API API Certifications API-571 Questions & Answers

• Question 161:

  HTHA is dependant on temperature, hydrogen partial pressure, time and _________.

  A. Pressure

  B. Stress

  C. Yield

  D. Tensile strength

  Correct Answer: B

• Question 162:

  Titanium should not be used in known hydriding services such as _____ or ______.

  A. Caustic, amine

  B. Amine, sour water

  C. Sour water, Alkylation

  D. All of the above

  Correct Answer: B

• Question 163:

  Resistance to sulfidation increases as the:

  A. Chromium content in the material increases.

  B. Nickel content in the material increases.

  C. Material's tensile strength decreases.

  D. Material's tensile strength increases.

  Correct Answer: A

• Question 164:

  A form of fatigue cracking in which cracks develop under the combined effects of cyclic loading and corrosion is called _______. Cracking often initiates at stress concentrations such as a pit in the surface.

  A. Cyclic cracking

  B. Corrosion fatigue

  C. Stress fatigue

  D. Stress cracking

  Correct Answer: B

• Question 165:

  Fatigue will not occur in carbon steel if stresses are below the:

  A. Transition limit.

  B. Endurance limit.

  C. Hardening limit.

  D. Speed limit.

  Correct Answer: B

• Question 166:

  Stresses acting on the weldments are significantly ________ when austenitic stainless steel filler metal is used. A nickel based filler metal has a coefficient of thermal expansion closer to carbon steel resulting in significantly lower stress at elevated temperatures.

  A. Lower

  B. Higher

  C. Altered

  D. None of the above

  Correct Answer: B

• Question 167:

  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

  Correct Answer: A

• Question 168:

  Sulfidation is primarily caused by:

  A. Impacting particles.

  B. Sulfur compounds decomposing at higher temperatures.

  C. Sulfur compounds being created in the FCCU (Cat Cracking Unit).

  D. Elemental sulfur collecting in stagnate areas, e.g. dead legs.

  E. Operators failing to adequately control the ph of sulfur streams.

  Correct Answer: B

• Question 169:

  Thermal fatigue is caused by:

  A. Cyclic stresses that come from temperature variations.

  B. Long term operation at elevated temperatures.

  C. Excessive thermal growth.

  D. Hours of physical activity during a hot summer day.

  Correct Answer: A

• Question 170:

  What is the chemical symbol for propane or propylene?

  A. C²

  B. C3

  C. C4

  D. CH4

  Correct Answer: B