API API Certifications API-571 Questions & Answers

• Question 101:

  Stress levels and __________ are the critical factors causing carbonate stress corrosion cracking.

  A. Temperature

  B. Velocity

  C. Water chemistry

  D. None of the above

  Correct Answer: C

• Question 102:

  Susceptibility to sulfidation is determined by the _________ of the material.

  A. Corrosion resistance

  B. Tensile strength

  C. Chemical composition

  D. Yield strength

  Correct Answer: C

• Question 103:

  If weld repairs are required, the effects of temper embrittlement can be temporarily reversed (de-embrittled) by heating at ______ for 2 hours per inch of thickness and rapidly cooling to room temperature.

  A. 1000º F

  B. 1150º F

  C. 1200º F

  D. 1250º F

  Correct Answer: B

• Question 104:

  Characteristic stress corrosion cracks have many branches and may be visually detectable by a __________ appearance on the surface.

  A. Tree shaped

  B. Craze-cracked

  C. Multiple crack

  D. None of the above

  Correct Answer: B

• Question 105:

  Contrary to a pure mechanical fatigue, there is no _________ load in corrosion-assistant fatigue. Corrosion promotes failure at a lower stress and number of cycles than the materials normal endurance.

  A. Tensile

  B. Stress

  C. Ductile

  D. Fatigue limit

  Correct Answer: D

• Question 106:

  Although the loss of toughness from temper embrittlement is not evident at operating temperatures, equipment that is temper embrittled may be susceptible to ________ during start-up and shutdown.

  A. Thermal fatigue

  B. Cyclic stress

  C. Notch toughness

  D. Brittle fracture

  Correct Answer: D

• Question 107:

  Carbonate stress corrosion cracking usually occurs at welds or cold worked areas that __________.

  A. Have been stressed relieved

  B. Have not been stressed relieved

  C. Have high residual stress

  D. Have high-applied stress

  Correct Answer: C

• Question 108:

  Sour water corrosion in _________ containing environments may be accompanied by carbonate SCC.

  A. H²O

  B. H²S

  C. CO²

  D. O²

  Correct Answer: C

• Question 109:

  Hydrochloric acid corrosion is a general and localized corrosion and is very aggressive to most common materials of construction. Damage in refineries is often associated with dew point corrosion in which vapors containing _______ and hydrogen chloride condense from the overhead stream of a distillation, fractionation, or stripping tower.

  A. O²

  B. O

  C. H²O

  D. CO²

  Correct Answer: C

• Question 110:

  ___________ cracking has been a major problem in coke drum shells.

  A. Stress

  B. Carburization

  C. Thermal fatigue

  D. Sulfide

  Correct Answer: C