 kHz

c. 50 kHz to 100 kHz

d. 200 kIIz to 400 kHz

37.

During continuous monitoring of pressure boundaries, an AE system can perform leak detection if:

a. it can measure the average signal level and/or AE RMS voltage at each channel

b. it can measure ring-down counts

c. it can measure the hit rate

d. it can measure signal duration above 500 kHz

38.

For continuous monitoring of pressure boundaries, source location can be performed using:

a. difference in Time of Arrival for multiple sensors

b. a “look up” table of At’s

c. signal difference

d. all of the above

39.

During continuous monitoring of pressure boundaries, leaks are indicated by

a. a sudden increase in the AE RMS signal level and a return back to the normal signal level

b. a 6 dB change in the average signal level lasting more than 5 seconds

c. a sustained increase in the AE RMS signal level from one or more sensors in a given sensor array

d. an increase in the noise level lasting more than 5 seconds

40.

What characteristic of a part best determines whether a test piece should be considered a large part or a small part for AE testing purposes?

a. a part is considered small when one load parameter will characterize the whole part

b. a part is considered small when attenuation factors do not need to be considered

c. if a waveguide is required to access the part, the part is considered small

d. a part is considered small if all pencil lead breaks made at any and all positions on the part can still be detected by a single sensor

41.

Of the following situations, which is the most appropriate for using only a single AE sensor?

a. in a small part where the sensor can be placed near the expected source of AE and where one or two known noises occur

b. in a large part where a single sensor can be used to locate AE sources because of the separation of fast and slow wave modes

c. in a small part with no known noise sources and where the sensor can be placed next to the expected source of AE

d. near multiple expected sources of AE, provided there is no background noise present

42.

For checking zonal location sensitivity, what is the minimum number of AE sensors that shall detect a simulated source at any given position on the structure?

a. none

b. one

c. two

d. three or more

43.

When monitoring a source of AE, the acoustic activity (as measured by event count or emission count) does not increase with increasing stimuli. Which of the following classifications apply to this source?

a. inactive

b. active

c. critically active

d. intense

44.

When monitoring a source of AE, the acoustic activity (as measured by event count or emission count) increases with increasing stimuli. Which of the following classifications apply to this source? Note: for this question, the rate of acoustic activity is not increasing with increasing stimuli.

a. inactive

b. active

c. critically active

d. intense

45.

When monitoring a source of AE, the rate of acoustic activity (as measured by event count or emission count) increases with increasing stimuli. Which of the following classifications apply to this source?

a. inactive

b. active

c. critically active

d. intense

46.

46. When monitoring a source of AE, both of the following are found to be true: the acoustic activity (as measured by event count or emission count) increases with increasing stimuli; the intensity (as measured by average energy per event or average emission count per event or average amplitude per event) exceeds the average intensity by a fixed level.
Which of the following classifications should be used to describe this source?

a. inactive

b. active

c. critically active

d. intense

47.

While there are no set criteria for acceptable limits on sensor degradation, what levels of discrepancy warrant further action?

a. sensors that demonstrate loss of response of greater than 4 dB

b. sensors that demonstrate loss of response of greater than 6 dB

c. sensors that demonstrate loss of response of greater than 8 dB

d. sensors that demonstrate loss of response of greater than 10 dB

48.

High amplitude events during the examination of fiberglass-reinforced pressure (FRP) vessels usually indicate:

a. fiber breakage

b. debonding

c. fiber pullout

d. microcracking

49.

When an elastic material is stretched elastically, the stress is:

a. greater than the strain

b. less than the strain

c. proportional to the strain

d. equal to the strain

50.

A limitation of the acoustic emission method applied to metals is that it:

a. is not immediately repeatable

b. can only find defects that break the surface

c. requires vessels to be taken out of service for the test

d. requires personnel to be close to vessels at high pressures

51.

Which of the following terms means a material’s ability to resist crack growth?

a. ductility

b. toughness

c. hardness

d. resistance

52.

A limitation of the acoustic emission method applied to metals is that it:

a. is not immediately repeatable

b. can only find defects that break the surface

c. requires vessels to be taken out of service for the test

d. requires personnel to be close to vessels at high pressures

53.

A major benefit of the acoustic emission method is that it:

a. finds smaller cracks than any other method

b. is readily repeatable

c. produces superior images of defects in thick-section steels

d. requires access to the structure only at the sensor locations

54.

MARSE is:

a. the Mean Acoustic Ringdown Signal Envelope

b. useful as a measure of continuous noise

c. often observed to increase with increasing load in tests of damaged structures

d. all of the above

55.

The concept that all, or nearly all, materials are capable of generating acoustic emission was first set forth in 1950 by:

a. Dunegan

b. Parry

c. Kaiser

d. johnson

56.

