API API-571 Exam
Corrosion and Materials Professional (Page 4 )

Updated On: 7-Feb-2026

________ has been a major problem on coke drum shells.

  1. Thermal fatigue
  2. Stress cracking
  3. Erosion
  4. Temper embrittlement

Answer(s): A



Thermal fatigue cracks propagate ________ to the stress and are usually dagger shaped, transgranular and oxide-filled.

  1. Axial
  2. Diagonal
  3. Transverse
  4. Angular

Answer(s): C



Inspection for wet H2S damage generally focuses on _____ and ______.

  1. Weld seams
  2. Nozzles
  3. Trays
  4. Down comers
  5. A and B

Answer(s): E



________ is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles.

  1. Condensate corrosion
  2. Cavitation
  3. Dew-Point corrosion
  4. Atmospheric corrosion

Answer(s): B



With CUI, corrosion rates __________ with increasing metal temperatures up to the point where the water evaporates quickly.

  1. Decrease
  2. Increase
  3. Stay the same
  4. None of the above

Answer(s): B



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