Free ASNT NDT Bubble Leak Testing Level 3 Exam Practice Test

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When very large leaks go undetected during a vacuum box bubble leak test, it is usually because the operator is:

a. observing the leak detector solution for too short a time period

b. not observing the leak detector solution as the box initially seats.

c. not maintaining a pressure differential

d. using too much overlap between adjacent settings of the vacuum box

Because of inadequate clearance inside a shallow plastic vacuum box, the gage must be mounted externally. Which one of the following standard off-the-shelf gages would be the one to use on this vacuum box?

a. 101 mm (4 in.) diameter pressure dial gage with a range of 0 to 103 kPa (0 to 15 psi)

b. 51 mm (2 in.) diameter vacuum dial gage with a range of 0 to 8 kPa (0 to 60 mm Hg)

c. 101 mm (4 in.) diameter pressure dial gage with a range of 0 to 207 kPa (0 to 30 psi)

d. 51 mm (2 in.) vacuum dial gauge with a range of 0 to 102 kPa (0 to 30 in. Hg).

Under normal shop or field conditions at a differential pressure of one atmosphere (101 kPa or 14.7 psig), a bubble leak test enables the detection of leakage at least as small as:

a. 10^-5 std cm^3._S^-1

b. 10^-6 to 10-7 std cm^3._S^-1

c. 10^-2 to 10-3 std cm3^3._S^-1

d. 10^-5to 10-6 std cm^3._S^-1

When pressurizing for a bubble leak test, which of the following gases must never be used as the pressurizing medium?

a. Nitrogen

b. Carbon dioxide

c. Helium

d. Hydrogen.

Which of the factors listed below can affect the results of a bubble leak test?

a. Weather conditions

b. Technique of the operator

c. Duration of observation time of the detector solution after application

d. All of the above.

When writing a bubble leak testing procedure for the reinforcing pad plates with one weep hole, one simple way to ensure that the pad plate welds are really pressurized is to stipulate in the procedure that a:

a. the second hole be drilled and tapped in the reinforcing plate for the installation of the pressure gage

b. second pressure gage be installed in one of the inside welds

c. notch be cut at the end of the pipe nipple to be threaded into the reinforcing plate weep hole.

d. pressure hold test be performed after the bubble leak test

Which one of the following tests should always be performed and repairs made before conducting a bubble leak test?

a. Halogen leech box test

b. Liquid penetrant test

c. Hydrostatic test

d. Visual test.

From a safety standpoint, which one of the following would best full fill the design and material criteria for an aluminum vacuum box with a glass window? Design for:

a. 55 kPa (8 psig) using auto-safety glass

b. 103 kPa (15 psig) using auto-safety glass

c. 55 kPa (8 psig) using tempered plate glass

d. 103 kPa (15 psig) using tempered plate glass.

Which of the following is the primary reason why the one gasket cross section shown in question 7 is less desirable than the others?

a. It lacks an adequate sealing surface after the initial seating of the box

b. Air bubbles form between the two sealing tabs causing foam to form in the box

c. It requires the most amount of force to initially seat the box.

d. The bottom of the gasket would collapse, causing an uneven sealing surface

10.

The basic difference between a 35 kPa (5 psig) vacuum box bubble leak test and a bubble leak test of a vessel pressurized to 35 kPa (5 psig) is the:

a. type of leak detector solution that must be used

b. allowable difference in ambient weather conditions

c. technique used to obtain the pressure differential.

d. required length of observation time

11.

Which of the following would directly affect the performance of a leak detector solution for any technique of bubble leak testing?

a. Cost

b. Surface tension.

c. Flash point

d. Toxicity

12.

In which one of the following types of metal would a vacuum box bubble leak test be most likely to show bubbles on the weld surface as a result of false or spurious leakage from surface folds or internal porosity open to the surface?

a. 300 series stainless

b. Carbon steel

c. Aluminium.

d. 9% nickel

13.

In addition to bubble leak testing, what other non-destructive testing method, with or without a pressure differential, is most effective in the detection of leaks through a pressure boundary?

a. Magnetic particle testing

b. Liquid penetrant testing.

c. Holography testing

d. Ultrasonic testing

14.

Which one of the following would be the easiest and most economical technique for bubble leak testing the pipe-to-shell weld of a small diameter flanged nozzle that has no reinforcing pad plate and is flush with the inside of the shell?

a. Seal weld a pipe cap over the inner end of the pipe, pressurize the pipe, and bubble leak test the weld

b. Install a plumber’s plug in the inner end of the pipe, blank the nozzle flange, pressurize the pipe, and bubble leak test the weld

c. Install a plumber’s plug in the inner end of the pipe, blank the nozzle flange, evacuate the pipe and bubble leak test the weld

d. Blank the nozzle flange and vacuum box bubble leak test the weld from inside the shell.

