API 571 EXAM QUESTIONS & ANSWERS
1. __________ is a change in the microstructure of certain carbon steels and
0.5 Mo steels after long term operation in the 800º F to 1100º F range.
A. Graphitization
B. Softening
C. Temper Embrittlement
D. Creep - Answer -Graphitization 571 4.2.1
2. What structure is 304 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - Answer -Austenitic Terms 3.1.2
3. _________ is the result of cyclic stress caused by variations in temperature.
A. Creep
B. Thermal Fatigue
C. Cyclic Cracking
D. Stress Corrosion Cracking - Answer -Thermal Fatigue 4.2.9
4. General or localized corrosion of carbon steels and other metals caused by dissolved
salts, gases, organic compounds or microbiological activities is called ________.
A. Flue Gas Corrosion
B. Atmospheric Corrosion
C. Cooling Water Corrosion
D. None of the Above
E. All of the Above - Answer -Cooling Water Corrosion 4.3.4
5. What structure is 410 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - Answer -Martensitic terms 3.1.12
6. The sudden rapid fracture under stress (residual or applied) where the material
exhibits little or no evidence of ductility or plastic deformation is called _________.
A. 885º F Embrittlement
B. Temper Embrittlement
C. Stress Corrosion Cracking
D. Brittle Fracture - Answer -Brittle Fracture 4.2.7
7. What structure is 409 stainless steel?
A. Martensitic
B. Austenitic
,C. Duplex
D. Ferritic - Answer -Ferritic stainless steel Term 3.1.7
8. Low alloy steels contain a maximum of _______ chrome.
A. 5%
B. 6%
C. 7.5%
D. 9% - Answer -9% Terms 3.1.11
9. Which of the following can be affected by 885º F Embrittlement?
A. 410 SS
B. 430 SS
C. 308 SS
D. Alloy 2205
E. A, B and D - Answer -410 ss, 430 ss, Alloy 2205 4.2.5.2
10. For 5Cr-0.5Mo, what is the threshold temperature for creep?
A. 500º F
B. 800º F
C. 600º F
D. 700º F - Answer -800 F Table 4-3 4.2.8.9
11. ________ has been a major problem on coke drum shells.
A. Thermal fatigue
B. Stress cracking
C. Erosion
D. Temper embrittlement - Answer -Thermal fatigue 4.2.9.4 (b)
12. Thermal fatigue cracks propagate ________ to the stress and are usually dagger
shaped, transgranular and oxide-filled.
A. Axial
B. Diagonal
C. Transverse
D. Angular - Answer -Transverse 4.2.9.5 (b)
13. Inspection for wet H2S damage generally focuses on _____ and ______.
A. Weld seams
B. Nozzles
C. Trays
D. Down comers
E. A and B - Answer -Weld seams and Nozzles 5.1.2.3.7 (b)
14. ________ is a form of erosion caused by the formation and instantaneous collapse
of innumerable tiny vapor bubbles.
A. Condensate corrosion
B. Cavitation
,C. Dew-Point corrosion
D. Atmospheric corrosion - Answer -Cavitation 4.2.15 (a)
15. With CUI, corrosion rates __________ with increasing metal temperatures up to the
point where the water evaporates quickly.
A. Decrease
B. Increase
C. Stay the same
D. None of the above - Answer -Increase 4.3.3.3 (b)
16. Which of the following metals is the most anodic?
A. Zinc
B. Carbon Steel
C. Nickel
D. Monel - Answer -Zinc 4.3.1.6 (e)
17. Cracking of dissimilar weld metals occurs on the _________ side of a weld between
an austenitic and a Ferritic material operating at high temperatures.
A. Austenitic
B. Ferritic
C. Anodic
D. Cathodic - Answer -Ferritic 4.2.12.1
18. Soil to Air interface areas are usually more susceptible to corrosion than the rest of
the structure because of ___________ and __________ availability.
