API 571 PRACTICE EXAM QUESTIONS WITH VERIFIED CORRECT ANSWERS

The Best way to prevent 885°F embrittlement is to use low ____ alloys, or to avoid exposing the susceptible material to the embrittlement range. A. Austenite B. Martensite C. Ferrite D. Chromium - correct answers C The amplitude and frequency of vibration as well as the ___ of the components are critical factors in vibration-induced fatigue. A. Velocity B. Temperature C. Fatigue resistance D. Material properties - correct answers C Cavitation is best prevented by avoiding conditions that allow the absolute pressure to fall below the _____ of the liquid or by changing the material properties. A. Minimum pressure B. Pressure/Vapor ratio C. Maximum pressure D. Vapor pressure - correct answers D Hardness levels above _________ are highly susceptible to hydrogen stress cracking (HF). Time-to-failure decreases as the hardness increases. A. 225 BHN B. 237 BHN C. 241 BHN D. 247 BHN - correct answers B _________ are the most common type of equipment susceptible to carburization in the refining industry. A. Reactors B. Heat exchanges C. Heater tubes D. Fin Fans - correct answers C Different organisms thrive on different nutrients including inorganic substances (Sulfur, H²S), and organic substances (Hydrocarbons, Organic acids). In addition, all organisms require a source of carbon, nitrogen and ____ for growth. A. Oxygen B. Water C. Manganese D. Phosphorous - correct answers D In design and fabrication, it is advisable to avoid sharp changes in cross section, such as short radius fillets or undercut that can give rise to _________. Long-seam welds are particularly susceptible to reheat cracking due to mismatch caused by fit up problems. A. Stress concentrations B. Cracking C. Circumferential stress D. All of the above - correct answers A The most important factors affecting graphitization are the chemistry, stress, temperature and ______. A. Velocity B. Time at exposure C. Pressure D. Ductility - correct answers B Creep damage is found in high temperature equipment operating above the ________. Fired heater tubes and components, Catalytic reactors, FCC reactors and FCC fractionator and regenerator internals all operate in or near this. A. Transition range B. MADT C. Creep range D. None of the above - correct answers C Amine stress corrosion cracking is most often associated with lean amine services. The pure alkanolamine does not cause cracking. Cracking in rich amine services are most often associated with _________ problems. A. H²S B. Stress C. Wet H²S D. Temperature - correct answers C The loss in strength from spheroidization (Softening) is usually accompanied by a(n) _________ in ductility, which allows for deformation at stress concentration. A. Increase B. Decrease C. Reduction D. Yield - correct answers A Which of the following materials is not susceptible to high temperature hydrogen attack? A. 300 Series SS B. 5Cr-1Mo C. 9Cr-1Mo D. All of the above - correct answers D Which of these materials are susceptible to creep damage? A. Carbon Steel B. Stainless Steel C. Low alloy steel D. All of the above - correct answers D High temperature hydrogen attack results from exposure to hydrogen at elevated temperature and pressures. The hydrogen react with _________ in steel to produce _______, which cannot diffuse through steel. The loss of carbides causes an overall loss in strength. A. Carbides, oxygen B. Alloys, hydrogen dioxide C. Carbides, methane D. Hydrogen dioxide, H²S - correct answers C Ferritic stainless steels are usually not used in ________ applications. A. Non-pressure boundary B. Pressure boundary C. High temperature D. Low temperature - correct answers B Stress ruptures are characterized by _________ failures and are usually accompanied by thinning at the fracture surface. A. Rapid B. Fish-mouth C. Tensile D. None of the above - correct answers B With hydrofluoric acid corrosion, corrosion rates increase with ________ temperatures and ________ HF concentrations. A. Increasing, decreasing B. Decreasing, increasing C. Increasing, increasing D. Decreasing, decreasing - correct answers A Which of the following materials is susceptible to CO² corrosion? A. Carbon steel B. Stainless steel C. Duplex stainless steel D. Both B and C - correct answers A 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 answers C If the BHN is 400-500 it may indicate __________.