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Corrosion and Materials Professional

Exam Details

  • Exam Code
    :API-571
  • Exam Name
    :Corrosion and Materials Professional
  • Certification
    :API Certifications
  • Vendor
    :API
  • Total Questions
    :454 Q&As
  • Last Updated
    :Jun 28, 2025

API API Certifications API-571 Questions & Answers

  • Question 51:

    Sulfur and chlorine species in fuel will form sulfur dioxide, sulfur trioxide and hydrogen chloride within the combustion products. At low enough temperatures, these gases and the water vapor in the flue gas will condense to form _________ acid.

    A. Hydrochloric

    B. Hydrofluoric

    C. Sulfuric

    D. Both A and C

  • Question 52:

    Cracking susceptibility increases with __________ pH and carbonate concentration.

    A. Increasing

    B. Decreasing

    C. Low

    D. High

  • Question 53:

    Steel cleanliness and _______ have a significant influence on toughness and resistance to brittle fracture.

    A. Composition

    B. Alloy

    C. Grain size

    D. None of the above

  • Question 54:

    Major factors affecting sulfidation are alloy composition, temperature and ________.

    A. Time

    B. Stress

    C. Concentration of hydrogen

    D. Concentration of sulfur

  • Question 55:

    Susceptibility to temper embrittlement is largely determined by the presence of the alloying elements manganese and _______.

    A. Chromium

    B. Moly

    C. Silicon

    D. None of the above

  • Question 56:

    Which of the following is not a major factor associated with corrosion by sulfidation?

    A. Alloy composition

    B. Operating pressure

    C. Operating temperature

    D. Sulfur content

  • Question 57:

    Cracks connecting hydrogen blisters are referred to as ________.

    A. SOHIC

    B. HIC

    C. SCC

    D. None of the above

  • Question 58:

    Which of the following is not a primary initiating point for thermal fatigue?

    A. Notches

    B. Rounded pits

    C. Nozzle-to-shell welds

    D. Weld toes

  • Question 59:

    Typical HF Alkylation units operate with 1% to 3% water in the acid, equivalent to an HF-in- water concentration of 97% to 99% and the temperatures are generally below _________.

    A. 300º F

    B. 250º F

    C. 200º F

    D. 150º F

  • Question 60:

    Refractory anchors must be resistant to __________ in high temperature services.

    A. Thermal fatigue

    B. Thermal cracking

    C. Stress cracking

    D. Oxidation

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