API-571 : Corrosion and Materials Professional Exam

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API
API-571
Corrosion and Materials Professional
https://killexams.com/pass4sure/exam-detail/API-571
Question: 285
With steam blanketing, failure occurs as a result of _________ in the tube from the internal steam pressure at the
elevated temperature.
A . Stress risers
B . Velocity
C . Hoop stress
D . Tensile strength
Answer: C
Question: 286
Carbon dioxide corrosion results when COČ dissolves in water to form _________ acid.
A . Sulfuric
B . Hydrochloric
C . Carbonic
D . None of the above
Answer: C
Question: 287
Protection in a boiler from boiler feed water corrosion is accomplished by:
A . Injecting chlorines to kill microbiological bugs.
B . Injecting caustic to lower the ph to < 4.0.
C . Lowering solids content in boiler feed water to less than 50 ppm.
D . Maintaining a protective corrosion layer of magnetite (Fe3O4).
Answer: D
Question: 288
Susceptibility to hydrogen stress cracking __________ with __________ hardness.
A . Increases, increasing
B . Decreases, increasing
C . Decreases, Decreasing
D . Both A and C
Answer: D
Question: 289
With sour water corrosion, corrosion increases with __________ NH4HS concentration and __________ velocity.
A . Increasing, Decreasing
B . Increasing, Increasing
C . Decreasing, Decreasing
D . Decreasing, Increasing
Answer: B
Question: 290
_________ is the main concern during start-up, shutdown and/or hydro testing for equipment/piping operating at
elevated temperatures. This event can also occur in an auto refrigeration event in units processing light hydrocarbons.
A . Stress fracture
B . Carburization
C . Spheroidization
D . Brittle fracture
Answer: D
Question: 291
With creep, increased stress due to loss in thickness from corrosion will ________ time to failure.
A . Increase
B . Reduce
C . Not affect
D . None of the above
Answer: B
Question: 292
With hydrofluoric acid corrosion, corrosion rates increase with _______ temperatures and ______ HF concentrations.
A . Increasing, decreasing
B . Decreasing, increasing
C . Increasing, increasing
D . Decreasing, decreasing
Answer: A
Question: 293
To prevent hydrogen embrittlement, use lower strength steels and _________ to temper the microstructure, improve
ductility and reduce residual stresses.
A . Alloys
B . Preheat
C . PWHT
D . All of the above
Answer: C
Question: 294
The level of creep damage is a function of the material and the coincident _________ level at which the creep
deformation occurs.
A . Pressure/Temperature
B . Pressure/Stress
C . Temperature/Stress
D . None of the above
Answer: C
Question: 295
A form of corrosion that can occur at the junction of dissimilar metals when they are joined together in a suitable
electrolyte is __________.
A . Galvanic corrosion
B . Anodic corrosion
C . Cathodic corrosion
D . All of the above
Answer: A
Question: 296
The primary factors affecting high temperature oxidation are metal temperature and _______.
A . Pressure
B . Alloy composition
C . Stress
D . Oxygen
Answer: B
Question: 297
Sulfuric acid promotes general and localized corrosion of carbon steel. Carbon steel heat affected zones may
experience severe corrosion. Acid concentration, temperature, alloy content and ____________ are critical factors
affecting sulfuric acid corrosion.
A . Pressure
B . Stress
C . Velocity
D . Ductility
Answer: C
Question: 298
Which of the following materials is affected by high temperature corrosion?
A . Carbon steel
B . 300 Series SS
C . 400 Series SS
D . All of the above
Answer: D
Question: 299
Many thermal fatigue cracks are filled with:
A . chlorides.
B . hydroslime.
C . oxides.
D . sulfides.
Answer: C
Question: 300
Ammonium chloride corrosion is the general or localized corrosion, often pitting, normally occurring under ammonium
chloride or amine salt deposits. All commonly used materials are susceptible to ammonium chloride corrosion. A small
amount of _________ can lead to very aggressive corrosion.
A . Ammonium chloride
B . Amine
C . Water
D . Salt
Answer: C

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