API-571

API-571 practice questions, page 5 of 18, with answer review and explanations.

Question 21

Cracks that are typically straight, non-branching, and devoid of any associated plastic deformation are likely associated with which type of failure?

  1. Stress corrosion cracking
  2. Brittle fracture
  3. Thermal fatigue
  4. Temper embrittlement

Question 22

At high temperatures, metal components can slowly and continuously deform under load below the yield strength. This time dependent deformation of stressed components is known as _______?

  1. Creep
  2. Ductility
  3. Softening
  4. Hardening

Question 23

Permanent deformation occurring at relatively low stress levels as a result of localized overheating is called ________.

  1. Stress cracking
  2. Brittle fracture
  3. Temper embrittlement
  4. Stress rupture

Question 24

_____________ usually occurs when a colder liquid contacts a warmer metal surface.

  1. Brittle fracture
  2. Thermal fatigue
  3. Thermal shock
  4. Stress rupture

Question 25

Nickel based alloys usually contain ________ nickel.

  1. ≥30%
  2. ≥20%
  3. ≥10%
  4. ≥12%