Online Access Free API.API-571.v2026-04-20.q208 Practice Test (Page 28)

API-571 Exam Question 131

At elevated temperature, the carbide phases in certain carbon steels are unstable and may decompose into _______. This decomposition is known as graphitization.

A.Silicon

B.Graphite dust

C.Graphite nodules

D.Carbon dust

API-571 Exam Question 132

SOHIC is driven by localized stresses so that __________ is somewhat effective in preventing SOHIC damage.

A.PWHT

B.Preheat

C.Temperature

D.None of the above

API-571 Exam Question 133

_________ acid is most often used as a catalyst in polymerization units.

A.Naphthenic

B.Sulfuric

C.Polythionic

D.Phosphoric

API-571 Exam Question 134

Which of the following materials are affected by mechanical fatigue cracking?

A.Only carbon steel, and high nickel alloys

B.All materials

C.Only carbon steel and chromes

D.Only carbon steel

API-571 Exam Question 135

Which of the following are susceptible to thermal fatigue?

A.All of the above

B.SA-182 Gr B

C.SA-53 Gr B

D.SA-516-70

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