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Corrosion and Materials Professional (API-571) - API Exam Questions

Last updated on July 22, 2026

97% Exam Compliance
149 Total Questions
1
Question
Nitriding of steels becomes most severe at temperatures above:
Options
A 900°F (480°C)
B 500°F (260°C)
C 200°F (95°C)
D 600°F (315°C)
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2
Question
In what damage mechanism does hydrogen combine with carbides in steel to form bubbles or cavities of CH₄?
Options
A High temperature hydrogen attack
B Hydrogen blistering
C Hydrogen-induced cracking
D Hydrogen embrittlement
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3
Question
(A metal cracks because of stress relaxation during postweld heat treatment (PWHT) of a heavy wall section. This type of cracking is best categorized as:)
Options
A Temper embrittlement cracking
B Thermal fatigue cracking
C Reheat cracking
D PWHT cracking
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4
Question
Which of the following will be most effective in finding sour water corrosion?
Options
A Angle beam ultrasonic testing
B Profile radiographic testing
C Spot ultrasonic testing
D Guided wave ultrasonic testing
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5
Question
Microbiologically induced corrosion is largely independent of the:
Options
A Velocity of the flow stream
B Presence of hydrogen sulfide
C Water content of the process
D pH of the fluid
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