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Free API-571 Exam Braindumps (page: 14)

Page 13 of 114
PDF with 454 Questions

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.

  1. Minimum pressure
  2. Pressure/vapor ratio
  3. Maximum pressure
  4. Vapor pressure

Answer(s): D



Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF).Time-to- failure decreases as the hardness increases.

  1. 225 BHN
  2. 237 BHN
  3. 241 BHN
  4. 247 BHN

Answer(s): B



__________ are the most common type of equipment susceptible to carburization in the refining industry.

  1. Reactors
  2. Heat exchangers
  3. Heater tubes
  4. Fin Fans

Answer(s): 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.

  1. Oxygen
  2. Water
  3. Manganese
  4. Phosphorous

Answer(s): D






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