15.

A wide selection of gasket cross sections is available for use on vacuum boxes. Of the typical gasket cross sections shown below, one is less desirable than the others for use on vacuum boxes. Select the gasket that is the least desirable.

16.

During a hydrostatic test of a vessel, water is detected running from the weep hole of a nozzle reinforcing pad plate. At the time of the initial test of this reinforcing pad plate, no leakage was detected when the outside reinforcing plate to pipe and shell welds and the inside pipe to shell weld were leak tested. Assuming there was pressure behind the pad plate during the initial test, the source of the leakage is most likely caused by:

a. slag inclusion through the shell behind the pad plate

b. shell plate lamination at the nozzle cut-out

c. burn through of the pipe wall covered by the reinforcing plate to pipe weld.

d. toe crack in the pad plate to shell weld

17.

A thin wall stainless butt welded tank built on a sloping concrete foundation is successfully tested and accepted by a customer. After being in service for a few weeks, every minute droplet of the product are detected coming from under the bottom. After removing the product, a thorough 55 kPa (8 psi) vacuum box retest of the tank bottom reveals no detectable leakage. Which of the following would you recommend as the best immediate course of action to locate the leakage?

a. Cover the bottom welds with an epoxy sealant

b. Pressurize the tank with refrigerant and

c. Coat the bottom with liquid penetrant; after performing a halogen sniffer test. long dwell time, remove the excess, apply developer, and then apply a pressure differential with a vacuum box and observe the developer for indications.

d. Fill the tank with water containing marker dye and watch for leakage containing the dye

18.

During the final pressure bubble leak test of an externally stiffened thin wall low pressure (14 kPa or 2 psig) vessel, bubbles are found streaming from one of the continuous stiffeners to shell fillet welds. A possible cause could be:

a. heating of the air trapped behind the stiffener fillet welds

b. application of the solution with entrained air bubbles

c. failure to rat hole the stiffeners where they cross shell butt welds which could contain leaks.

d. failure to initially examine the stiffener welds using liquid penetrant

19.

During the final pressure bubble leak test of a heavy wall vessel, test personnel repeatedly observe the formation of small areas of white foam on shell butt welds that were already radiographed, vacuum box bubble leak tested and then painted. What they are observing is most probably caused by:

a. foaming agent in the leak detector solution

b. entrained air escaping from the paint.

c. actual leaks missed during the vacuum box bubble leak test

d. trapped hydrogen escaping from the welded metal

20.

A customer’s specification requires that every 2 h during the vacuum box bubble leak testing, the bubble formation properties of the leak detector solution must be verified with a test leak. Which of the following is a method that would solve this requirement?

a. In a plate slightly bigger than the vacuum box, nearly shut. drill a very small hole and then peen the hole

b. Install a piece of tubing through the wall of nearly shut. the vacuum box with the inner end flattened

c. Flatten both ends nearly shut on a short piece of small diameter tubing for use under the vacuum box

d. Any of the above.

21.

The customer test specification outlines requirements for vacuum box bubble leak testing liner plate welds. Because there is no additional gain to justify the additional cost, an exception should be taken to which of the following vacuum box bubble testing requirements?

a. Minimum of 35 kPa (5 psi) pressure differential

b. No indication of leakage while under pressure for a minimum observation time of 60 s.

c. Verification of the bubble-forming properties of the solution every hour

d. None of the above are economical

22.

When preparing a procedure for a 345 kPa (50 psig) pressure bubble leak test to be performed in accordance with the minimum good practice required for any pneumatic pressure test, which of the following would best full fill the pressure gauge requirements for testing this system?

a. Two 1.7 MPa (250 psi) dials indicating gages. gage

b. One 689 kPa (100 psi) dial indicating and one 1 MPa (150 psi) recording gage.

c. One indicating dial gage with a range of 1 MPa (750 cm Hg)

d. None of the above

23.

Which of the following is a minimum good practice requirement for a bubble leak test procedure?

a. Leak detector solution must be observed for 30 s after application of the pressure

b. A pressure differential (partial vacuum) of at least 14 kPa (2 psi) should be maintained during the examination phase of a vacuum box bubble leak test.

c. A vacuum box for bubble leak testing must be capable of holding a pressure differential of at least 207 kPa (30 psi)

d. Lighting in the area being examined must be a minimum of 108 lx (10 fts)

24.

