Free Access API.API-571.v2025-12-13.q120 Practice Test (Page 5)

Question 16

With sour water corrosion, at a given pressure, the H²S concentration in the sour water _________ as temperatures ________.

A.Decreases, decreases

B.Decreases, increases

C.Increases, decreases

D.Increases, increases

Question 17

The most common method used for monitoring underground structures is measuring the structure to soil ______ using dedicated reference electrodes near the structure.

A.Electrolyte

B.Potential

C.Corrosiveness

D.Resistivity

Question 18

Annealed steels are more resistant to Spheroidization than normalized steels. _________ grained steels are more resistant than ______ grained steels.

A.PWHT, Non-PWHT

B.Fine, Course

C.Course, Fine

D.Non-PWHT, PWHT

Question 19

Corrosion of the anode may be significantly higher ________ to the connection to the cathode, depending on solution conductivity.

A.Perpendicular

B.Parallel

C.Adjacent

D.Diagonally

Question 20

Which of the following will experience the highest oxidation corrosion rate at 1350°F (732°C)?

A.Alloy 800H

B.Type 310 stainless steel

C.Type 304L stainless steel

D.9 Cr low-alloy steel

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