API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 21:

  Cracking of a metal due to stress relaxation during PWHT or in service at elevated temperatures is called ______. It is most often found in heavy wall sections.

  A. Thermal cracking
  B. Reheat cracking
  C. Step-like cracking
  D. None of the above
  B. Reheat cracking

• Question 22:

  Cracks formed by carbonate stress corrosion are best detected:

  A. with a penetrant testing technique used after abrasive or high pressure water blasting of the surface.
  B. with an Acoustic Emission Testing technique.
  C. ultrasonic shear wave examination because cracks develop internally.
  D. with a wet fluorescent magnetic-particle testing technique.
  D. with a wet fluorescent magnetic-particle testing technique.

  ---

  According to API RP 571 Section 5.1.2.6 (Carbonate Stress Corrosion Cracking - CSCC): "The cracking is usually intergranular and is most commonly detected using wet fluorescent magnetic-particle testing (WFMT) after surface cleaning. PT may not be sensitive enough to detect fine cracks formed by this mechanism."

  Because CSCC cracks are typically surface-connected and very fine, WFMT offers the best visibility,

  especially after proper surface prep.

  Therefore, Option D is correct.

• Question 23:

  The major factors affecting high temperature sulfidation are the temperature, the presence of hydrogen, the H睸 concentration and the ________.

  A. Pressure
  B. Stress
  C. Alloy composition
  D. Velocity
  C. Alloy composition

• Question 24:

  SOHIC is driven by localized stresses so that __________ is somewhat effective in preventing SOHIC damage.

  A. PWHT
  B. Preheat
  C. Temperature
  D. None of the above
  A. PWHT

• Question 25:

  Which family of alloys is more sensitive to hydrogen embrittlement during fabrication?

  A. High Strength Low Alloys
  B. Chrome-Molybdenum Alloys
  C. Carbon -1/2 Molys
  D. Duplex Stainless Steels
  A. High Strength Low Alloys

  ---

  From API RP 571 Section 5.1.2.1 and RP 941:

  "High strength low alloy steels (HSLA) are more susceptible to hydrogen embrittlement, especially during cold work, forming, or welding. These materials, due to their higher tensile strengths, are more prone to cracking when exposed to hydrogen, particularly during fabrication or post-weld heat treatment operations." Therefore, Option A (High Strength Low Alloys) is the correct answer due to their known susceptibility during manufacturing and processing.

• Question 26:

  Dissimilar metal welds with a 300 Series stainless steel weld metal on a ferritic steel may also result in narrow region of _________ at the toe of the weld, near the fusion line on the ferritic side.

  A. Ductility
  B. Hardness
  C. Cracking
  D. None of the above
  B. Hardness

• Question 27:

  At high temperatures, metal components can slowly and continuously deform under load below the yield stress. This time dependent deformation of stressed components is known as __________.

  A. Deformation
  B. Fatigue
  C. Creep
  D. Thermal fatigue
  C. Creep

• Question 28:

  Hydriding of titanium is a metallurgical phenomenon in which hydrogen diffuses into the titanium and reacts to form an embrittling phase. This can result in a complete loss of _________ with no noticeable sign of corrosion or loss of thickness.

  A. Strength
  B. Ductility
  C. Carbides
  D. Hardness
  B. Ductility

• Question 29:

  Dissimilar weld metal cracking forms at the toe of the weld in the heat affected zone of the ________ material.

  A. Ferritic
  B. Austenitic
  C. Martensitic
  D. Both B and C
  A. Ferritic

• Question 30:

  PWHT is ___________ in preventing caustic SCC.

  A. Effective
  B. Not effective
  C. Not practical
  D. None of the above
  A. Effective