Which of the following is a minimum good practice requirement on the part of the operator while performing a bubble leak test?

a. Develop a vacuum of at least 124 kPa (36.5 in. Hg) on the specimen

b. Be able to maintain pressure on the specimen for at least 0.17 h

c. Be able to place the operator’s eyes within 61 cm (24 in.) of the test surface when observing the solution for leakage.

d. Have 20/20 vision without correction (glasses) in both eyes

25.

Which of the following should be included in bubble leak test procedures written for the best possible “good practice” operation?

a. Vacuum box must maintain a 35 kPa (5 psig) pressure differential for a minimum of at least 0.17 h

b. Must be able to place the operator’s eyes at an angle of not less than 10 degrees to the surface being examined

c. Temperature range of the test surface being examined.

d. None of the above

26.

Vacuum box bubble leak test procedures should include which of the items listed below?

a. Ability to detect leaks as small as 10-6 std cm3.S-1

b. Maximum length of weld examined for each setting of the vacuum box or the length of the vacuum box.

c. Minimum observation time of 0.17

d. All of the above

27.

To write a best practice bubble leak test specification within the realm of economical operation and compliance with most codes, which of the following parameters should be included?

a. Minimum pressure (vacuum) differential required

b. Method of solution application

c. Minimum observation time after solution application

d. All of the above.

28.

Which of the components listed are essential for a vacuum box for bubble leak testing?

a. Pressure regulator

b. Pop-off type relief valve

c. Transparent viewing window.

d. All of the above

29.

Which of the items listed below are requirements that should be included in a bubble leak test specification?

a. Detailed steps to follow in the performance of the bubble leak test technique specified

b. General statements regarding the theory behind the specified test techniques

c. Specific standards or codes and any special applicable test parameters.

d. All of the above

30.

Which of the below are some of the specific items for operator compliance to be detailed in a bubble leak test procedure?

a. A description of the scope and sequential operation techniques and required specific parameters

b. Acceptance/rejection criteria with reports/documentation required

c. Personnel qualifications required

d. All of the above.

31.

The best leak detector solutions routinely used for bubble leak testing preferably should have what interaction with the surface of the test specimens?

a. Ability to stick to the surface and not run off

b. Neutral (pH about 7) in chemical activity.

c. Should dry rapidly to speed up testing

d. Have good capillary action

32.

A field crew is performing vacuum box bubble leak tests. What action would he take in the following situation? An operator is testing the job and notices poor fit-up, and very rough welds with excess reinforcement. This is making leak testing very difficult and slowing the crew. What steps should be considered?

a. Request welds be ground relatively smooth to remove excessive reinforcement

b. Check with those who bid on the job – if specifications stated good fit up and ground flush welds would be provided, then some contract adjustment is indicated

c. Revamp the vacuum box or vacuum box seals to compensate for the poor fit-up and/or excess reinforcement

d. All of the above.

33.

The type of leak detector solution to use on a particular job would normally be selected:

a. in accordance with customer specification and/or applicable code requirements and/or on the basis of company procedures.

b. by the company purchasing agent or department

c. by Level I doing the testin’

d. on the basis of cost only

34.

An accurate quantitative measurement of the total leakage rate of a pressurized vessel can be determined by the bubble leak test method:

a. if the pressure gage is calibrated to an accuracy of 0.07 kPa (0.01 psig)

b. if the technician uses 10:1 magnification eyeglasses to estimate individual bubble sizes

c. if the gage is graduated to National Bureau of Standards* standards

d. none of the above.

35.

Under normal shop or field conditions at a differential pressure of one atmosphere (101 !cPa or 14.7 psig), a pressure bubble leak test enables the detection of leaks and leakage as large as:

a. weld cracks 76 mm (3 in.) long and 0.25 mm (0.01 in.) wide

b. pinhole 0.4 mm (0.02 in.) diameter

c. 10 std cm^3._S^-1

d. all of the above could be detected.

36.

When a pressure bubble leak test is to be performed on a large welded steel pressure vessel with many feet of weld to be tested, it would be better to complete the job as fast as possible by:

a. not taking time to rotate test personnel

b. cutting the overlap of assigned test areas by only one shell ring

c. not considering the human fatigue factor

d. organizing a large test crew into small squads or teams with assigned test areas.

37.

