EMC PT Flashcards
It may be said that specialists in non-destructive testing must:
a) be aware of the capabilities of materials to sustain deformation without forming defects.
b) be knowledgeable about the materials they inspect and the defects which can form in
them.
c) have an exhaustive knowledge of metallurgy.
d) all the above answers are correct.
b) be knowledgeable about the materials they inspect and the defects which can form in
them.
Which of the following statements is correct?
a) The heat affected zone of a weld is basically a
homogeneous structure.
b) In some areas of the weld heat affected zone, grain size can be smaller than in the
unaffected base metal.
c) The temperature in the heat affected zone can sometimes exceed the temperature in the
fusion zone.
d) Transverse cracks do not occur in the heat affected zone
b) In some areas of the weld heat affected zone, grain size can be smaller than in the
unaffected base metal.
Metal forming such as rolling results in:
a) plastic flow of the metal.
b) elongation of existing defects perpendicular to the rolling direction.
c) directional properties which are always beneficial for secondary forming operations.
d) the flattening out of defects which makes them more easily detectable by most NDT
methods
a) plastic flow of the metal.
What can cause stress raisers?
a) Punch marks
b) Corrosion grooves
c) Corrosion pits
d) All the above answers
d) All the above answers
When a metal (or alloy) cools from a liquid to a solid state, the lack of molten metal to feed the
shrinkage will lead to:
a) pipes, voids and cavities.
b) sponge like appearance and hot tears.
c) none of the above.
d) both a) and b).
d) both a) and b).
Which of the following is not a cause of undercutting?
a) excessive amperage
b) excessive travel speed
c) excessive electrode diameter
d) excessive restraint during welding
d) excessive restraint during welding
An extremely thin discontinuity that is the result of pipes, or inclusions flattened and made
directional by working is called:
a) a stringer.
b) a lamination.
c) a seam.
d) a cold shut
b) a lamination.
In general, where can you find heat treatment cracks?
a) at the centre of a weld
b) in areas of sudden change in thickness
c) on a cast plate
d) all the above answers
b) in areas of sudden change in thickness
Which of the following statements concerning contaminating materials on the surface of a part to
be penetrant tested is not true?
a) The contaminant may be of a composition that attacks the penetrant and reduces the
fluorescence or color of the penetrant.
b) The contaminants may be of such a nature that they reduce or even prevent capillary
action by the penetrant.
c) The contaminant may retain the penetrant and thus increase the sensitivity of the
inspection.
d) The contaminant may completely fill the crack and thus prevent the entry of penetrant.
c) The contaminant may retain the penetrant and thus increase the sensitivity of the
inspection.
If inspection of parts is delayed:
a) indication from larger defects loose sharpness
b) small indications become prevalent
c) retesting is needed
d) wet developer can only be removed with vapour degreasing
a) indication from larger defects loose sharpness
Choosing the correct method of liquid penetrant inspection requires:
a) knowing the capabilities of the Liquid Penetrant Inspection methods available
b) history of the part
c) intended use of the part
d) all of the above
d) all of the above
Black light intensity from a standard mercury vapour lamp may vary due to:
a) the isotope of mercury used
b) line voltage supplied by
utilities
c) both a and b
d) none of the above
b) line voltage supplied by
utilities
Improper post cleaning of an Aluminum or Magnesium part tested with a penetrant containing an
emulsifier may result in:
a) pitting
b) cavitation
c) excessive bleed out
d) blotching
a) pitting
A somewhat linear intermittent penetrant indication would be formed by a:
a) crater crack
b) hot tear
c) forging lap
d) cold shut
c) forging lap
Which one of the following statements is true?
a) If the dryer temperature is too high, the heat may degrade the effectiveness of the
penetrant.
b) It is not necessary to remove a film of oil from a part prior to penetrant testing because the
penetrant is basically oil.
c) Parts should be heated prior to the application of a penetrant.
d) Development time should be at least twice the penetration time
a) If the dryer temperature is too high, the heat may degrade the effectiveness of the
penetrant.
All indications found by NDT methods are:
a) rejectable
b) direct
c) indirect
d) dimensionally correct
c) indirect
The term defect or flaw indicates:
a) a minimum or maximum size
b) suitability of the part for a given purpose
c) nature of the fault
d) none of the above
d) none of the above
Plastic film developers are used:
a) on plastics only
b) for maximum sensitivity
c) if permanent records are wanted
d) all of the above
c) if permanent records are wanted
