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Reliable API-571 Exam Vce & Exam API-571 Forum

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API Corrosion and Materials Professional Sample Questions (Q62-Q67):

NEW QUESTION # 62
Erosion-corrosion is a description for the damage that occurs when corrosion contributes to erosion by removing protective films or scales, or by exposing the metal surface to further ________ under the combined action of corrosion-erosion.

A. Oxidation
B. Corrosion
C. Stress
D. None of the above

Answer: B

NEW QUESTION # 63
___________ is the result of cyclic stresses caused by variations in temperature.

A. Cyclic cracking
B. Stress cracking
C. Thermal fatigue
D. Stress fatigue

Answer: C

NEW QUESTION # 64
To prevent hydrogen embrittlement, use lower strength steels and _________ to temper the microstructure, improve ductility and reduce residual stresses.

A. All of the above
B. PWHT
C. Preheat
D. Alloys

Answer: B

NEW QUESTION # 65
Corrosion rates of carbon steel pipe in sulfuric acid service increase significantly:

A. At acid concentrations above 95%
B. In stagnant conditions
C. At acid concentrations below 65%
D. At acid concentrations above 65%

Answer: C

Explanation:
According to API RP 571, under Sulfuric Acid Corrosion:
"The most aggressive corrosion typically occurs below 65% H#SO#, particularly between 20% to 50% concentration range."
"Above 95% concentration, sulfuric acid becomes less corrosive to carbon steel due to its dehydrating nature."
"Dilute sulfuric acid is highly ionized and conducts electricity well, increasing corrosion rates." (Reference: API RP 571, Section 4.3.3.2 - Sulfuric Acid Corrosion) Hence, the most severe corrosion occurs below 65% concentration, making option B the accurate answer.

NEW QUESTION # 66
Sour water corrosion in _________ containing environments may be accompanied by carbonate SCC.

A. H(2)S
B. CO(2)
C. O(2)
D. H(2)O

Answer: B

NEW QUESTION # 67
......

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Sid Lee Sid Lee

Biography

Reliable API-571 Exam Vce & Exam API-571 Forum

Exam API API-571 Forum & API-571 New Exam Camp

API Corrosion and Materials Professional Sample Questions (Q62-Q67):

API API-571 Exam Questions Are Out - Download And Prepare [2025]

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