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1.

Which of the following examinations or tests should always be performed before conducting a vacuum box bubble leak test?

 a. Halogen leak test

 b. Liquid penetrant test

 c. Hydrostatic test

 d. None of the above.

2.

A vacuum box should be in such a condition as to enable the operator to consistently attain a differential pressure (vacuum in the box) of:

 a. 12 to 12.5 m (40 to 41 ft) of water

 b. 1.3 to 2 kPa (10 to 15 mm Hg)

 c. 112 to 122 kPa (33 to 36 in. Hg)

 d. slightly more than that required by the procedure.

3.

What qualities are desired in a solution for leak detection of small leaks?

 a. Ablity to form thick foam or suds

 b. Ability to be applied relatively bubble-free over the test area and continuously form new bubbles at a leak location

 c. Highly volatile so there is no residue after the test.

 d. All of the above

4.

When a vacuum box bubble test is to be performed on a large area such as a flat bottom, it would be good leak testing practice to:

 a. test all the weld joints in one long sequence as fast as possible so as not to miss any areas

 b. test the large area by dividing it into small sections (one day or half day work for the test crew) rotating or changing testing personnel after testing of a section is complete in order to minimize the human fatigue factor.

 c. allow the test operator a 15-minute break every hour

 d. perform a hydrostatic test first in order to determine if a vacuum box bubble test is even required

5.

When performing a vacuum box bubble leak test, if the weld surface is so rough or the geometry of the weld is such that good rapid sealing of the box is not possible:

 a. grind out the weld and reweld

 b. raise the test specimen temperature

 c. grind the rough weld surface and/or adjust the shape of the vacuum box or the seal to better fit the geometry of the weld.

 d. all of the above

6.

When bubble leak testing, an accurate quantitative judgment of leakage rate can be determined:

 a. only if the bubble solution is heavy foam

 b. only if the bubble solution is applied with a spray

 c. if the operator is very alert and is good at mathematics

 d. none of the above.

7.

A bubble leak test of the weld joints of a vessel internally pressurized to 41 kPa (6 psig) or a leak test of the weld joints in a plate evacuated on one side with a vacuum box to 41 kPa (6 psig), are:

 a. both pressure type tests of equal pressure differential.

 b. different in that the first test will produce test results twice as sensitive as the second test

 c. different in that the vacuum box technique can be completed twice as fast as internally pressurizing the specimen

 d. none of the above

8.

What is the sensitivity limit of a production bubble leak test?

 a. 10^-5 std cm³_S^-1

 b. 10^-6 std cm³_S^-1

 c. 10^-7 std cm³_S^-1

 d. None of the above

9.

Leakage is detected during a bubble leak test of a pressurized vessel formerly used for natural gas storage. With all leaks marked at the conclusion of the test, the essential steps that must be performed to safely effect the repair of the vessel are to:

 a. fully purge the vessel with inert gas followed by air

 b. check for any residual explosive gases and adequate oxygen in the vessel

 c. repair and retest

 d. all of the above.

10.

Bubble leak testing can be performed without a vacuum box where the test specimen can be:

 a. pressurized.

 b. reduced in temperature to -40 °C (-40 °F)

 c. magnetized to a field strength of 10 G

 d. coated with fluorescent paint

11.

Which of the following is an advantage of all the techniques of the bubble leak test method?

 a. The results are quantitative in nature

 b. Limited skills and training are required for personnel.

 c. Very high sensitivity is attainable

 d. It is not satisfactory for detecting gross leakage

12.

Which of the following is an advantage of all the techniques of the bubble leak test method?

 a. The results are quantitative in nature

 b. Limited skills and training are required for personnel.

 c. Very high sensitivity is attainable

 d. It is not satisfactory for detecting gross leakage

13.

Which of the following best describes a condition when bubble leak testing may be done without the aid of a device such as a vacuum box?

 a. Where defects are small

 b. A pressure vessel that can be isolated under pressure.

 c. Welds that have been radiographed

 d. None of the above

14.

One of the advantages of using methyl alcohol as the fluid for immersion bubble leak testing is that it:

 a. cleans while acting as a test fluid.

 b. lasts a long time because of its low evaporation rate

 c. has a low flammability temperature

 d. has a high viscosity

15.

When performing a preliminary bubble leak test at a low pressure to detect very large leaks, the leak detector solution would be better applied to the test surface:

 a. only as a thin film or soapsuds

 b. only with a squirt can

 c. as a mixture of thick suds or foam.

 d. none of the above

16.