A. Moisture
B. Bacteria
C. Oxygen
D. B and C
E. A and C - Answer -Moisture and Oxygen 4.3.9.3 (e)
19. Carburization can be confirmed by substantial increases in _______ and loss of
__________.
A. Hardness
B. Tensile Strength
C. Ductility
D. A and B
E. A and C - Answer -Hardness and Ductility 4.4.3.5 (b)
20. Liquid metal embrittlement can occur if 300 Series SS comes in contact with molten
_______.
A. Copper
B. Mercury
C. Zinc
D. Lead - Answer -Zinc 4.5.5.4 (b)
, 21. Cracks that are typically straight, non-branching, and devoid of any associated
plastic deformation are likely associated with which type of failure?
A. Stress corrosion cracking
B. Brittle fracture
C. Thermal fatigue
D. Temper embrittlement - Answer -Brittle Fracture 4.2.7.5 (a)
22. 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. Ductility
C. Softening
D. Hardening - Answer -Creep 4.2.8.1 (a)
23. Permanent deformation occurring at relatively low stress levels as a result of
localized overheating is called ________.
A. Stress cracking
B. Brittle fracture
C. Temper embrittlement
D. Stress rupture - Answer -Stress rupture 4.2.10.1
24. _____________ usually occurs when a colder liquid contacts a warmer metal
surface.
A. Brittle fracture
B. Thermal fatigue
C. Thermal shock
D. Stress rupture - Answer -Thermal shock 4.2.13.1
25. Nickel based alloys usually contain ________ nickel.
A. ≥30%
B. ≥20%
C. ≥10%
D. ≥12% - Answer -> 30% 3.1.16
26. _________ is a change in the microstructure of certain carbon steels and 0.5Mo
steels after long-term operation in the 800º F to 1100º F range that may cause a loss in
strength, ductility and/or creep resistance.
A. Embrittlement
B. Carburization
C. Graphitization
D. Sensitization - Answer -Graphitization 4.2.1
27. __________ 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.
1. __________ is a change in the microstructure of certain carbon steels and
0.5 Mo steels after long term operation in the 800º F to 1100º F range.
A. Graphitization
B. Softening
C. Temper Embrittlement
D. Creep - Answer -Graphitization 571 4.2.1
2. What structure is 304 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - Answer -Austenitic Terms 3.1.2
3. _________ is the result of cyclic stress caused by variations in temperature.
A. Creep
B. Thermal Fatigue
C. Cyclic Cracking
D. Stress Corrosion Cracking - Answer -Thermal Fatigue 4.2.9
4. General or localized corrosion of carbon steels and other metals caused by dissolved
salts, gases, organic compounds or microbiological activities is called ________.
A. Flue Gas Corrosion
B. Atmospheric Corrosion
C. Cooling Water Corrosion
D. None of the Above
E. All of the Above - Answer -Cooling Water Corrosion 4.3.4
5. What structure is 410 stainless steel?
A. Martensitic
B. Austenitic
C. Duplex
D. Ferritic - Answer -Martensitic terms 3.1.12
6. The sudden rapid fracture under stress (residual or applied) where the material
exhibits little or no evidence of ductility or plastic deformation is called _________.
A. 885º F Embrittlement
B. Temper Embrittlement
C. Stress Corrosion Cracking
D. Brittle Fracture - Answer -Brittle Fracture 4.2.7
7. What structure is 409 stainless steel?
A. Martensitic
B. Austenitic
,C. Duplex
D. Ferritic - Answer -Ferritic stainless steel Term 3.1.7
8. Low alloy steels contain a maximum of _______ chrome.
A. 5%
B. 6%
C. 7.5%
D. 9% - Answer -9% Terms 3.1.11
9. Which of the following can be affected by 885º F Embrittlement?
A. 410 SS
B. 430 SS
C. 308 SS
D. Alloy 2205
E. A, B and D - Answer -410 ss, 430 ss, Alloy 2205 4.2.5.2
10. For 5Cr-0.5Mo, what is the threshold temperature for creep?
A. 500º F
B. 800º F
C. 600º F
D. 700º F - Answer -800 F Table 4-3 4.2.8.9
11. ________ has been a major problem on coke drum shells.
