AE Level 1 :: Acoustic Emission Testing MCQ's Part-1| Quiz Practice for ASNT/NDT Exam Questions

Non-Destructive Testing: Total 66′ Questions for Conduct of Examinations at NDT IRT Level-1. (Quiz Part-1 66′ .).

Acoustic Emission Testing Level -1 (AT) General Examination Quiz

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AT Level 1 :: NDT Acoustic Emission Testing MCQ’s Part-1

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

a) the test article’s temperature

b) sensor diameter

c) attenuation

d) the type of couplant

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

a) calculates the Felicity Ratio

b) check for leaks

c) monitor continued damage.

d) measure the Kaiser Ratio

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

The acoustic emission signal amplitude is related to:

a) The preset threshold

b) The intensity of the source.

c) The bandpass filters

d) Background noises

Attenuation of a wave is best defined by which statement?

a) A decrease in frequency with distance traveled

b) A decrease in amplitude with distance traveled.

c) A decrease in wave speed with distance traveled

d) A change in direction as a function of time

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

a) burst emission

b) acoustic emission signature

c) acoustic emission signal

d) continuous emission.

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

a) response

b) count.

c) count rate

d) energy

What is a guard sensor?

a) to discriminate from sources originating outside the area of interest.

b) to localize the position of an acoustic emission source

c) ontinuous signal

d) burst signal

Also Read: Introduction to Magnetic Particle Testing

The most common frequency range of acoustic emission testing is:

a) 10-15 kHz

b) 100-300 kHz.

c) 500-750 kHz

d) 1-5 MHz

10.

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

a) acoustic emission sensor

b) the surface energy of the new crack

c) elastic stress field in the structure

d) power supply from the mainframe to the preamplifier

11.

In order for an acoustic emission (AE) system to detect an active AE source in a 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

12.

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?

a) 1 millisecond.

b) 3 milliseconds

c) 9 milliseconds

d) 1000 milliseconds

13.

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

a) inrushing fluid

b) wind

c) radio transmissions

d) all of the above

14.

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

a) TRUE

b) FALSE

15.

One microvolt is the same as:

a) 0.001 v

b) 0.000001 v.

c) 10mV

d) 0.1mV

16.

What did Hsu-Nielsen invent?

a) an acoustic emission transducer

b) an aid to simulate an acoustic emission event.

c) a signal filter technique

d) o localize the position of an acoustic emission source

17.

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:

a) the Dunegan corollary

b) the Kaiser effect

c) the Felicity ratio

d) a Hsu-Nielsen source

18.

What is an important wave mode in AE testing?

a) longitudinal wave

b) transversal wave

c) Lamb wave.

d) efect location

19.

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

a) reduced genuine emissions

b) changes in the value of the AE signal features

c) fewer locatable AE events due to fewer hits being detected

d) all of the above.

20.

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?

a) 55 dB

b) 60 dB

c) SO dB .

d) 120 dB

21.

What effect appears first when loading a material?

a) the Kaiser effect.

b) the Felicity effect

c) n aid to simulate an acoustic emission event

d) a signal filter technique

22.

The use of a couplant between the acoustic emission 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 emission sensor.

d) none of the above

23.

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

a) the applied load should be monitored and recorded to the extent necessary to allow correlation to the AE data.

b) the applied load should be monitored so that it reaches a sufficient load level and may be recorded independently of the AE signal

c) the applied load may be checked at intervals during testing. If at any of these intervals, the load level is sufficiently above a pretest-specified target, that will be sufficient

d) an AE event must be recorded each time an applied load data is sampled and recorded

24.

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

25.

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

26.

AE sensors may be mounted directly to painted surfaces if:

a) the paint is smooth, not too thick, and well-bonded to the vessel surface.

b) the paint is oil-based

c) the paint is not lead-based

d) the paint has been adequately cured

27.

Also Read: IRT Level 1 :: Infrared Thermography Testing MCQ's Part-1| Quiz Practice for ASNT/NDT Exam Questions

What kind of signal is generated by a crack?

a) shock wave signal

b) continuous signal

c) burst signal.

d) he transducer

28.

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

a) pressure vessels

b) piping

c) other system components which serve to contain system pressure

d) all of the above.

29.

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

a) burst emission

b) acoustic emission signature

c) acoustic emission signal

d) continuous emission.

30.

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:

a) the Dunegan Corollary

b) the Kaiser Effect.

c) the Felicity Ratio

d) a Hsu-Nielsen source

31.

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

a) leaks

b) plastic deformation

c) growing cracks

d) rounded inclusions.

32.

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

a) Apply extra couplant 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

33.

The felicity effect is useful in evaluating:

a) Fiber-reinforced plastic components.

b) High alloy casings

c) Large structural steel members

d) Ceramics

34.

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

a) TRUE

b) FALSE

35.

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

36.

