2024年最新のAPI-571問題集を試そう！更新されたAPI試験合格させます
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質問 # 105
Hydrogen permeation or diffusion rates have been found to be minimal at pH _______ and increase at both higher and lower pH's.
- A. 0
- B. 1
- C. 2
- D. 3
正解：C
質問 # 106
SCC generally occurs below about _______.
- A. 180º F
- B. 240º F
- C. 210º F
- D. 150º F
正解：A
質問 # 107
The creep threshold temperature for carbon steel is ________.
- A. 538º C
- B. 426º C
- C. 315º C
- D. 371º C
正解：D
質問 # 108
Metal dusting is preceded by ________ and is characterized by rapid metal wastage.
- A. None of the above
- B. Decarburization
- C. Carburization
- D. Graphitization
正解：C
質問 # 109
_________ is the sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation.
- A. Thermal fatigue
- B. Thermal shock
- C. Stress fracture
- D. Brittle fracture
正解：D
質問 # 110
____________ is a form of environmental cracking that can initiate on the surface of high strength low alloy steels and carbon steels with highly localized zones of high hardness in the weld metal and HAZ as a result of exposure to aqueous HF acid service.
- A. Sulfide stress cracking
- B. Hydrogen induced cracking
- C. Hydrogen stress cracking
- D. Caustic stress cracking
正解：C
質問 # 111
All piping and equipment exposed to HF acid at any concentration with hardness levels
above ________ are subject to hydrogen stress cracking.
- A. 210 BHN
- B. 200 BHN
- C. 227 BHN
- D. 237 BHN
正解：D
質問 # 112
Steel cleanliness and _______ have a significant influence on toughness and resistance to brittle fracture.
- A. Composition
- B. None of the above
- C. Alloy
- D. Grain size
正解：D
質問 # 113
Carbonate stress corrosion cracking usually occurs at welds or cold worked areas that __________.
- A. Have not been stressed relieved
- B. Have been stressed relieved
- C. Have high residual stress
- D. Have high-applied stress
正解：C
質問 # 114
Different organisms thrive on different nutrients including inorganic substances (Sulfur, H(2)S), and organic substances (Hydrocarbons, Organic acids). In addition, all organisms require a source of carbon, nitrogen and _______ for growth.
- A. Manganese
- B. Oxygen
- C. Water
- D. Phosphorous
正解：D
質問 # 115
________ is a form of carbon that may promote carburization, particularly during decoke cycles where temperatures exceed the normal operating temperatures.
- A. None of the above
- B. Carbonic acid
- C. Crude oil
- D. Coke
正解：D
質問 # 116
Low creep ductility is _____ prevalent at the lower temperatures in the creep range. Or low stresses in the upper creep range.
- A. None of the above
- B. More
- C. Less
- D. Equally
正解：B
質問 # 117
The presence of _________ can destabilize the scale and turn it into a nonprotective scale.
- A. O(2)
- B. H(2)
- C. H(2)S
- D. H(2)O
正解：D
質問 # 118
Cracks associated with brittle fracture will typically be _________.
- A. Branching
- B. Straight
- C. Perpendicular
- D. Jagged
正解：B
質問 # 119
In vessels and piping, creep cracking can occur where high metal temperatures and _________ occur together.
- A. None of the above
- B. Stress concentrations
- C. Velocities
- D. Pressures
正解：B
質問 # 120
Thermal fatigue cracks usually:
- A. Grow very rapidly (at the speed of sound in the material).
- B. Initiate in the subsurface of the component.
- C. Initiate on the surface of the component.
- D. Are very tight and narrow.
正解：C
質問 # 121
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.
- A. Minimum pressure
- B. Maximum pressure
- C. Pressure/vapor ratio
- D. Vapor pressure
正解：D
質問 # 122
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