A typical source mechanism of acoustic emission is:

a. crack growth

b. movement of dislocations

c. matrix cracking in fiber-reinforced plastics

d. all of the above

57.

The felicity ratio is a quantitative measure best used to evaluate:

a. carbon steel reactors

b. stainless steel piping

c. fiberglass vessels and storage tanks

d. 7075 aluminum aircraft structures

58.

When selecting the best sensor frequency for a particular acoustic emission test, it is important to consider all of the following except:

a. attenuation characteristics of the material

b. frequency spectrum and level of background noise

c. cable length

d. sensor spacing

59.

After an initial proof test, a defect grows during a year in service. Acoustic emission can often detect this defect during a second proof test. Dunegan’s reasoning for this phenomena is that the:

a. second proof test will be done at a higher load

b. kaiser effect will disappear after one year

c. local stress field around the defect will be higher during the second proof test

d. kaiser effect does not apply to flawed materials

60.

The positioning of sensors for acoustic emission testing of metal pressure vessels is commonly based on:

a. the measured attenuation in the structure

b. the need to detect structural flaws at critical locations

c. the velocity of sound in the structure

d. both a and b

61.

Of the following components, which one is A not considered to be part of a typical acoustic emission sensor?

a. electrodes

b. active element

c. acoustic waveguide

d. backing material

62.

When performing source location, which of the following most directly affects the accuracy of computed location?

a. accuracy of sensor placement

b. physical size of a sensor

c. sensor frequency

d. sensor couplant

63.

In acoustic emission testing of fiberglass-reinforced pressure (FRP) tanks and pressure vessels. significant activity on low-frequency sensors and very little activity on high frequency sensors normally indicate:

a. need to relocate high-frequency sensors

b. high amplitude, low-frequency emissions

c. fiber breakage

d. crazing

64.

In acoustic emission testing of fiberglass-reinforced pressure (FRP) tanks and pressure vessels, low-frequency sensors are used for:

a. eliminating spurious noise sources

b. low-temperature environments

c. examinations using cables over 91 m (300ft

d. backing up the high-frequency sensors

65.

Which of the following factors tends to increase the amplitude of the acoustic emission response?

a. low-strength material

b. small grain size

c. absence of discontinuities

d. high strain rates

66.

One of the two major differences in the acoustic emission method from other forms of NOT is that:

a. acoustic emission relies on visual interpretation of data

b. computers are used exclusively for analysis

c. the energy detected is radiated from the defect itself

d. transducers are used to gather data

67.

One advantage of using acoustic emission over other forms of NOT is that acoustic emission can:

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

b. be used to “size” a discontinuity in a material

c. determine material thicknesses

d. measure thermal gradients within a material

68.

Which of the following facilitates the transmission of acoustic waves into a typical sensor

a. couplant

b. active element

c. surface of the test object

d. damping material

69.

When should a system performance evaluation* be performed?
A performance evaluation in this case is a simulated AE, such as a pencil lead break, in the test structure to verify that the AE system registers the appropriate level of AE.

a. before testing

b. after testing

c. at random and unscheduled intervals, as deemed necessary by the AE inspector

d. all of the above

Question 1 of 69

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2. High amplitude events during the examination of fiberglass-reinforced pressure (FRP) vessels usually indicates:

When an elastic material is stretched elastically, the stress is:

Which of the following terms means a material’s ability to resist crack growth?

A particular accelerometer has a resonant frequency of 30 kHz. When used to detect acoustic emission, it “rings” at this resonant frequency. The time between successive peaks (period) is:

Detection of an acoustic emission signal depends on:

A limitation of the acoustic emission applied to metals is that it:

A major benefit of the acoustic emission method is that it:

MARSE is:

The concept that all, or nearly all, materials are capable of generating acoustic emission was first set forth in 1950 by:

A typical source mechanism of acoustic emission is:

The Felicity ratio is a quantitative measure best used to evaluate:

When selecting the best sensor frequency for a particular acoustic emission test, it is important to consider all of the following except:

After an initial proof test, a defect grows during a year in service. Acoustic emission can often detect this defect during a second proof test. Dunegan’s reasoning for this phenomena is that the:

The positioning of sensors for acoustic emission testing of metal pressure vessels is commonly based on:

Of the following components, which one is not considered to be part of a typical acoustic emission sensor?

When performing source location, which of the following most directly affects the accuracy of computed location?

In acoustic emission testing of fiberglass-reinforced pressure (FRP) tanks and pressure vessels, significant activity on low-frequency sensors and very little activity on high-frequency sensors normally indicate:

In acoustic emission testing of fiberglass-reinforced pressure (FRP) tanks and pressure vessels, low-frequency sensors are used for:

Which of the following factors tend to increase the amplitude of the acoustic emission response?

