API ICP Programs API-571 Questions & Answers

• Question 451:

  With cooling water corrosion, _________ oxygen content tends to ________ carbon steel corrosion rates.

  A. Increasing, increasing

  B. Decreasing, decreasing

  C. Decreasing, increasing

  D. Increasing, decreasing

  Correct Answer: A

• Question 452:

  Corrosion in boiler feedwater and condensate return systems is usually the result of dissolved gases, oxygen and _______.

  A. Carbon monoxide

  B. H²O

  C. Temperature

  D. Carbon Dioxide

  Correct Answer: D

• Question 453:

  _________ is a selective corrosion mechanism in which one or more constituents of an alloy are preferentially attacked leaving a lower density often porous structure.

  A. Phenol corrosion

  B. Dealloying

  C. Carburization

  D. Preferentially weld attack

  Correct Answer: B

• Question 454:

  Ways to prevent thermal fatigue include reducing stress concentrators by making _______________ transitions at places where the wall thickness changes.

  Correct Answer: Smooth