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API API-571 Exam
Corrosion and Materials Professional (Page 12 )

Updated On: 7-Feb-2026
Page 12 of 92
PDF with 454 Questions

__________ are the most common type of equipment susceptible to carburization in the refining industry.

  1. Reactors
  2. Heat exchangers
  3. Heater tubes
  4. Fin Fans

Answer(s): C



Different organisms thrive on different nutrients including inorganic substances (Sulfur, H²S), and organic substances (Hydrocarbons, Organic acids). In addition, all organisms require a source of carbon, nitrogen and _______ for growth.

  1. Oxygen
  2. Water
  3. Manganese
  4. Phosphorous

Answer(s): D



In design and fabrication, it is advisable to avoid sharp changes in cross section, such as short radius fillets or undercut that can give rise to _________. Long-seam welds are particularly susceptible to reheat cracking due to mismatch caused by fit up problems.

  1. Stress concentrations
  2. Cracking
  3. Circumferential stress
  4. All of the above

Answer(s): A



The most important factors affecting graphitization are the chemistry, stress, temperature and _______.

  1. Velocity
  2. Time at exposure
  3. Pressure
  4. Ductility

Answer(s): B



Creep damage is found in high temperature equipment operating above the ________. Fired heater tubes and components, Catalytic reactors, FCC reactors and FCC fractionator and regenerator internals all operate in or near this.

  1. Transition range
  2. MADT
  3. Creep range
  4. None of the above

Answer(s): C






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