If a crack is detected by AE during a pressure test, how can its existence be verified using AE?

If rain starts falling on an uninsulated vessel during an AE test and produces significant background noise, the AE test operator should:

AE generated during proof testing when the load is between the service load and the maximum proof load, is indicative of the damage experienced during the preceding working period. This is the basic idea put forth through:

Attenuation in metals is due primarily to:

AE produced by a liquid leaking through a valve is due primarily to:

An additional source of background noise that is sometimes detected during AE testing of in-service metal storage tanks is:

What is the main difference in testing spheres as compared to bullets and drums?

AE testing of in-service vessels is aimed primarily at detecting service-related cracking. This cracking may be a result of:

The size, shape, and orientation of defects detected by AE testing, are usually determined by:

When testing in-service pressure vessels, the maximum test load is commonly based on the maximum operating pressure experienced:

Why is it wise to start an AE test for an in-service pressure vessel at a load lower than required?

During continuous monitoring of pressure boundaries, AE sources are stimulated by:

During continuous monitoring of pressure boundaries per ASTM E 1139, AE system operation and data interpretation should be verified by a qualified AE specialist:

During continuous monitoring of pressure boundaries per ASTM E 1139, a 0.3 mm, 2H pencil lead break at a distance of 300 mm (12 in.) should produce a signal-to-noise ratio of

During continuous monitoring of pressure boundaries, signal detection sensitivity should be evaluated during normal operation:

During continuous monitoring of pressure boundaries, the distance at which an AE source can be detected is maximized by using a recommended low monitoring frequency of:

During continuous monitoring of pressure boundaries, an AE system can perform leak detection if:

For continuous monitoring of pressure boundaries, source location can be performed using:

During continuous monitoring of pressure boundaries, leaks are indicated by

What characteristic of a part best determines whether a test piece should be considered a large part or a small part for AE testing purposes?

Of the following situations, which is the most appropriate for using only a single AE sensor?

For checking zonal location sensitivity, what is the minimum number of AE sensors that shall detect a simulated source at any given position on the structure?

When monitoring a source of AE, the acoustic activity (as measured by event count or emission count) does not increase with increasing stimuli. Which of the following classifications apply to this source?

When monitoring a source of AE, the acoustic activity (as measured by event count or emission count) increases with increasing stimuli. Which of the following classifications apply to this source? Note: for this question, the rate of acoustic activity is not increasing with increasing stimuli.

When monitoring a source of AE, the rate of acoustic activity (as measured by event count or emission count) increases with increasing stimuli. Which of the following classifications apply to this source?

While there are no set criteria for acceptable limits on sensor degradation, what levels of discrepancy warrant further action?

High amplitude events during the examination of fiberglass-reinforced pressure (FRP) vessels usually indicate:

When an elastic material is stretched elastically, the stress is:

A limitation of the acoustic emission method applied to metals is that it:

Which of the following terms means a material’s ability to resist crack growth?

A limitation of the acoustic emission method applied to metals is that it:

A major benefit of the acoustic emission method is that it:

MARSE is:

The concept that all, or nearly all, materials are capable of generating acoustic emission was first set forth in 1950 by:

A typical source mechanism of acoustic emission is:

The felicity ratio is a quantitative measure best used to evaluate:

When selecting the best sensor frequency for a particular acoustic emission test, it is important to consider all of the following except:

After an initial proof test, a defect grows during a year in service. Acoustic emission can often detect this defect during a second proof test. Dunegan’s reasoning for this phenomena is that the:

The positioning of sensors for acoustic emission testing of metal pressure vessels is commonly based on:

Of the following components, which one is A not considered to be part of a typical acoustic emission sensor?

When performing source location, which of the following most directly affects the accuracy of computed location?

In acoustic emission testing of fiberglass-reinforced pressure (FRP) tanks and pressure vessels. significant activity on low-frequency sensors and very little activity on high frequency sensors normally indicate:

In acoustic emission testing of fiberglass-reinforced pressure (FRP) tanks and pressure vessels, low-frequency sensors are used for:

Which of the following factors tends to increase the amplitude of the acoustic emission response?

One of the two major differences in the acoustic emission method from other forms of NOT is that:

One advantage of using acoustic emission over other forms of NOT is that acoustic emission can:

Which of the following facilitates the transmission of acoustic waves into a typical sensor

When should a system performance evaluation* be performed? A performance evaluation in this case is a simulated AE, such as a pencil lead break, in the test structure to verify that the AE system registers the appropriate level of AE.

Are You Looking for a Free ASNT NDT AE Level 2 Exam Practice Test?

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When should a system performance evaluation* be performed?
A performance evaluation in this case is a simulated AE, such as a pencil lead break, in the test structure to verify that the AE system registers the appropriate level of AE.