API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 251:

  ASME Section VIII had few limitations concerning brittle fracture prior to:

  A. 1955.
  B. 1962.
  C. 1973.
  D. 1987.
  D. 1987.

• Question 252:

  In susceptible materials, the primary factor that affects sigma phase formation is the ________ at elevated temperatures.

  A. Time of exposure
  B. Pressure
  C. Stress
  D. Velocity
  A. Time of exposure

• Question 253:

  Graphitization can be prevented by using chromium containing low alloys steels for long- term exposure above ________.

  A. 650?F
  B. 700?F
  C. 750?F
  D. 800?F
  D. 800?F

• Question 254:

  For pressure vessels, inspection should focus on welds of ________ operating in the creep range.

  A. CrMo alloys
  B. Carbon steel
  C. Stainless steel
  D. Low hydrogen electrodes
  A. CrMo alloys

• Question 255:

  In piping and equipment, creep cracking can occur where high metal temperatures and _________ occur together. Creep cracking, once initiated, can progress rapidly.

  A. Pressures
  B. Stress risers
  C. Velocities
  D. None of the above
  B. Stress risers

• Question 256:

  If wet electrodes or high moisture content flux is used, ________ can be charged into the steel resulting in delayed cracking.

  A. Atomic hydrogen
  B. Hydrogen
  C. Oxygen
  D. H睴
  B. Hydrogen

• Question 257:

  The endurance limit is usually about:

  A. 10-20% of a material's ultimate tensile strength.
  B. 40-50% of a material's ultimate tensile strength
  C. 10-20% of a material's yield strength.
  D. 40-50% of a material's yield strength.
  E. Half way up the ladder of a 150' column (tower).
  B. 40-50% of a material's ultimate tensile strength

• Question 258:

  Carbon steel and low alloy steels are subject to excessive hydrochloric acid corrosion when exposed to any concentration of HCl acid that produces a pH below______.

  A. 6.0
  B. 5.5
  C. 5.0
  D. 4.5
  D. 4.5

• Question 259:

  Carbon dioxide corrosion results when CO?dissolves in water to form _________ acid.

  A. Sulfuric
  B. Hydrochloric
  C. Carbonic
  D. None of the above
  C. Carbonic

• Question 260:

  (Repeated) The best method for finding damage from sigma phase embrittlement is:

  A. Hardness testing
  B. Ductility testing
  C. Magnetic particle testing
  D. Metallographic testing
  D. Metallographic testing

  ---

  Same as above. Sigma phase formation is a microstructural phenomenon and not typically detected by NDE methods like magnetic particle or surface hardness testing. Therefore, metallographic testing remains the definitive detection method, confirming option D again as the correct answer.