API Corrosion and Materials Professional API-571 Dumps in PDF

Free API API-571 Real Questions (page: 10)

Since all fuels contain some amount of sulfur, sulfuric and sulfurous acid __________ can occur if the metal temperature is below this temperature.

  1. Corrosion
  2. Pitting
  3. Dew point corrosion
  4. All of the above

Answer(s): C



The best way to prevent 885º F embrittlement is to use low ________ alloys, or to avoid exposing the susceptible material to the embrittling range.

  1. Austenite
  2. Martensite
  3. Ferrite
  4. Chromium

Answer(s): C



The amplitude and frequency of vibration as well as the _________ of the components are critical factors in vibration-induced fatigue.

  1. Velocity
  2. Temperature
  3. Fatigue resistance
  4. Material properties

Answer(s): 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.

  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



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