The purpose of notching the end of the pipe nipple of the pressurizing test assembly for bubble leak testing a reinforcing pad plate is to:

a. prevent over-pressurizing the area of the test vessel behind the reinforcing plate

b. ensure the safety of the workers and test crew

c. ·allow a flow of air to ensure pressurization of the pad plate in the event the nipple seals against the shell.

d. prevent seizure of the pipe nipple in the reinforcing pad plate

Question 1 of 37

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Take A Free ASNT NDT Bubble Leak Testing Level 3 Exam Practice Test – Quiz Course

When very large leaks go undetected during a vacuum box bubble leak test, it is usually because the operator is:

Because of inadequate clearance inside a shallow plastic vacuum box, the gage must be mounted externally. Which one of the following standard off-the-shelf gages would be the one to use on this vacuum box?

Under normal shop or field conditions at a differential pressure of one atmosphere (101 kPa or 14.7 psig), a bubble leak test enables the detection of leakage at least as small as:

When pressurizing for a bubble leak test, which of the following gases must never be used as the pressurizing medium?

Which of the factors listed below can affect the results of a bubble leak test?

When writing a bubble leak testing procedure for the reinforcing pad plates with one weep hole, one simple way to ensure that the pad plate welds are really pressurized is to stipulate in the procedure that a:

Which one of the following tests should always be performed and repairs made before conducting a bubble leak test?

From a safety standpoint, which one of the following would best full fill the design and material criteria for an aluminum vacuum box with a glass window? Design for:

Which of the following is the primary reason why the one gasket cross section shown in question 7 is less desirable than the others?

The basic difference between a 35 kPa (5 psig) vacuum box bubble leak test and a bubble leak test of a vessel pressurized to 35 kPa (5 psig) is the:

Which of the following would directly affect the performance of a leak detector solution for any technique of bubble leak testing?

In which one of the following types of metal would a vacuum box bubble leak test be most likely to show bubbles on the weld surface as a result of false or spurious leakage from surface folds or internal porosity open to the surface?

In addition to bubble leak testing, what other non-destructive testing method, with or without a pressure differential, is most effective in the detection of leaks through a pressure boundary?

Which one of the following would be the easiest and most economical technique for bubble leak testing the pipe-to-shell weld of a small diameter flanged nozzle that has no reinforcing pad plate and is flush with the inside of the shell?

A wide selection of gasket cross sections is available for use on vacuum boxes. Of the typical gasket cross sections shown below, one is less desirable than the others for use on vacuum boxes. Select the gasket that is the least desirable.

During the final pressure bubble leak test of an externally stiffened thin wall low pressure (14 kPa or 2 psig) vessel, bubbles are found streaming from one of the continuous stiffeners to shell fillet welds. A possible cause could be:

During the final pressure bubble leak test of a heavy wall vessel, test personnel repeatedly observe the formation of small areas of white foam on shell butt welds that were already radiographed, vacuum box bubble leak tested and then painted. What they are observing is most probably caused by:

A customer’s specification requires that every 2 h during the vacuum box bubble leak testing, the bubble formation properties of the leak detector solution must be verified with a test leak. Which of the following is a method that would solve this requirement?

The customer test specification outlines requirements for vacuum box bubble leak testing liner plate welds. Because there is no additional gain to justify the additional cost, an exception should be taken to which of the following vacuum box bubble testing requirements?

When preparing a procedure for a 345 kPa (50 psig) pressure bubble leak test to be performed in accordance with the minimum good practice required for any pneumatic pressure test, which of the following would best full fill the pressure gauge requirements for testing this system?

Which of the following is a minimum good practice requirement for a bubble leak test procedure?

Which of the following is a minimum good practice requirement on the part of the operator while performing a bubble leak test?

Which of the following should be included in bubble leak test procedures written for the best possible “good practice” operation?

Vacuum box bubble leak test procedures should include which of the items listed below?

To write a best practice bubble leak test specification within the realm of economical operation and compliance with most codes, which of the following parameters should be included?

Which of the components listed are essential for a vacuum box for bubble leak testing?

Which of the items listed below are requirements that should be included in a bubble leak test specification?

Which of the below are some of the specific items for operator compliance to be detailed in a bubble leak test procedure?

The best leak detector solutions routinely used for bubble leak testing preferably should have what interaction with the surface of the test specimens?

The type of leak detector solution to use on a particular job would normally be selected:

An accurate quantitative measurement of the total leakage rate of a pressurized vessel can be determined by the bubble leak test method:

Under normal shop or field conditions at a differential pressure of one atmosphere (101 !cPa or 14.7 psig), a pressure bubble leak test enables the detection of leaks and leakage as large as:

When a pressure bubble leak test is to be performed on a large welded steel pressure vessel with many feet of weld to be tested, it would be better to complete the job as fast as possible by:

The purpose of notching the end of the pipe nipple of the pressurizing test assembly for bubble leak testing a reinforcing pad plate is to:

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When very large leaks go undetected during a vacuum box bubble leak test, it is usually because the operator is:

Because of inadequate clearance inside a shallow plastic vacuum box, the gage must be mounted externally. Which one of the following standard off-the-shelf gages would be the one to use on this vacuum box?

