API API Certifications API-571 Questions & Answers

• Question 111:

  If the BHN is 400-500 it may indicate __________.

  A. Carburization

  B. Hydriding

  C. Temper embrittlement

  D. Caustic embrittlement

  Correct Answer: B

• Question 112:

  What treatment is used to prevent boiler feed water corrosion?

  A. Oxide scavengers are added to process

  B. Oxygen scavengers are added to process

  C. Sulfide scavengers are added to process

  D. Sulfur scavengers are added to process

  Correct Answer: B

• Question 113:

  Which of these materials exhibit an endurance limit below which fatigue cracking will not occur?

  A. Carbon steel

  B. 300 Series SS

  C. 400 Series SS

  D. None of the above

  Correct Answer: A

• Question 114:

  If wet electrodes or high moisture content flux weld electrodes are used to weld carbon steel, hydrogen can be charged into the steel resulting in _________.

  A. Reduced tensile strength

  B. Loss of ductility

  C. Delayed cracking

  D. All of the above

  Correct Answer: C

• Question 115:

  Thermal fatigue cracks usually initiate on the _________ of the component. They are generally wide and filled with oxides due to the elevated temperatures.

  A. Surface

  B. ID

  C. Welds

  D. None of the above

  Correct Answer: A

• Question 116:

  With sulfuric acid corrosion, carbon steel corrosion rates increases significantly if the flow velocity exceeds about ________m fps or at acid concentrations below _________.

  A. 6-9, 80%

  B. 5-7, 75%

  C. 2-3, 65%

  D. 4-6, 85%

  Correct Answer: C

• Question 117:

  ________ is a form of carbon that may promote carburization, particularly during decoke cycles where temperatures exceed the normal operating temperatures.

  A. Carbonic acid

  B. Coke

  C. Crude oil

  D. None of the above

  Correct Answer: B

• Question 118:

  Equipment that is temper embrittled may be susceptible to _______ during start-up and shutdown.

  A. Creep

  B. Thermal fatigue

  C. Brittle fracture

  D. Stress fatigue

  Correct Answer: C

• Question 119:

  Steel hardness, __________ and stress are critical factors in causing hydrogen stress cracking.

  A. Temperature

  B. Alloy composition

  C. Strength

  D. None of the above

  Correct Answer: C

• Question 120:

  Welds joining dissimilar materials (ferritic and austenetic) may suffer __________ related damage at high temperatures due to differential thermal expansion stresses.

  A. Stress

  B. Creep

  C. Fatigue

  D. Thermal stress

  Correct Answer: B