Practice Test for API-571 Certification Real 2022 Mock Exam
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NEW QUESTION 172
Sulfidation usually creates:
- A. Uniform corrosion.
- B. Inspection nightmares.
- C. Intergranular cracking.
- D. Transgranular cracking.
- E. Isolated pitting.
- F. Hard and brittle zones.
Answer: A
NEW QUESTION 173
At elevated temperature, the carbide phases in certain carbon steels are unstable and may decompose into _______. This decomposition is known as graphitization.
- A. Silicon
- B. Carbon dust
- C. Graphite dust
- D. Graphite nodules
Answer: D
NEW QUESTION 174
A form of fatigue cracking in which cracks develop under the combined effects of cyclic loading and corrosion is called _______. Cracking often initiates at stress concentrations such as a pit in the surface.
- A. Corrosion fatigue
- B. Cyclic cracking
- C. Stress fatigue
- D. Stress cracking
Answer: A
NEW QUESTION 175
Refractory lined equipment should be designed for erosion, thermal shock and __________.
- A. Thermal fatigue
- B. All of the above
- C. Thermal expansion
- D. Thermal contraction
Answer: C
Explanation:
Explanation
NEW QUESTION 176
Welds joining dissimilar materials (ferritic and austenetic) may suffer __________ related damage at high temperatures due to differential thermal expansion stresses.
- A. Creep
- B. Stress
- C. Fatigue
- D. Thermal stress
Answer: A
NEW QUESTION 177
Which of the following materials are subject to mechanical fatigue?
- A. Stainless steels
- B. All of the above
- C. Carbon steels
- D. Low alloy steels
Answer: B
NEW QUESTION 178
Once cracking from LME has occurred, grinding out the affected area ______ an acceptable fix.
- A. Can be
- B. Is not
- C. Can not be
- D. Is
Answer: B
NEW QUESTION 179
____________ are characterized by a localized loss in thickness in the form of pits, grooves, gullies, waves, rounded holes and valleys. These losses often exhibit a directional pattern.
- A. Corrosion/Erosion
- B. Erosion
- C. Environmental corrosion
- D. Both A and B
Answer: D
NEW QUESTION 180
A brittle fracture:
- A. Is always the result of thermal stresses.
- B. Is caused by stress cycles.
- C. Grows slowly and is dependent on time and stress.
- D. Grow very rapidly with minimum deformation prior to failure.
Answer: D
NEW QUESTION 181
__________ is a form of stress corrosion cracking normally occurring during shutdowns, startups or during operation when air and moisture are present. Cracking is due to sulfur acids forming from sulfide scale, air and moisture acting on sensitized stainless steel.
- A. Polythionic acid SCC
- B. Caustic SCC
- C. None of the above
- D. Chloride SCC
Answer: A
NEW QUESTION 182
__________ is a form of cracking that results when certain molten metals come in contact with specific alloys. Cracking can be very sudden and brittle in nature.
- A. AET
- B. LME
- C. SOHIC
- D. SCC
Answer: B
NEW QUESTION 183
Sour water corrosion in _________ containing environments may be accompanied by carbonate SCC.
- A. CO2
- B. H2S
- C. H2O
- D. O2
Answer: A
NEW QUESTION 184
In piping and equipment, creep cracking can occur where high metal temperatures and _________ occur together. Creep cracking, once initiated, can progress rapidly.
- A. Pressures
- B. None of the above
- C. Velocities
- D. Stress risers
Answer: D
NEW QUESTION 185
With decarburization, the decarburized layer will be free of carbide phases. Carbon steel
will be ______.
- A. None of the above
- B. Pure iron
- C. Annealed
- D. Quenched
Answer: B
NEW QUESTION 186
__________ is usually found in aqueous environments or services where water is sometimes or always present, especially where stagnant or low-flow conditions allow the growth of microorganisms.
- A. MIC
- B. HIC
- C. None of the above
- D. SOHIC
Answer: A
NEW QUESTION 187
At high temperatures, metal components can slowly and continuously deform under load below the yield strength. This time dependent deformation of stressed components is known as _______?
- A. Creep
- B. Softening
- C. Ductility
- D. Hardening
Answer: A
NEW QUESTION 188
_____________ usually occurs when a colder liquid contacts a warmer metal surface.
- A. Stress rupture
- B. Thermal shock
- C. Brittle fracture
- D. Thermal fatigue
Answer: B
NEW QUESTION 189
Sulfidation is also known as ____________.
- A. None of the above
- B. Sulfidic corrosion
- C. Sulfur corrosion
- D. Sulfate corrosion
Answer: B
NEW QUESTION 190
Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF).Time-to-failure decreases as the hardness increases.
- A. 237 BHN
- B. 241 BHN
- C. 225 BHN
- D. 247 BHN
Answer: A
NEW QUESTION 191
A prime location for erosion is:
- A. Upstream of a pump.
- B. In catalyst piping.
- C. Any superheated steam piping.
- D. Downstream of a gate valve.
Answer: B
NEW QUESTION 192
Which of the following is not a critical factor that contributes to a brittle fracture?
- A. The material's fracture toughness
- B. Stress concentration at a flaw
- C. Maximum operating temperature
- D. Magnitude of the residual stresses
Answer: C
NEW QUESTION 193
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