API API-571 Exam
Corrosion and Materials Professional (Page 8 )

Updated On: 7-Feb-2026

Carbonate stress corrosion cracking usually occurs at welds or cold worked areas that __________.

  1. Have been stressed relieved
  2. Have not been stressed relieved
  3. Have high residual stress
  4. Have high-applied stress

Answer(s): C



Nitriding is usually confined to the surface of most components and will have a dull, ______ appearance. In more advanced stages, the material will exhibit very hard surface hardness.

  1. Gray
  2. Black
  3. Brown
  4. White

Answer(s): A



Carbon steel is susceptible to SCC when used in ___________ service.

  1. Hydrogen
  2. Ammonia
  3. High temperature
  4. High pressure

Answer(s): B



The grain size has an important influence on the high temperature ductility and on the reheat cracking susceptibility. A ________ grain size results in _______ ductile heat affected zones, making the material more susceptible to reheat cracking.

  1. Large, more
  2. Small. Less
  3. Large, Less
  4. Small, More

Answer(s): C



Equipment that is temper embrittled may be susceptible to _______ during start-up and shutdown.

  1. Creep
  2. Thermal fatigue
  3. Brittle fracture
  4. Stress fatigue

Answer(s): C



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