Under normal shop or field conditions at a differential pressure of one atmosphere (101 kPa or 14.7 psig), a bubble leak test enables the detection of leakage at least as small as:

When pressurizing for a bubble leak test, which of the following gases must never be used as the pressurizing medium?

Which of the factors listed below can affect the results of a bubble leak test?

When writing a bubble leak testing procedure for the reinforcing pad plates with one weep hole, one simple way to ensure that the pad plate welds are really pressurized is to stipulate in the procedure that a:

Which one of the following tests should always be performed and repairs made before conducting a bubble leak test?

From a safety standpoint, which one of the following would best full fill the design and material criteria for an aluminum vacuum box with a glass window? Design for:

Which of the following is the primary reason why the one gasket cross section shown in question 7 is less desirable than the others?

The basic difference between a 35 kPa (5 psig) vacuum box bubble leak test and a bubble leak test of a vessel pressurized to 35 kPa (5 psig) is the:

Which of the following would directly affect the performance of a leak detector solution for any technique of bubble leak testing?

In which one of the following types of metal would a vacuum box bubble leak test be most likely to show bubbles on the weld surface as a result of false or spurious leakage from surface folds or internal porosity open to the surface?

In addition to bubble leak testing, what other non-destructive testing method, with or without a pressure differential, is most effective in the detection of leaks through a pressure boundary?

Which one of the following would be the easiest and most economical technique for bubble leak testing the pipe-to-shell weld of a small diameter flanged nozzle that has no reinforcing pad plate and is flush with the inside of the shell?

A wide selection of gasket cross sections is available for use on vacuum boxes. Of the typical gasket cross sections shown below, one is less desirable than the others for use on vacuum boxes. Select the gasket that is the least desirable.

During the final pressure bubble leak test of an externally stiffened thin wall low pressure (14 kPa or 2 psig) vessel, bubbles are found streaming from one of the continuous stiffeners to shell fillet welds. A possible cause could be:

During the final pressure bubble leak test of a heavy wall vessel, test personnel repeatedly observe the formation of small areas of white foam on shell butt welds that were already radiographed, vacuum box bubble leak tested and then painted. What they are observing is most probably caused by:

A customer’s specification requires that every 2 h during the vacuum box bubble leak testing, the bubble formation properties of the leak detector solution must be verified with a test leak. Which of the following is a method that would solve this requirement?

The customer test specification outlines requirements for vacuum box bubble leak testing liner plate welds. Because there is no additional gain to justify the additional cost, an exception should be taken to which of the following vacuum box bubble testing requirements?

When preparing a procedure for a 345 kPa (50 psig) pressure bubble leak test to be performed in accordance with the minimum good practice required for any pneumatic pressure test, which of the following would best full fill the pressure gauge requirements for testing this system?

Which of the following is a minimum good practice requirement for a bubble leak test procedure?

Which of the following is a minimum good practice requirement on the part of the operator while performing a bubble leak test?

Which of the following should be included in bubble leak test procedures written for the best possible “good practice” operation?

Vacuum box bubble leak test procedures should include which of the items listed below?

To write a best practice bubble leak test specification within the realm of economical operation and compliance with most codes, which of the following parameters should be included?

Which of the components listed are essential for a vacuum box for bubble leak testing?

Which of the items listed below are requirements that should be included in a bubble leak test specification?

Which of the below are some of the specific items for operator compliance to be detailed in a bubble leak test procedure?

The best leak detector solutions routinely used for bubble leak testing preferably should have what interaction with the surface of the test specimens?

The type of leak detector solution to use on a particular job would normally be selected:

An accurate quantitative measurement of the total leakage rate of a pressurized vessel can be determined by the bubble leak test method:

Under normal shop or field conditions at a differential pressure of one atmosphere (101 !cPa or 14.7 psig), a pressure bubble leak test enables the detection of leaks and leakage as large as:

When a pressure bubble leak test is to be performed on a large welded steel pressure vessel with many feet of weld to be tested, it would be better to complete the job as fast as possible by:

The purpose of notching the end of the pipe nipple of the pressurizing test assembly for bubble leak testing a reinforcing pad plate is to:

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