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Home API API-571

API API-571 Exam Practice Questions (P. 4)

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Question #31
Carbonate stress corrosion cracking usually occurs at welds or cold worked areas that __________.
  1. A
    Have been stressed relieved
  2. B
    Have not been stressed relieved
  3. C
    Have high residual stress
  4. D
    Have high-applied stress

Correct Answer:
C

Question #32
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. A
    Gray
  2. B
    Black
  3. C
    Brown
  4. D
    White

Correct Answer:
A

Question #33
Carbon steel is susceptible to SCC when used in ___________ service.
  1. A
    Hydrogen
  2. B
    Ammonia
  3. C
    High temperature
  4. D
    High pressure

Correct Answer:
B

Question #34
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. A
    Large, More
  2. B
    Small, Less
  3. C
    Large, Less
  4. D
    Small, More

Correct Answer:
C

Question #35
Equipment that is temper embrittled may be susceptible to _______ during start-up and shutdown.
  1. A
    Creep
  2. B
    Thermal fatigue
  3. C
    Brittle fracture
  4. D
    Stress fatigue

Correct Answer:
C

Question #36
Amine stress corrosion cracking is a term applied to the cracking of steels under the combined actions of ________ and __________ in aqueous alkanolamine systems used to remove/absorb H²S and/or CO² and their mixtures from various gas and liquid hydrocarbon streams.
  1. A
    Temperature, pressure
  2. B
    Pressure, stress
  3. C
    Temperature, corrosion
  4. D
    Tensile stress, corrosion

Correct Answer:
D

Question #37
______ is similar to HIC but is a potentially more damaging form of cracking which appears as arrays of cracks stacked on top of each other. The result is a through thickness crack that is perpendicular to the surface and is driven by high levels of stress.
  1. A
    MIC
  2. B
    SOHIC
  3. C
    Sulfuric SCC
  4. D
    None of the above

Correct Answer:
B

Question #38
Weld heat affected zone graphitization is most frequently found in the heat affected zone adjacent to welds in a narrow band, corresponding to the low temperature edge of the heat affected zone. In multi-pass welded butt joints, these zones overlap each other covering the entire cross section. Because of its appearance, this type of graphitization is called________.
  1. A
    Half-moon
  2. B
    Eyebrow
  3. C
    Radii
  4. D
    None of the above

Correct Answer:
B

Question #39
At a given pressure, the H²S concentration in the sour water _________ as temperature _________.
  1. A
    Increases, increases
  2. B
    Decreases, decreases
  3. C
    Increases, decreases
  4. D
    Decreases, increases

Correct Answer:
D

Question #40
In order for PASCC to occur the material must be ______.
  1. A
    PWHT
  2. B
    Non-PWHT
  3. C
    Sensitized
  4. D
    Austenitic

Correct Answer:
C

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