[2026] API Corrosion and Materials Professional

문제1

In steam-generating equipment, caustic corrosion is best prevented through:

A. use of 300 series stainless steels.

B. acid injection to balance pH.

C. keeping temperature below the maximum of 250°F (120°C).

D. proper design.

정답: A

설명: (Fast2test 회원만 볼 수 있음)

문제2

The potential for galvanic corrosion will increase when:

A. applying a coating to both metals.

B. different metals are in contact with presence of electrolyte.

C. insulating dissimilar metals with different electro-chemical potentials.

D. using a relatively large volume of anodic material.

정답: B

설명: (Fast2test 회원만 볼 수 있음)

문제3

Which of the following inspection methods should primarily be used to identify naphthenic acid corrosion (NAC) in a piping system?

A. Radiographic testing followed by ultrasonic measurements

B. Eddy-current testing

C. Angle-beam ultrasonic testing

D. Radiographic testing followed by angle-beam ultrasonic testing

정답: A

설명: (Fast2test 회원만 볼 수 있음)

문제4

Which damage mechanism will not benefit much from PWHT mitigation?

A. Amine stress corrosion cracking

B. Sulfide stress cracking

C. Hydrogen-induced cracking

D. Carbonate stress corrosion cracking

정답: C

설명: (Fast2test 회원만 볼 수 있음)

문제5

(A section of vacuum bottom outlet piping is being replaced because of naphthenic acid corrosion (NAC).
Which of the following potential replacement materials would be most resistant to NAC?)

A. 9 Cr-1 Mo steel

B. Titanium

C. 317 stainless steel

D. 321 stainless steel

정답: B

설명: (Fast2test 회원만 볼 수 있음)

문제6

Which of the materials listed are not susceptible to Chloride Stress Corrosion Cracking?

A. 8% Nickel Alloys

B. 300 Series Stainless Steel

C. 400 Series Stainless Steel

D. Duplex Stainless Steel

정답: C

설명: (Fast2test 회원만 볼 수 있음)

문제7

Which of the following is the most significant result of spheroidization in steels?

A. Loss of ductility

B. Loss of strength

C. Increased hardness

D. Increased potential for stress corrosion cracking

정답: B

설명: (Fast2test 회원만 볼 수 있음)

문제8

Which of the following generally manifests itself as a subsurface damage mechanism?

A. Amine Stress Corrosion Cracking

B. Stress-Oriented Hydrogen-Induced Cracking (SOHIC)

C. Sulfide Stress Corrosion Cracking (SCC)

D. Caustic Cracking

정답: B

설명: (Fast2test 회원만 볼 수 있음)

문제9

Which of the following is the best description of the surface appearance of metals with chloride stress corrosion cracking?

A. Concentric ring "beach mark" cracking

B. Linear cracking along weld heat-affected zones

C. Highly branched crazed cracking

D. Linear cracking with few branches extending away from welds

정답: C

설명: (Fast2test 회원만 볼 수 있음)

문제10

(Caustic stress corrosion cracking can be effectively prevented by:)

A. Limiting metal temperatures to less than 150 °F (65 °C)

B. Limiting caustic concentration to less than 100 ppm

C. The use of a stress-relieving treatment

D. The use of 300 series stainless steels

정답: C

설명: (Fast2test 회원만 볼 수 있음)

문제11

(Repeated) The best method for finding damage from sigma phase embrittlement is:

A. Hardness testing

B. Ductility testing

C. Metallographic testing

D. Magnetic particle testing

정답: C

설명: (Fast2test 회원만 볼 수 있음)

문제12

For exchangers where the cooling water chemistry is poorly maintained, what can be done to improve corrosion resistance?

A. Lower the water velocity

B. Increase the tube diameter

C. Increase the process side temperature above 212°F (100°C)

D. Upgrade the metallurgy of the exchanger

정답: D

설명: (Fast2test 회원만 볼 수 있음)

문제13

An inspector has discovered significant cracking in a T-joint where hot and cold hydrogen-containing streams are mixing in a hydroprocess unit. What damage mechanism should the inspector suspect is the cause?

A. Hydrogen embrittlement

B. Injection point corrosion

C. Mixing point corrosion

D. Thermal fatigue

정답: D

설명: (Fast2test 회원만 볼 수 있음)

문제14

Which of the following statements about high-temperature hydrogen attack is most accurate?

A. High-temperature hydrogen attack will most often be associated with the formation of surface blisters.

B. Acoustic emission testing is not a proven method for the detection of high-temperature hydrogen attack damage.

C. 300 series stainless steels are also susceptible to high-temperature hydrogen attack at conditions normally seen in refinery units.

D. High-temperature hydrogen attack damage is most often limited to welds and heat-affected zones.

정답: B

설명: (Fast2test 회원만 볼 수 있음)

API Corrosion and Materials Professional - API-571무료 덤프문제 풀어보기

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