Free Access API.API-571.v2025-12-13.q120 Practice Test (Page 24)

Question 111

Which of these cast irons are not susceptible to graphitic corrosion?

A.Gray cast iron

B.White cast iron

C.Black Cast iron

D.None of the above

Question 112

Sulfidation is also known as ____________.

A.None of the above

B.Sulfidic corrosion

C.Sulfate corrosion

D.Sulfur corrosion

Question 113

Typical HF Alkylation units operate with 1% to 3% water in the acid, equivalent to an HF-inwater concentration of 97% to 99% and the temperatures are generally below _________.

A.200(o) F

B.250(o) F

C.150(o) F

D.300(o) F

Question 114

Which of the following is not a prime candidate for thermal fatigue?

A.600 psig steam piping

B.Welds joining materials having different coefficients of expansion

C.Steam actuated soot blowers

D.Coke drums

E.Mix points of hot and cold streams

Question 115

Which of the following is the lowest threshold temperature at which creep damage is a concern in carbon steel with tensile strength > 60ksi (414 MPa)?

A.600°F (316°C)

B.700°F (371°C)

C.800°F (427°C)

D.900°F (482°C)

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Question 111

Question 112

Question 113

Question 114

Question 115

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