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Home API API-571

API API-571 Exam Practice Questions (P. 3)

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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. A
    Stress corrosion cracking
  2. B
    Brittle fracture
  3. C
    Thermal fatigue
  4. D
    Temper embrittlement

Correct Answer:
B

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. A
    Creep
  2. B
    Ductility
  3. C
    Softening
  4. D
    Hardening

Correct Answer:
A

Question #23
Permanent deformation occurring at relatively low stress levels as a result of localized overheating is called ________.
  1. A
    Stress cracking
  2. B
    Brittle fracture
  3. C
    Temper embrittlement
  4. D
    Stress rupture

Correct Answer:
D

Question #24
_____________ usually occurs when a colder liquid contacts a warmer metal surface.
  1. A
    Brittle fracture
  2. B
    Thermal fatigue
  3. C
    Thermal shock
  4. D
    Stress rupture

Correct Answer:
C

Question #25
Nickel based alloys usually contain ________ nickel.
  1. A
    ≥30%
  2. B
    ≥20%
  3. C
    ≥10%
  4. D
    ≥12%

Correct Answer:
A

Question #26
_________ is a change in the microstructure of certain carbon steels and 0.5Mo steels after long-term operation in the 800º F to 1100º F range that may cause a loss in strength, ductility and/or creep resistance.
  1. A
    Embrittlement
  2. B
    Carburization
  3. C
    Graphitization
  4. D
    Sensitization

Correct Answer:
C

Question #27
__________ is usually found in aqueous environments or services where water is sometimes or always present, especially where stagnant or low-flow conditions allow the growth of microorganisms.
  1. A
    MIC
  2. B
    HIC
  3. C
    SOHIC
  4. D
    None of the above

Correct Answer:
A

Question #28
With chloride stress corrosion cracking, __________ temperatures ________ the susceptibility for cracking.
  1. A
    Decreasing, Increases
  2. B
    Increasing, Increases
  3. C
    Increasing, Decreases
  4. D
    Decreasing, Eliminates

Correct Answer:
B

Question #29
__________ is a form of cracking that results when certain molten metals come in contact with specific alloys. Cracking can be very sudden and brittle in nature.
  1. A
    SCC
  2. B
    LME
  3. C
    AET
  4. D
    SOHIC

Correct Answer:
B

Question #30
Amine cracking has been reported down to ambient temperatures with some amines. __________ temperatures and stress levels _______ the likelihood and severity of cracking.
  1. A
    Increasing increases
  2. B
    Increasing, decreases
  3. C
    Decreasing increases
  4. D
    Increasing, reduces

Correct Answer:
A

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