Under ideal shop or field conditions at a differential pressure of 103 kPa (15 psi), a pressure bubble leak test enables the detection of leakage as small as:

 a. 10^-7 std cm³_S^-1

 b. 10^-6 std cm³_S^-1

 c. 10^-4 std cm³_S^-1

 d. none of the above

17.

Which of the following directly determines the size of the bubble formation when testing using the bubble test method?

 a. The method of application of bubble solution

 b. The ambient temperature and barometric pressure

 c. The amount of leakage from a defect or leak.

 d. The size of the test specimen

18.

A major advantage of vacuum box bubble leak testing is that:

 a. it enables the operator to detect leaks as small as 10-6 std cm3S-1

 b. it does not require positive pressurization of the vessel or area tested.

 c. an accurate quantitative measure of the leakage rate can be readily obtained

 d. a pressure differential of several atmospheres is easily achieved

19.

In below-freezing (0 °C or 32 °F) conditions on a large in-place outdoor pipe and vessel system to be bubble leak tested, what action should a nondestructive testing technician take to ensure a valid leak test?

 a. Increase pressure differential to 107 kPa (3.16 in. Hg)

 b. Hold suitable vacuum/pressure for at least 0.17 h to make sure no leaks are missed

 c. Heat the air used for pressurizing or postpone the test until the ambient temperature is warm enough and sufficient time is passed to melt any ice that may have formed in leaks.

 d. All of the above

20.

Ideal weather conditions for a bubble leak test of a large, in place vessel (outside) would be:

 a. moderately warm

 b. cloudy

 c. calm (little or no wind

 d. all the above.

21.

Leak testing practice per ASME Boiler and Pressure Vessel Code, Section V for bubble leak tests of pressurized systems requires that prior to applying the bubble forming solution, the pressure should be held for a minimum soak time of:

 a. 0.5 h.

 b. 1 h

 c. until specimen temperature reaches ten degrees above ambient

 d. none of the above.

22.

As a standard technique for vacuum box bubble leak testing, good leak testing practices require that the temperature of the test surface remain in the range of:

 a. 4 to 38 °C (40 to 100 °F).

 b. the test temperature should be reduced to below the dew point

 c. at whatever temperature the test surface will be when placed in service

 d. none of the above

23.

When performing a vacuum box bubble leak test to detect very small size leaks, the leak detector solution should be applied:

 a. after the test surface has been cleaned

 b. in a continuous film

 c. free of contained bubbles

 d. all of the above.

24.

When performing a bubble leak test of a gas pressurized system, the purpose of the soak time between completion of pressurization and application of the leak detection solution is to allow time for:

 a. dispersion of bubbles entrained in the detector solution

 b. dispersion of the pressurized gas through very small and long and tortuous path leaks.

 c. the temperature of the pressurized gas to reach non-destructive testing temperature

 d. cooling of the pressurized gas which reduces dewpoint and moisture levels inside the system

25.

Weld joints to be vacuum box bubble 1 should first be:

 a. visually tested for the technician’s suspect areas, and repair all this before performing the bubble leak test

 b. ground absolutely smooth

 c. deluged and cleaned with a wire bi and/or rag and solvent to remove matter or grease.

 d. all of the above

26.

Which of the following are factors which affect the results of a bubble leak test?

 a. Technique and alertness of the opera

 b. Pressure differential used and duration observation time of the test area after application of the leak detector solution

 c. Lighting of the area being examined

 d. All of the above

27.

Which of the following are factors which affect the results of a bubble leak test?

 a. Technique and alertness of the opera

 b. Pressure differential used and duration observation time of the test area after application of the leak detector solution

 c. Lighting of the area being examined

 d. All of the above

28.

If freezing temperatures exist outside (below 0 °C or 32 °F) and the test vessel is indoors, what action should the non-destructive testing technician take to ensure that a valid bubble leak test is performed?

 a. No special action is necessary if the building is heated (day and night).

 b. Ambient temperature inside the building should be raised to at least 46.2 °C (115 °F)

 c. If it is raining, completely cover the test vessel with a tarp

 d. None of the above

29.

During hot sunny weather, test personnel performing a bubble leak test outdoors should:

 a. do all testing at night so all spontaneous radiation will not endanger workers or test

 b. apply several coatings of test solution so that the personnel. a heavy coating of solution will evaporate slower

 c. limit coverage of the test surface with solution film to an area of such size that it can be tested before the detector solution dries or evaporates from the surface of the metal.

 d. none of the above

30.

