API API Certifications API-571 Questions & Answers

• Question 141:

  Stress relief and stabilization heat treatment of 300 Series SS for maximizing chloride SCC and PASCC resistance can cause ____________ problems, especially in thicker sections.

  A. Thermal fatigue

  B. Reheat cracking

  C. Hydrogen

  D. HIC

  Correct Answer: B

• Question 142:

  Corrosion protection in the boiler is accomplished by laying down and continuously maintaining a layer of _____.

  A. Manganese

  B. Magnetite

  C. Carbon monoxide

  D. Carbonate

  Correct Answer: B

• Question 143:

  The graphitization rate ____________ with increasing temperature

  A. Increases

  B. Decreases

  C. Stops

  D. Proceeds

  Correct Answer: A

• Question 144:

  High temperature H² / H²S corrosion damage is minimized by using alloys with high _________ content.

  A. Carbon

  B. Molybdenum

  C. Chromium

  D. Stainless

  Correct Answer: C

• Question 145:

  The more noble material, called the ________, is protected by sacrificial corrosion of the more active material, called the ________. The more active metal corrodes at a higher rate than it would if it were not connected to the more noble metal.

  A. Anode, Cathode

  B. Cathode, Anode

  C. Alpha, Omega

  D. None of the above

  Correct Answer: B

• Question 146:

  Carbonate stress corrosion cracking is the term applied to surface breaking or cracks that occur adjacent to carbon steel welds under the combined action of ____________ and ___________ in carbonate containing systems.

  A. Temperature, stress

  B. Tensile stress, corrosion

  C. Corrosion, velocity

  D. Tensile stress, velocity

  Correct Answer: B

• Question 147:

  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

  Correct Answer: A

• Question 148:

  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

  Correct Answer: B

• Question 149:

  With decarburization, the decarburized layer will be free of carbide phases. Carbon steel will be ______.

  A. Annealed

  B. Quenched

  C. Pure iron

  D. None of the above

  Correct Answer: C

• Question 150:

  A 6", A106 Gr B, flanged line carrying caustic wash water at 200?F has signs of atmospheric corrosion. Which of the following may have help accelerate the corrosion?

  A. Sulfides

  B. Fly ash

  C. Caustic D. None of the above

  Correct Answer: B