API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 571:

  Amine corrosion occurs principally on what class of materials?

  A. Duplex Stainless Steels
  B. Low Alloy Steels
  C. Carbon Steels
  D. Austenitic Stainless Steels
  C. Carbon Steels

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  API RP 945, dedicated to environmental cracking in amine units, states:

  "Carbon steel is widely used in amine systems but is particularly susceptible to localized corrosion, under-deposit corrosion, and stress corrosion cracking, especially in high-pressure or rich amine environments." "Proper control of amine quality, oxygen ingress, and temperature is critical to avoid accelerated corrosion in carbon steel equipment." Thus, carbon steels are the most commonly affected materials, making option C correct.

• Question 572:

  _________ is accelerated high temperature wastage of materials that occurs when contaminants in the fuel form deposits and melt on the metal surfaces.

  A. Spheroidization
  B. Dealloying
  C. Fuel ash corrosion
  D. None of the above
  C. Fuel ash corrosion

• Question 573:

  Naphthenic acid is _____ by catalytic reactions in downstream hydro processing and FCC units.

  A. Enhanced
  B. Destroyed
  C. Concentrated
  D. Diluted
  B. Destroyed

• Question 574:

  Mechanical fatigue can cause cracks that initiate from the surface and often form a:

  A. Clam shell appearance.
  B. Snail shell appearance.
  C. Turtle shell appearance.
  D. Shell Oil shell appearance.
  E. Taco shell appearance.
  A. Clam shell appearance.

• Question 575:

  All ________ based materials and low alloy materials, 300 Series SS and 400 Series SS are susceptible to Sulfidation.

  A. Carbon
  B. Steel
  C. Chromium
  D. Iron
  D. Iron

• Question 576:

  Sulfide stress cracking (SSC) is defined as cracking of metal under the combined action of tensile stress and corrosion in the presence of _________ and _________.

  A. Sulfur, Oxide
  B. Hydrogen, water
  C. H睸, Oxygen
  D. Water, H睸
  D. Water, H睸

• Question 577:

  Which of the following is not a major factor associated with boiler water condensate corrosion?

  A. Operating pressure
  B. Oxygen content
  C. Carbon dioxide content
  D. Process ph
  E. Temperature
  A. Operating pressure

• Question 578:

  Sulfuric acid promotes general and localized corrosion of carbon steel. Carbon steel heat affected zones may experience severe corrosion. Acid concentration, temperature, alloy content and ____________ are critical factors affecting sulfuric acid corrosion.

  A. Pressure
  B. Stress
  C. Velocity
  D. Ductility
  C. Velocity

• Question 579:

  Ammonium chloride corrosion is the general or localized corrosion, often pitting, normally occurring under ammonium chloride or amine salt deposits. All commonly used materials are susceptible to ammonium chloride corrosion. A small amount of _________ can lead to very aggressive corrosion.

  A. Ammonium chloride
  B. Amine
  C. Water
  D. Salt
  C. Water

• Question 580:

  __________ caustic concentrations and ________ temperatures increase the likelihood and severity of cracking with caustic embrittlement.

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