Free API API-571 Exam Dumps Questions & Answers

Cracks formed by carbonate stress corrosion are best detected:

• A.  with a penetrant testing technique used after abrasive or high pressure water blasting of the surface.
• B.  with an Acoustic Emission Testing technique.
• C.  with a wet fluorescent magnetic-particle testing technique.
• D.  ultrasonic shear wave examination because cracks develop internally.

Polythionic acid stress corrosion cracking (PTASCC) can be detected by:

• A.  Ultrasonic thickness measurements
• B.  Liquid penetrant testing
• C.  Hardness measurements
• D.  Magnetic particle testing

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

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

Carbonate stress corrosion cracking and alkaline stress corrosion cracking are:

• A.  Closely related corrosion mechanisms.
• B.  Different only in the level of alkalinity needed to initiate attack.
• C.  Mechanisms that affect carbon steels and austenitic stainless steels.
• D.  Not preventable by post-fabrication stress relieving of weldments.

Microbiologically induced corrosion is largely independent of the:

• A.  Water content of the process
• B.  Velocity of the flow stream
• C.  Presence of hydrogen sulfide
• D.  pH of the fluid