Corrosion and Materials Professional (API-571) Free Practice Test

Question 1

(Which of the following damage mechanisms affects most common materials of construction?)

A. Microbiologically induced corrosion

B. Amine corrosion

C. Polythionic acid corrosion

D. Sour water corrosion

Correct Answer: A

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Question 2

Which type of corrosion is most likely to occur in hydroprocess reactor effluent streams in units producing alkaline sour water?

A. Amine

B. Ammonium chloride

C. Ammonium bisulfide

D. Caustic

Correct Answer: C

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Question 3

Proactive and retroactive positive material identification programs are especially useful for services exposed to:

A. Sour water

B. Ammonia stress corrosion cracking

C. Sulfidation

D. Caustic embrittlement

Correct Answer: C

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Question 4

The primary cause of ammonium chloride corrosion is the formation of salts:

A. During water washing operations in streams containing traces of chlorides

B. That may precipitate from high-temperature streams as they are cooled

C. That may deposit when water evaporates to dry-out conditions as streams are heated

D. When steam is injected into streams containing traces of chlorides

Correct Answer: B

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Question 5

Which of the following is a critical factor for chloride stress corrosion cracking?

A. Use in an alkaline pH region

B. Presence of nickel content less than 8%

C. Presence of nickel content higher than 35%

D. Presence of oxygen

Correct Answer: D

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Question 6

(Which of the following is the appropriate method for monitoring hydrochloric acid corrosion susceptibility in an atmospheric crude unit?)

A. Ultrasonic thickness measurements of water injection points

B. Using strategically placed corrosion probes or corrosion coupons

C. Measuring the pH of the water in the boot of the overhead accumulator

D. Manual or automatic ultrasonic scanning or profile radiographing of piping, vessels, and exchangers in the system

Correct Answer: C

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Question 7

Steel hardness and strength are critical factors for what type of damage mechanism?

A. Amine stress corrosion cracking

B. Carbonate corrosion stress cracking

C. Hydrogen stress cracking-HF

D. Polythionic acid cracking

Correct Answer: C

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Question 8

Cooling water corrosion of exchanger tubes is typically increased by:

A. Increasing the oxygen content.

B. Decreasing the process temperature.

C. Increasing the passivation layer.

D. Decreasing the cooling water outlet temperature.

Correct Answer: A

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Question 9

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

A. Weld hardness above 200 BHN

B. High nitrogen content in process

C. HF acid concentration above 98%

D. Oxygen contamination

Correct Answer: A

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Question 10

(Which of the following may be more susceptible to polythionic acid stress corrosion cracking?)

A. Monel 400

B. Type 304 stainless steel

C. SA-516 Grade 70 carbon steel

D. Type 321 stainless steel

Correct Answer: B

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Question 11

Aggressive ammonium chloride corrosion often occurs:

A. In the absence of a free water phase.

B. When excess water washing dissolves too much ammonium chloride.

C. When dry salts are exposed to a small amount of free water.

D. When the salts precipitate from high-temperature streams as they cool.

Correct Answer: C

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Question 12

(Refractory materials can suffer what forms of degradation in service?)

A. Nitriding and embrittlement

B. Sulfidation and oxidation

C. Carburization and fuel ash corrosion

D. Refractory dusting and checking

Correct Answer: D

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Question 13

The 300 series stainless steels (austenitic stainless steels) are generally resistant to oxidation up to what temperature?

A. 1500°F (815°C)

B. 1400°F (760°C)

C. 1300°F (704°C)

D. 1600°F (871°C)

Correct Answer: A

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Question 14

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

A. Type 304L stainless steel

B. Alloy 800H

C. Type 310 stainless steel

D. 9 Cr low-alloy steel

Correct Answer: D

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API Corrosion and Materials Professional (API-571) Free Practice Test