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

a) attenuation.

b) the test article temperature

c) sensor diameter

d) the type of complaint

37.

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

a) a capacitor

b) a piezoelectric crystal.

c) a strain gauge

d) an inductive coil

38.

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

39.

In what acoustic frequency range works AE testing usually?

a) 10 Hz – 100 KHz

b) 20 KHz to 1 MHz.

c) 20 KHz to 100 KHz

d) sing heavier gage coaxial cabling

40.

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

a) A decrease in frequency with distance traveled

b) A decrease in amplitude with distance traveled.

c) A decrease in wave speed with distance traveled

d) A change in direction as a function of time

41.

How many transducers are used to record the acoustic waves?

a) One and more transducers.

b) Always one transducer

c) Four transducers

d) Background noises

42.

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

a) apply extra couplant 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

43.

The founder of modern acoustic emission technology was:

a) Conrad Earl Krieder

b) Professor Firestone.

c) James C. Bolling

d) Josef Kaiser

44.

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

a) active element

b) surface of the test object

c) couplant.

d) damping material

45.

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

a) the magnitude of background noise at periodic intervals during the test, as the test circumstances allow

b) the times of any specific noise incidents

c) the effects of noise on the examination

d) all of the above.

46.

The founder of modern acoustic emission technology was:

a) Conrad Earl Krieder

b) Professor Firestone

c) James C. Bolling

d) Josef Kaiser

47.

Threshold settings are determined by the:

a) Graininess of the material

b) Attenuation of the material

c) Test duration

d) Background noise level.

48.

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

a) a spring-loaded center punch

b) a handful of small rocks thrown at the vessel wall

c) 0.3 mm, 2H mechanical pencil lead breaks.

d) 0.7 mm, 2H mechanical pencil lead breaks

49.

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:

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 impending.

d) the level of background noise has increased

50.

Also Read: Dye Penetration Testing - Advantages and Disadvantages

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

a) a flaw detection test

b) an attenuation test.

c) an EMI test

d) a Kaiser test

51.

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

a) with hot glue

b) with duct tape and wax

c) silicon-based vacuum grease and magnetic hold-downs.

d) permanent stick epoxy glue

52.

What is the Kaiser effect?

a) describes the phenomenon that a material under load emits acoustic waves only after a primary load level is exceeded.

b) appearance of significant acoustic emission at a load level below the previous maximum applied level

c) n aid to simulate an acoustic emission event

d) a signal filter technique

53.

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” a discontinuity in a material

c) determine material thicknesses

d) measure thermal gradients within a material

54.

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

a) acoustic emission response

b) acoustic emission count.

c) acoustic emission count rate

d) acoustic emission energy

55.

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

a) transformation

b) acoustic emission.

c) brittle fracture

d) isotrophy

56.

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

a) calculates the felicity ratio

b) check for leaks

c) monitor continuing damage

d) measure the Kaiser ratio

57.

What generates the acoustic waves?

a) the transducer

b) the crack.

c) Test duration

d) Background noise level

58.

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

59.

The total energy loss of a propagating wave is called:

a) scatter

b) dispersion

c) diffraction

d) attenuation.

60.

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

a) transformation

b) acoustic emission

c) brittle fracture

d) isotropy

61.

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 radiated from the defect itself

d) transducers are used to gather data

62.

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.

63.

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

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

64.

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

a) Impact test

b) Visual inspection

c) Sound test

d) Pressure test

65.

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

a) when access to the surface of the test object is limited

b) when surface temperatures start to reduce the coupling properties and bond strength of the adhesive

c) both a and b.

d) none of the above

66.

What can AE not be used for?

a) defect location

b) defect sizing.

c) he Kaiser effect

d) the Felicity effect

Question 1 of 66

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ASNT, ASNT NDT LEVEL – 1, NDT

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

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

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

The acoustic emission signal amplitude is related to:

Attenuation of a wave is best defined by which statement?

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

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

What is a guard sensor?

The most common frequency range of acoustic emission testing is:

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

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

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?

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

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

One microvolt is the same as:

What did Hsu-Nielsen invent?

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:

What is an important wave mode in AE testing?

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

What effect appears first when loading a material?

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

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

The term “counts” refers to the:

Background noise can be reduced by:

AE sensors may be mounted directly to painted surfaces if:

What kind of signal is generated by a crack?

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

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

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:

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

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

The felicity effect is useful in evaluating:

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

The kaiser effect is useful in distinguishing:

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

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

The Kaiser effect refers to:

In what acoustic frequency range works AE testing usually?

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

How many transducers are used to record the acoustic waves?

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

The founder of modern acoustic emission technology was:

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

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

The founder of modern acoustic emission technology was:

Threshold settings are determined by the:

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

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:

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

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

What is the Kaiser effect?

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

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

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

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

What generates the acoustic waves?

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

The total energy loss of a propagating wave is called:

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

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

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

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

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

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

What can AE not be used for?

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