API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 241:

  Nickel based alloys usually contain ________ nickel.

  A. 30%
  B. 20%
  C. 10%
  D. 12%
  A. 30%

• Question 242:

  Corrosion rates of the anode will be less affected if there is a _________ anode to cathode ratio.

  A. Large
  B. Small
  C. Severe
  D. None of the above
  A. Large

• Question 243:

  With high temperature hydrogen attack, ________ using a combination of velocity ratio and backscatter have been the most successful in finding cracking.

  A. MT
  B. UT
  C. RT
  D. EC
  B. UT

• Question 244:

  Amine stress corrosion cracking is most likely to occur in what services?

  A. MDEA
  B. ADIP
  C. MEA
  D. DIPA
  C. MEA

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  From API RP 571 Section 5.1.2.7 (Amine Stress Corrosion Cracking) and API RP 945 (Avoiding Environmental Cracking in Amine Units):

  MEA (Monoethanolamine) systems are most aggressive due to:

  "Their high reactivity and degradation potential producing corrosive by-products that promote cracking."

  API RP 945:

  "SCC in carbon steel is most frequently reported in MEA units, especially where localized concentrations of

  heat-stable salts exist."

  Thus, Option C (MEA) is the correct answer due to its high SCC risk.

• Question 245:

  Temperature, ________ and stress are critical factors of stress rupture. This is usually found in furnaces with coking tendencies and fired heater tubes.

  A. Pressure
  B. Ductility
  C. Time
  D. Tensile strength
  C. Time

• Question 246:

  Sulfidation is also known as ____________.

  A. Sulfur corrosion
  B. Sulfate corrosion
  C. Sulfidic corrosion
  D. None of the above
  C. Sulfidic corrosion

• Question 247:

  Permanent deformation occurring at relatively low stress levels as a result of localized overheating is called ________.

  A. Stress cracking
  B. Brittle fracture
  C. Temper embrittlement
  D. Stress rupture
  D. Stress rupture

• Question 248:

  Which if the following materials are not susceptible to hydrogen stress cracking?

  A. Carbon steel
  B. Low alloy steel
  C. Stainless steel
  D. None of the above
  C. Stainless steel

• Question 249:

  Soil corrosion appears as external thinning with localized losses due to _________.

  A. Resistivity
  B. Pitting
  C. General corrosion
  D. Potential
  B. Pitting

• Question 250:

  __________ is a change in the microstructure of certain carbon steels and 0.5 Mo steels after long term operation in the 800?F to 1100?F range.

  A. Graphitization
  B. Softening
  C. Temper Embrittlement
  D. Creep
  A. Graphitization