API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 531:

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

  A. Oxygen
  B. Water
  C. Manganese
  D. Phosphorous
  D. Phosphorous

• Question 532:

  Which of the following is considered resistant to cracking in hydrofluoric acid service?

  A. ASTM A-193 B5
  B. ASTM A-193 B7
  C. ASTM A-193 B7M
  D. ASTM A-325
  A. ASTM A-193 B5

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  API RP 751 (referenced in RP 571) lists materials appropriate for HF acid alkylation service. It specifies:

  "Chrome-moly steels such as ASTM A-193 B5 (5% Cr) bolts are preferred for their resistance to HF acid-induced cracking."

  "Standard low alloy steels (e.g., B7) are not considered adequately resistant."

  API RP 571 summary and API RP 751, Section 5.6.3 - Bolting Materials) Therefore, the correct and industry-approved answer is option A.

• Question 533:

  SSC is a form of hydrogen stress cracking resulting from the absorption of atomic hydrogen that is produced by the ______ corrosion process on the metal surface.

  A. HCl
  B. HF
  C. Sulfide
  D. Wet H睸
  C. Sulfide

• Question 534:

  Alloys with increased amounts of _______ show improved resistance to naphthenic acid corrosion.

  A. Chromium
  B. Molybdenum
  C. Nickel
  D. Carbon
  B. Molybdenum

• Question 535:

  Convert these temperatures ?156?C and 450?F

  A. 304?F, 151?C
  B. 284?F, 218?C
  C. 312?F, 232?C
  D. 296?F, 246?C
  C. 312?F, 232?C

• Question 536:

  Temper embrittlement _________ be prevented if the material contains critical levels of the embrittling impurity elements and is exposed in the embrittling range.

  A. Can
  B. Cannot
  C. Will
  D. None of the above
  B. Cannot

• Question 537:

  The best way to prevent 885?F embrittlement is to use low ________ alloys, or to avoid exposing the susceptible material to the embrittling range.

  A. Austenite
  B. Martensite
  C. Ferrite
  D. Chromium
  C. Ferrite

• Question 538:

  Which of these cast irons are not susceptible to graphitic corrosion?

  A. Gray cast iron
  B. Black Cast iron
  C. White cast iron
  D. None of the above
  C. White cast iron

• Question 539:

  To prevent carburization, select alloys with a strong surface oxide or sulfide film former such as ________.

  A. Silicon
  B. Molybdenum
  C. Aluminum
  D. Both A and C
  D. Both A and C

• Question 540:

  For hydrogen embrittlement, the amount of hydrogen necessary for a measurable effect on the mechanical properties varies with the alloy's strength, microstructure, and:

  A. Modulus of elasticity
  B. Coefficient of thermal conductivity
  C. Melting point
  D. Heat treatment
  D. Heat treatment

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  Per API RP 571, susceptibility to hydrogen embrittlement is strongly influenced by: Material strength level Microstructure Heat treatment condition Heat treatment determines: Dislocation density Trap sites for hydrogen Residual stress state The modulus of elasticity does not significantly affect hydrogen embrittlement susceptibility, making Option A incorrect. Referenced Documents (Study Basis): API RP 571 - Section on Hydrogen Embrittlement