Questions for Magnetic Particle Testing – Specific

Questions for Magnetic Particle Testing – Specific

1) Which form of magnetization is easiest to control in most parts?

(a)       Longitudinal magnetization

(b)       Permanent magnetism

(c)       Circular magnetization

(d)       Parallel magnetization

2) A continuous linear indication along the edge of a new fillet weld would most likely be a:

(a)       Crater crack

(b)       Fatigue crack

(c)       Stress corrosion crack

(d)       Heat affected zone hydrogen crack

3) Magnetic lines of flux which are parallel to a discontinuity produce:

(a)       Strong indications

(b)       Weak indications

(c)       No indications

(d)       Fuzzy indications

4) The primary reason for using water rather than oil as a suspension medium for wet method baths is that

(a)       Water is more chemically inert than oil

(b)       Bath flammability hazards are eliminated

(c)       Water has the capability to dissolve the needed rust inhibitors

(d)       Water baths may be used at a lower temperature than oil baths

5) Wet magnetic particle strength is checked by which of the following?

(a)       Specific gravity

(b)       Optical density

(c)       Settling test

(d)       None of the above

6) What are the three causes of non-relevant indications?

(a)       Lack of fusion, change of section thickness, grinding cracks

(b)       Change of section thickness, very high amperage, drilled hole near surface

(c)       Very high amperage, drilled hole near surface, blow holes

(d)       Drilled hole near surface, very high amperage, lack of fusion

7) The magnetic field is the strongest when:

(a)       The magnetising current is flowing

(b)       The magnetising voltage is applied

(c)       The leakage field is flowing

(d)       The magnetising current is off

8) A Longitudinal magnetic field:

(a)       Will have at least 2 magnetic Poles

(b)       Will only have 1 magnetic Pole

(c)       Has no magnetic Poles

(d)      None of the above

9) According to ASME SEC V, how much lifing capacity need for AC and DC Yoke?

(a)       4 Kg and 16 Kg

(b)       4.5 Kg and 18 Kg

(c)       10 lb and 18 lb

(d)       10 Kg and 40 Kg

10) Subjecting the part to a magnetic field that is constantly reversing in polarity and gradually diminishing in strength accomplishes which of the following:

(a)       Magnetises the part

(b)       Removes residual field from the part

(c)       Soaks in the flux density

(d)       Helps find deep lying defects

11) Demagnetization must be needed according to ASME Sec V when

(a)      When residual magnetism in the part could interfere with subsequent   processing or usage, the part shall be demagnetized any time after completion of the examination.

(b)      The residual magnetism measurement shall be made on each bevel end of the pipe. The residual magnetism at the test surface shall not exceed 30 gauss average four reading & No single reading shall exceed 35 gauss. It is measured by using calibrated Hall Effect gauss meter or by other competitive equipments.

(c)      If residual magnetism found more specified above, demagnetization shall be carried out. After demagnetization the residual magnetization shall be measured again.

(d)      All of the above

12) Relevant indications are produced by:

(a)       Greasy surfaces

(b)       Excessive background

(c)       Leakage fields

(d)       Rotating Eddy currents

13) According to the document ASME Sec V the method of examination shall be:

(a)       Residual method

(b)       Quick brake method

(c)       Continuous method

(d)       Yoke method

14) A defect open to the surface produces an indication which is

(a)       Sharp and distinct

(b)       Wide and indefinite

(c)       Criss-cross

(d)       High and fuzzy

15) The bath concentration in 100 mL should be within ………… to …………… for visual examination according to the ASME Sec V:

(a)       0.1 mL, 0.4 mL

(b)       1.2 mL, 2.4 mL

(c)       0.1 mL, 1.2 ml

(d)       0.4 mL, 2.4 mL

16) According to the document QCD.PRO.11the method of examination of fluorescent shall be:

(a)       a minimum of 1000 lux Black light intensity

(b)       a minimum 1000 fc.

(c)       a minimum 1000 lux.

(d)       a minimum of 1000μW⁄cm². Black light intensity

17) Which of the following is false according to the ASME Sec V?

(a)       Relevant indications are produced by leakage fields, which are the result of discontinuities. Relevant indications required evaluation with regard to the acceptance standards.

(b)       False indications are not the result of magnetic forces, those may be particles held mechanically or by gravity in shallow depressions or particles held by rust, scale on the surface.

(c)        Any indication found non relevant or false during MPI, the same shall be recorded.

(d)       all of the above

18) Demagnetization:

(a)       may be easy or difficult depending on the type of material

(b)      is easy for material having a high coercive force

(c)      is always most difficult in materials retaining a high residual field

(d)      all of the above

19) According to doc. ASME Sec V the operator shall be in darkness area at least ……………. prior to examination:

(a)       2 min

(b)       3 min

(c)       4 min

(d)       5 min

20) Which of the following is false according to the ASME Sec V:

(a)      The beginning of each normal inspection shift.

(b)      Every four hours of the running system.

(c)      Before any planned shutdown of the magnetic equipment’s during production.

(d)      None of the above

21) Generally DC use for:

(a)      subsurface discontinuity

(b)      surface discontinuity

(c)      deep seed discontinuity

(d)      for weld only discontinuity

22) From Yoke, the demagnetization can occur by the process:

(a)      continue current and take- away to job or Yoke

(b)      continue current and take- near to job or Yoke

(c)      continue current for some time

(d)      none of the above

23) The dark adaptation shall be minimum time:

(a) 1 minute

(b) 4 minute

(c) 5 minute

(d) 6 minute

24) Yoke produce highest magnetic field strength:

(a)       Between the poles

(b)       Opposite of poles

(c)       Increase with distance from poles

(d)       None of the above

25) Indication formation due to:

(a) flux leakage

(b) magnetic particle leakage

(c) circular magnetic field

(d) longitudinal magnetic field

(e) all the above

26) The crack that open to the surface

(a) produce sharp indication

(b) produce broad indication

(c) produce fuggy indication

(d) produce rounded indication

27) Part structure produce

(a) relevant indication

(b) non-relevant indication

(c) false indication

(d) none of the above


28) For direction and strength of the magnetic field measurement:

(a) using gauss meter

(b) magnetic particle

(c) analogue meter

(d) pie gauge


29) AC shall be use for surface discontinuity because

(a) easy to detect

(b) low current density at surface

(c) skin effect

(d) none of the above


30) Gauss meter use to measure:

(a) concentration

(b) field direction

(c) field strength

(d) flux density