API-571 by API Actual Free Exam Q&As

Question 1

The form of corrosion most often caused by sulfidation is typically described as:

A. General or uniform corrosion B. High-temperature corrosion C. Sulfide cracking corrosion D. Localized erosion-corrosion

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Correct Answer: A Vote an answer

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Question 2

Which of the following can cause hydrogen embrittlement of carbon steel?

A. Welding with wet electrodes B. High-temperature hydrogen attack (HTHA) C. Cleaning and pickling in caustic solutions D. Improper postweld heat treatment (PWHT)

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Correct Answer: D Vote an answer

Question 3

Caustic corrosion is most often associated with:

A. Boilers and steam generating equipment B. Caustic storage tanks (non-postweld heat treated) C. Caustic injections in crude units D. Caustic treaters

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Correct Answer: C Vote an answer

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Question 4

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. sulfide stress cracking. B. original weld defect. C. thermal overload. D. mechanical fatigue.

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Correct Answer: D Vote an answer

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Question 5

(Amine cracking is most often associated with which services?)

A. Amine solutions below 140 °F (60 °C) B. High concentration amines C. Lean amine D. Rich amine

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Correct Answer: D Vote an answer

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Question 6

Which of the following can increase the corrosion rate of carbon steel via hydrofluoric (HF) acid corrosion?

A. Oxygen contamination B. HF acid concentration above 98% C. Weld hardness above 200 BHN D. High nitrogen content in process

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Correct Answer: C Vote an answer

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Question 7

Differential expansion in bimetallic welds can give rise to:

A. Galvanic cracking B. Stress corrosion cracking C. Reheat cracking D. Thermal fatigue

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Correct Answer: D Vote an answer

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Question 8

(Which three residual alloy elements are of most concern when it comes to corrosion of carbon steel in HF Alkylation process units?)

A. C / Nb / V B. Cr / Cu / Ni C. Cu / S / V D. Cr / Mo / Ni

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Correct Answer: B Vote an answer

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Question 9

In what damage mechanism does hydrogen combine with carbides in steel to form bubbles or cavities of CH#?

A. Hydrogen-induced cracking B. Hydrogen embrittlement C. Hydrogen blistering D. High temperature hydrogen attack

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Correct Answer: D Vote an answer

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Question 10

Which of the following will be most effective in finding sour water corrosion?

A. Spot ultrasonic testing B. Angle beam ultrasonic testing C. Guided wave ultrasonic testing D. Profile radiographic testing

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Correct Answer: D Vote an answer

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Question 11

(Cooling water corrosion usually increases with decreasing:)

A. Velocities B. Process temperatures C. Microbiological activity D. Oxygen content

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Correct Answer: A Vote an answer

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API Corrosion and Materials Professional - API-571 Exam Practice Test