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NEW QUESTION # 22
_______ is the primary alloying agent that affects resistance to oxidation.
- A. Molybdenum
- B. Silicon
- C. Chromium
- D. Aluminum
Answer: C
NEW QUESTION # 23
___________ is the result of cyclic stresses caused by variations in temperature.
- A. Stress cracking
- B. Thermal fatigue
- C. Cyclic cracking
- D. Stress fatigue
Answer: B
NEW QUESTION # 24
Carbonate stress corrosion cracking is the term applied to surface breaking or cracks that occur adjacent to carbon steel welds under the combined action of ____________ and ___________ in carbonate containing systems.
- A. Temperature, stress
- B. Corrosion, velocity
- C. Tensile stress, corrosion
- D. Tensile stress, velocity
Answer: C
NEW QUESTION # 25
With sulfuric acid corrosion, alloys such as Alloy 20 resist dilute acid corrosion and form a protective ________ film on the surface.
- A. Chloride
- B. Iron sulfate
- C. Iron oxide
- D. Sulfide
Answer: B
NEW QUESTION # 26
________ has been a major problem on coke drum shells.
- A. Temper embrittlement
- B. Stress cracking
- C. Thermal fatigue
- D. Erosion
Answer: C
NEW QUESTION # 27
What structure is 304 stainless steel?
- A. Ferritic
- B. Duplex
- C. Martensitic
- D. Austenitic
Answer: D
NEW QUESTION # 28
When carbon is absorbed into a material at elevated temperatures while in contact with a carbonaceous substance it is called carburization. Temperatures usually have to be above __________ for this to occur.
- A. 1200(o) F
- B. 1000(o) F
- C. 1400(o) F
- D. 1100(o) F
Answer: D
NEW QUESTION # 29
__________ are the most common type of equipment susceptible to carburization in the refining industry.
- A. Fin Fans
- B. Heat exchangers
- C. Heater tubes
- D. Reactors
Answer: C
NEW QUESTION # 30
Most brittle failures appear as:
- A. Intergranular cracking.
- B. Cleveage.
- C. Branched cracking.
- D. Ductile tears.
Answer: B
NEW QUESTION # 31
Susceptibility to temper embrittlement is largely determined by the presence of the alloying elements manganese and _______.
- A. Moly
- B. Silicon
- C. Chromium
- D. None of the above
Answer: B
NEW QUESTION # 32
In HF service, carbon steel operating above ________ should be closely monitored for loss in thickness and may need to be upgraded to Alloy 400.
- A. 150(o) F
- B. 160(o) F
- C. 200(o) F
- D. 175(o) F
Answer: A
NEW QUESTION # 33
With creep, increased stress due to loss in thickness from corrosion will ________ time to failure.
- A. Increase
- B. Reduce
- C. None of the above
- D. Not affect
Answer: B
NEW QUESTION # 34
Low creep ductility is _____ prevalent at the lower temperatures in the creep range. Or low stresses in the upper creep range.
- A. More
- B. Less
- C. Equally
- D. None of the above
Answer: A
NEW QUESTION # 35
Which of the following materials is not susceptible to high temperature hydrogen attack?
- A. 300 Series SS
- B. 5 Cr-1Mo
- C. All of the above
- D. 9Cr-1Mo
Answer: C
NEW QUESTION # 36
Thermal fatigue cracks usually initiate on the _________ of the component. They are generally wide and filled with oxides due to the elevated temperatures.
- A. ID
- B. Welds
- C. Surface
- D. None of the above
Answer: C
NEW QUESTION # 37
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. Cathodic corrosion
- C. All of the above
- D. Anodic corrosion
Answer: A
NEW QUESTION # 38
The presence of ________ in H²S streams increases the severity of high temperature sulfide corrosion at temperatures above about 500º F
- A. Sulfides
- B. Amine
- C. All of the above
- D. Hydrogen
Answer: D
NEW QUESTION # 39
What is the chemical symbol for propane or propylene?
- A. C4
- B. CH4
- C. C2
- D. C3
Answer: D
NEW QUESTION # 40
The dewpoint of hydrochloric acid depends on the concentration of hydrogen chloride. It is typically about
_________.
- A. 180º F
- B. 130º F
- C. 160º F
- D. 110º F
Answer: B
NEW QUESTION # 41
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