API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 171:

  __________ is a form of damage found mostly in older vintage carbon steels and C-0.5 Mo low alloy steels under the combined effects of deformation and aging at an intermediate temperature.

  A. Spheroidization
  B. Thermal fatigue
  C. Strain aging D. None of the above
  C. Strain aging D. None of the above

• Question 172:

  Localized corrosion due to the concentration of caustic or alkaline salts that usually occurs under evaporative conditions is _________.

  A. Carbonate corrosion
  B. Caustic corrosion
  C. Alkaline corrosion
  D. None of the above
  B. Caustic corrosion

• Question 173:

  In order for PASCC to occur the material must be ______.

  A. PWHT
  B. Non-PWHT
  C. Sensitized
  D. Austenetic
  C. Sensitized

• Question 174:

  Metal dusting is preceded by ________ and is characterized by rapid metal wastage.

  A. Decarburization
  B. Carburization
  C. Graphitization
  D. None of the above
  B. Carburization

• Question 175:

  Carbon steel is susceptible to SCC when used in ___________ service.

  A. Hydrogen
  B. Ammonia
  C. High temperature
  D. High pressure
  B. Ammonia

• Question 176:

  Corrosion by HF (Hydrofluoric) acid can result in high rates of general or localized corrosion and may be accompanied by hydrogen cracking, blistering and ________.

  A. HIC
  B. Delayed cracking
  C. SOHIC
  D. Both A and C
  D. Both A and C

• Question 177:

  Short term overheating is a permanent deformation occurring at relatively _________ stress levels as a result of localized overheating. This usually results in bulging and failure by stress rupture.

  A. Low
  B. High
  C. Even
  D. None of the above
  A. Low

• Question 178:

  Temper embrittlement is defined as:

  A. An increase in ductility and notch toughness caused by postweld heat treatment (PWHT) or high-temperature service above 120癋 (49癈).
  B. A reduction in ductility and notch toughness caused by postweld heat treatment (PWHT) or low-temperature service below 120癋 (49癈).
  C. A reduction in fracture toughness caused by long-term exposure in the temperature range of 650癋 to 1070癋 (345癈 to 575癈).
  D. An increase in toughness caused by long-term exposure in the temperature range of 650癋 to 1100癋 (345癈 to 595癈).
  C. A reduction in fracture toughness caused by long-term exposure in the temperature range of 650癋 to 1070癋 (345癈 to 575癈).

  ---

  API RP 571 describes Temper Embrittlement as:

  "A metallurgical degradation mechanism that leads to a reduction in fracture toughness due to long-term

  exposure in the temperature range of 650癋 to 1070癋 (345癈 to 575癈)."

  "It affects Cr-Mo steels and is not easily detected except by impact testing."

  Therefore, option C most accurately defines the condition based on the recognized API description.

• Question 179:

  Which of the following materials is susceptible to carburization?

  A. Low alloy steels
  B. 300 Series SS
  C. 400 Series SS
  D. All of the above
  D. All of the above

• Question 180:

  Thermal fatigue becomes of concern if the temperature swings exceed:

  A. 50?F
  B. 100?F
  C. 200?F
  D. 400?F
  C. 200?F