(Which of the following is the most important factor in determining carbon steel susceptibility to ethanol stress corrosion cracking in storage tanks?)
A. Grade of steel
B. Amount of aeration
C. Moisture content
D. Ethanol percentage
正解:C
解説: (Pass4Test メンバーにのみ表示されます)
質問 2:
Which of the following damage mechanisms is related to steel hardness?
A. Hydrogen blistering
B. Stress-oriented hydrogen-induced cracking
C. Sulfide stress corrosion cracking
D. Hydrogen-induced cracking
正解:C
解説: (Pass4Test メンバーにのみ表示されます)
質問 3:
An NPS 3/4 (DN 20) carbon steel unsupported high-point vent on a steam line has failed by cracking.
The most likely cause is:
A. original weld defect.
B. thermal overload.
C. sulfide stress cracking.
D. mechanical fatigue.
正解:D
解説: (Pass4Test メンバーにのみ表示されます)
質問 4:
Which of the following is related to all wet H#S damage mechanisms?
A. pH of <7 with dissolved H#S present
B. Absorption and permeation of hydrogen
C. Localized zones of weld HAZ hardness above 200 HB
D. Water vapor in the hydrocarbon phase
正解:B
解説: (Pass4Test メンバーにのみ表示されます)
質問 5:
Which of the following is most susceptible to chloride stress corrosion cracking?
A. Non-stress-relieved 304 stainless steel
B. Non-postweld heat-treated carbon steel
C. Non-stress-relieved admiralty brass U-bends
D. Inadequately heat-treated 1.25 Cr-0.5 Mo low-alloy steel
正解:A
解説: (Pass4Test メンバーにのみ表示されます)
質問 6:
(Amine cracking is most often associated with which services?)
A. Amine solutions below 140 °F (60 °C)
B. High concentration amines
C. Rich amine
D. Lean amine
正解:C
解説: (Pass4Test メンバーにのみ表示されます)
質問 7:
(Concentration Cell Corrosion is best described as corrosion:)
A. In the presence of dissimilar metals in electrical contact in a corrosive environment
B. At high temperatures in the presence of sulfur compounds
C. Where deposits form within piping or equipment
D. By mechanical stress and fatigue in metal structures
正解:C
解説: (Pass4Test メンバーにのみ表示されます)
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