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Home API API-571

API API-571 Exam Practice Questions (P. 5)

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Question #41
Which API RP recommends programs to monitor small-bore piping, flange faces, blistering and HIC/SOHIC in HF alky units?
  1. A
    574
  2. B
    751
  3. C
    571
  4. D
    980

Correct Answer:
B

Question #42
Low creep ductility is __________ severe in high tensile strength materials and welds.
  1. A
    More
  2. B
    Less
  3. C
    Usually
  4. D
    Not

Correct Answer:
A

Question #43
_________ is most likely found in hard weld and heat-affected zones and in high strength components.
  1. A
    HIC
  2. B
    SSC
  3. C
    SOHIC
  4. D
    Blistering

Correct Answer:
B

Question #44
At elevated temperature, the carbide phases in certain carbon steels are unstable and may decompose into _______. This decomposition is known as graphitization.
  1. A
    Silicon
  2. B
    Graphite nodules
  3. C
    Carbon dust
  4. D
    Graphite dust

Correct Answer:
B

Question #45
Hydrogen blisters may form as surface bulges on the ID, the OD on within the wall thickness of a pipe or pressure vessel. Blistering occurs from hydrogen generated by ______, not hydrogen gas from the process stream.
  1. A
    H²S
  2. B
    Corrosion
  3. C
    Hydriding
  4. D
    Sulfur

Correct Answer:
B

Question #46
Since all fuels contain some amount of sulfur, sulfuric and sulfurous acid __________ can occur if the metal temperature is below this temperature.
  1. A
    Corrosion
  2. B
    Pitting
  3. C
    Dew point corrosion
  4. D
    All of the above

Correct Answer:
C

Question #47
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. A
    Austenite
  2. B
    Martensite
  3. C
    Ferrite
  4. D
    Chromium

Correct Answer:
C

Question #48
The amplitude and frequency of vibration as well as the _________ of the components are critical factors in vibration-induced fatigue.
  1. A
    Velocity
  2. B
    Temperature
  3. C
    Fatigue resistance
  4. D
    Material properties

Correct Answer:
C

Question #49
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. A
    Minimum pressure
  2. B
    Pressure/vapor ratio
  3. C
    Maximum pressure
  4. D
    Vapor pressure

Correct Answer:
D

Question #50
Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF). Time-to-failure decreases as the hardness increases.
  1. A
    225 BHN
  2. B
    237 BHN
  3. C
    241 BHN
  4. D
    247 BHN

Correct Answer:
B

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