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API API-571 Online Practice Questions and Exam Preparation

API-571 Exam Details

  • Exam Code
    :API-571
  • Exam Name
    :Corrosion and Materials Professional
  • Certification
    :API Certifications
  • Vendor
    :API
  • Total Questions
    :603 Q&As
  • Last Updated
    :May 31, 2026

API API-571 Online Questions & Answers

  • Question 481:

    In HF service, carbon steel operating above ________ should be closely monitored for loss in thickness and may need to be upgraded to Alloy 400.

    A. 150?F
    B. 175?F
    C. 160?F
    D. 200?F

  • Question 482:

    For furnaces, to prevent PASCC, keep the firebox heated above the dewpoint to keep ________ from forming.

    A. Water
    B. Acids
    C. Moisture
    D. Corrosion

  • Question 483:

    Corrosion protection in the boiler is accomplished by laying down and continuously maintaining a layer of _____.

    A. Manganese
    B. Magnetite
    C. Carbon monoxide
    D. Carbonate

  • Question 484:

    When carbon is absorbed into a material at elevated temperatures while in contact with a carbonaceous substance it is called carburization. Temperatures usually have to be above __________ for this to occur.

    A. 1000?F
    B. 1100?F
    C. 1200?F
    D. 1400?F

  • Question 485:

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

    A. Carbon monoxide
    B. H睴
    C. Temperature
    D. Carbon Dioxide

  • Question 486:

    With sulfidation, the presence of oxygen ________ corrosion

    A. Increases
    B. Decreases
    C. Has no effect on
    D. Stops

  • Question 487:

    With sour water corrosion, corrosion increases with __________ NH4HS concentration and __________ velocity.

    A. Increasing, Decreasing
    B. Increasing, Increasing
    C. Decreasing, Decreasing
    D. Decreasing, Increasing

  • Question 488:

    Cracking can occur at low caustic levels if a concentrating mechanism is present. In such cases, caustic concentrations of ________ ppm are sufficient to cause cracking.

    A. 50-100
    B. 100-150
    C. 150-200
    D. 200-250

  • Question 489:

    ________ is a loss in toughness due to a metallurgical change that can occur in alloys containing a ferrite phase, as a result of exposure in the temperature range 600?F to 1000?F.

    A. Caustic embrittlement
    B. Notch toughness
    C. 885?F embrittlement
    D. Ductile embrittlement

  • Question 490:

    Sensitization occurs in the _____ to _______ range.

    A. 800?F, 1400?F
    B. 750?F, 1500?F
    C. 600?F, 1120?F
    D. 1000?F, 1750?F

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