Section 5 : Non destructive testing.
1 Which of the following defects is unlikely to be found by visual inspection.
a) Linear misalignment
b) Undercut
c) Overlap
d) Linear slag inclusion
2 The usual method of assessing the sensitivity of radiograph is by means of a:
a) Dosimeter
b) Fluoroscope
c) IQI ( Penetrameter)
d) Clinometer
3 Which of the following methods of NDT would be most likely to detect lack of side
wall fusion in ferritic steel welds?
a) Penetrants
b) Magnetic particles
c) Radiography
d) Ultrasonic flaw detector
4 You suspected that ferritic steel plates, which have been edge, prepared contain crack
in the prepared edges. Which NDT method would you use to check this?
a) Radiography
b) Magnetic particle
c) Penetrants
d) Ultrasonic flaw detector
6 Lamellar tearing has been occurred in steel fabrication. Before welding it could have
been found by:
a) X-ray examination
b) Dye penetrant
c) Ultrasonic inspection
d) It would not have been found by any inspection method
7 In X-ray the quality of the radiograph negative is assessed by the?
a) Density of the Film
b) IQI indicator
c) KVA available
d) Stand-off distance
8 A magnifying glass may be used during visual inspection but BS 5289 states that its
magnification should be:
a) Up to 5x
b) 2x – 5x
c) 5x – 10x
d) None of the above
9 Ultrasonic testing is of advantage in detecting which of the following weld
imperfections over other NDT methods:
a) Lack of side wall fusion
b) Surface undercut
c) Incompletely filled groove
d) Overlap
10 Generally the most suitable method of detecting lack of sidewall fusion would be:
a) Ultrasonic
b) MPI
c) Radiography
d) Penetrants
11 The use of cobalt as an isotope would generally be used on:
a) Thin materials
b) Tee joints
c) Plate thickness greater than 25mm
d) None of the above
12 One of the following alloys is non-magnetic. Which?
a) Martensitc stainless steel
b) 12 % Chromium.
c) Austenitic Stainless Steel.
d) 9 % Nickle Steel.
13 On which of the following would you not use MPI inspection ?
a) A low carbon steel butt welded t joint
b) An Austenitic Stainless steel fillet welded T joint
c) A medium carbon steel fillet welded lap joint
d) All of the above
14 Internal lack of fusion defects can be normally found by using:
a) Penetrant testing
b) Impact tests
c) Side bend test
d) Hardness test
15 An IQI would be used in radiography to assess:
a) Radiograph quality
b) Type of steel
c) Density of a graph
d) Type of welding process used
16 Which of the following contamination could affect the sensitivity of penetrant :
a) Acid.
b) Water.
c) Salts.
d) All of the above.
17 The prime purpose of the black light for fluorescent penetrant inspection is:
a) To magnify indications.
b) To make the indications visible.
c) To develop indications.
d) To speed up inspection.
18 When considering the advantages of site RT over UT which of the following
applies :
a) A permanent record produced, good for detecting defects which do not
have significant depth in relation to axis of the X-ray beam and defect
identification.
b) A permanent record produced, good for detecting all surface and
sub-surface defects and assessing the through thickness depths of defects.
c) A permanent record produced, defect identification not so reliant
on operator skill.
d) No controlled areas required on site, a permanent record produced and
good for assessing the extent of pipe wall thickness reductions due to
internal corrosion.
19 Which of the following NDT method is not suitable to detect sub surface defect :
a) UT.
b) PT.
c) RT.
d) MPI.
20 Which sub atomic particle has a +ve charge :
a) A Proton.
b) A Photon.
c) An Electron.
d) A Neutron.
21 Which of the following would show as light indications on a radiograph :
a) Slag inclusions and copper inclusions.
b) Tungsten inclusions and excessive penetration.
c) Cap undercut and root piping.
d) Excessive cap height and incomplete penetration.
22 WHICH OF THE FOLLOWING IS NOT GOOD PRACTICE WHEN PENETRANT TESTING :
a) Applying emulsifier by dipping in emulsifier.
b) Applying developer by spraying the part with developer.
c) Removal of water – washable penetrant with a water spary.
d) Applying emulsifier with a brush.
23 Which of the following is most apt to render the post-emulsification test
ineffective :
a) Too long of a penetrant time.
b) Too long of a developing time.
c) Too long of an emulsifying time.
d) None of the above.