A. Thermal fatigue
B. Stress cracking
C. Erosion
D. Temper embrittlement - Answer -Thermal fatigue 4.2.9.4 (b)
12. Thermal fatigue cracks propagate ________ to the stress and are usually dagger
shaped, transgranular and oxide-filled.
A. Axial
B. Diagonal
C. Transverse
D. Angular - Answer -Transverse 4.2.9.5 (b)
13. Inspection for wet H2S damage generally focuses on _____ and ______.
A. Weld seams
B. Nozzles
C. Trays
D. Down comers
E. A and B - Answer -Weld seams and Nozzles 5.1.2.3.7 (b)
14. ________ is a form of erosion caused by the formation and instantaneous collapse
of innumerable tiny vapor bubbles.
A. Condensate corrosion
B. Cavitation
,C. Dew-Point corrosion
D. Atmospheric corrosion - Answer -Cavitation 4.2.15 (a)
15. With CUI, corrosion rates __________ with increasing metal temperatures up to the
point where the water evaporates quickly.
A. Decrease
B. Increase
C. Stay the same
D. None of the above - Answer -Increase 4.3.3.3 (b)
16. Which of the following metals is the most anodic?
A. Zinc
B. Carbon Steel
C. Nickel
D. Monel - Answer -Zinc 4.3.1.6 (e)
17. Cracking of dissimilar weld metals occurs on the _________ side of a weld between
an austenitic and a Ferritic material operating at high temperatures.
A. Austenitic
B. Ferritic
C. Anodic
D. Cathodic - Answer -Ferritic 4.2.12.1
18. Soil to Air interface areas are usually more susceptible to corrosion than the rest of
the structure because of ___________ and __________ availability.
A. Moisture
B. Bacteria
C. Oxygen
D. B and C
E. A and C - Answer -Moisture and Oxygen 4.3.9.3 (e)
19. Carburization can be confirmed by substantial increases in _______ and loss of
__________.
A. Hardness
B. Tensile Strength
C. Ductility
D. A and B
E. A and C - Answer -Hardness and Ductility 4.4.3.5 (b)
20. Liquid metal embrittlement can occur if 300 Series SS comes in contact with molten
_______.
A. Copper
B. Mercury
C. Zinc
D. Lead - Answer -Zinc 4.5.5.4 (b)
, 21. Cracks that are typically straight, non-branching, and devoid of any associated
plastic deformation are likely associated with which type of failure?
A. Stress corrosion cracking
B. Brittle fracture
C. Thermal fatigue
D. Temper embrittlement - Answer -Brittle Fracture 4.2.7.5 (a)
22. 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. Ductility
C. Softening
D. Hardening - Answer -Creep 4.2.8.1 (a)
23. Permanent deformation occurring at relatively low stress levels as a result of
localized overheating is called ________.
A. Stress cracking
B. Brittle fracture
C. Temper embrittlement
D. Stress rupture - Answer -Stress rupture 4.2.10.1
24. _____________ usually occurs when a colder liquid contacts a warmer metal
surface.
A. Brittle fracture
B. Thermal fatigue
C. Thermal shock
D. Stress rupture - Answer -Thermal shock 4.2.13.1
25. Nickel based alloys usually contain ________ nickel.
A. ≥30%
B. ≥20%
C. ≥10%
D. ≥12% - Answer -> 30% 3.1.16
26. _________ is a change in the microstructure of certain carbon steels and 0.5Mo
steels after long-term operation in the 800º F to 1100º F range that may cause a loss in
strength, ductility and/or creep resistance.
A. Embrittlement
B. Carburization
C. Graphitization
D. Sensitization - Answer -Graphitization 4.2.1
27. __________ 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.