A leak detector solution for bubble leak testing should ideally have:

 a. low surface tension for detecting very large leaks

 b. low surface tension for detecting very small leaks and higher surface tension for detecting very large leaks.

 c. high surface tension for detecting very small leaks and lower surface tension for detecting very large leaks

 d. high surface tension for detecting very small leaks

31.

One of the basic differences between a 35 kPa (5 psig) pressure bubble leak test of a complete pressure vessel and a 35 kPa (5 psig) vacuum box bubble leak test of a weld in a plate is:

 a. the 35 kPa (5 psig) vessel bubble leak can be performed outdoors in -40 °C (-40 °F) weather

 b. the pressure bubble leak test is always at least twice as sensitive as the vacuum box bubble leak test

 c. the pressure bubble leak test sensitivity is independent of pressure differential and is entirely dependent on the leak detector solution temperature

 d. none of the above.

32.

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

 a. not maintaining the box temperature at 100 °C (212 °F)

 b. forgetting to check the calibration of the vacuum or pressure dial gauge

 c. not giving the solution time to get set before seating the vacuum box

 d. none of the above.

33.

A vacuum box equipped with a rectangular pliable rubber gasket is difficult to initially seat across lap welds. When no other gasket or box is the box the best course of action is to trim the gasket to reduce the initial contact area. Circle available, to improve the initial seating ability of a” or “b” by the sketch that best indicates how this gasket should be trimmed.

 a

 b

 c

 d

34.

The type of leaks that are most likely to go undetected during a bubble leak test are:

 a. very small leaks and very large leaks.

 b. leaks occurring at welded joints

 c. corner configuration joints

 d. all of the above

35.

The pipe-to-shell weld of a 51 mm (2 in.) diameter flanged nozzle with no reinforcing pad plate is flush with the inside of the vessel shell. The simplest way to bubble leak test this weld prior to completion of the vessel would be to:

 a. blank the nozzle flange, install a plumber’s plug in the inner end and perform a pressure bubble leak test of the weld

 b. test the nozzle weld along with the shell circumferential welds

 c. blank the nozzle flange and vacuum box bubble leak test the weld from inside the shell.

 d. it is not possible to bubble leak test this geometric configuration

36.

Good practice dictates that when pressurizing a component for a bubble leak test:

 a. the test gage should be cleaned with alcohol

 b. test pressure should be 150% of the design pressure

 c. two pressure gages should be used.

 d. only one recording gage should be used

37.

Safe test practices dictate that all dial gages used for vacuum box bubble leak testing should be calibrated:

 a. at least every 2 weeks

 b. when taken from storage and prior to use.

 c. once a month whether in use or in storage

 d. none of the above

38.

Gages used for vacuum box bubble leak testing should preferably have dials graduated over a range of:

 a. more than five times the intended pressure

 b. atmospheric pressure.

 c. less than ten times but more than five times the intended maximum pressure

 d. four times the maximum intended pressure

39.

Good operating practice dictates that when performing bubble leak tests on a pipe and vessel system. which of the following should be used?

 a. A gage graduated in pounds per square foot

 b. Two gages, one dial indicating and one recording.

 c. Two gages in English system and two gages in metric system

 d. A gage with face diameter of at least 27 cm (10.5 in.) graduated in psia

40.

When a vacuum gage is marked with a range of zero to thirty with the notation vacuum on the face, the units of measurement are:

 a. inches of mercury.

 b. pounds per square inch

 c. centimetres of vacuum

 d. feet of water

41.

For immersion bubble leak testing, which of the following is correct?

 a. Pressure should be applied to the test specimen after it is immersed

 b. Increasing the pressure in the test specimen does not increase the sensitivity of the test

 c. The fluid in which the test specimen is immersed should have low surface tension.

 d. Water produces the most sensitive test results for this bubble test technique

42.

Which of the following is the least sensitive solution to use for immersion bubble leak testing?

 a. Heated silicone oil

 b. Methyl alcohol

 c. Water with a wetting agent

 d. Tap water.

43.

From the standpoint of simplicity, economy, and rapidity of testing, the best method for creating the pressure differential for bubble leak testing of very small sealed components which can be pressurized is to:

 a. use quick-acting couplings on the incoming air supply

 b. immerse them in a preheated low surface tension fluid bath.

 c. use quick acting couplings on a Gatling gun-type arrangement

 d. install them in a chamber and evacuate the chamber

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