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Free API-571 Exam Braindumps (page: 50)

Page 49 of 114
PDF with 454 Questions

Which of the following materials is affected by high temperature corrosion?

  1. Carbon steel
  2. 300 Series SS
  3. 400 Series SS
  4. All of the above

Answer(s): D



For some materials such as titanium, carbon steel and low alloy steel, the number of cycles to fatigue fracture decreases with ________ until an endurance limit is reached. Below this endurance limit, fatigue cracking will not occur, regardless of the number of cycles.

  1. Temperature increases
  2. Stress endurance
  3. Pressure decreases
  4. None of the above

Answer(s): B



In HF service, carbon steel forms a protective fluoride scale in dry concentrated acid. Loss of the protective scale through high _________ or turbulence will result in greatly accelerated corrosion rates.

  1. Temperature
  2. Pressure
  3. Velocities
  4. None of the above

Answer(s): C



Oxidation of carbon steel begins to become significant above _________.

  1. 800º F
  2. 900º F
  3. 1000º F
  4. 1100º F

Answer(s): C






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