API 571 PRACTICE EXAM 1 QUESTIONS & ANSWERS
At what oxygen content would many metals become flammable even at low pressures,
whereas they are non-flammable in air?
a) >10%
b) >25%
c) 20-40%
d) >40% - Answer -B
4.2.20.1
What area of a heater burning fuel oil with numerous impurities would first suffer
damage from fuel ash corrosion.
a) shock tubes
b) radian tubes
c) tube hangers and supports
d) convection tubes - Answer -C
4.4.6.4 c)
Hydriding of titanium is a metallurgical phenomenon in which hydrogen diffuses into the
titanium and reacts to form an embrittling hydride phase. This can result in a complete
loss of ductility with no noticeable sign of corrosion or loss in thickness. Galvanic
contact between titanium and more active materials such as carbon steel can have what
affect?
a) promotes damage
b) insulates the galvanic system and decreases damage
c) insulates the galvanic system and decreases damage only if pure titanium is used
(not titanium alloys)
d) all of the above - Answer -A
5.1.3.2.3 c)
Amine corrosion refers to the gener al and/or localized corrosion th at occurs principally
on carbon steel in amine treating processes. Corrosion is not cau sed by the amine
itself, but results from dissolved acid gases (COz and HzS), amine degr adation
products, heat stable amine salts and other contaminants. Amine corrosion primarily
occurs in which materials?
a) carbon steel
b) 300 series st ainless steels
c) ferritic stainless st eels
d) nickel alloys - Answer -A
5.1.1.1.2
What is the most important factor related to mechanical fatigue of a piece of equipment?
a) material selection
b) equipment design
c) operating conditions
, d) opera ting temper atures - Answer -B
4.2.16.3
Temper embrittlement primarily occurs in:
a) Some low alloy steels as a result oflong term exposure from 650oF to 1070oF
b) All carbon and alloy steels as a result of long term exposure from 650oF to 1070oF
c) All cast irons and all carbon steels above 800°F
d) 2.25Cr-1Mo steels at 900oF - Answer -D
4.2.3.2 a)
Cracking of a metal due to stress relaxation during PWHT or in service at elevated
temperatures is most often observed in heavy wall sections. This is called:
a) stress relieving corrosion cr acking
b) reheat cracking
c) hydrogen induced stress relieving cracking
d) SOHIC - Answer -B
4.2.8.2
Creep can occur in:
a) All metals and alloys.
b) Only ferrous metals.
c) Only in weldments of all metals and alloys.
d) All carbon steels. - Answer -A
4.2.8.2
Which combination of joined metals is most likely to corrode in an aggressive
environment when a suitable electrolyte is present?
a) steel-zinc
b) steel-magnesium
c) steel-aluminum
d) titanium-zinc - Answer -D
Table 4-6
When connected to a more anodic material in cooling water:
a) titanium may suffer severe hydriding embrittlement
b) titanium may suffer severe hydriding embrittlement below 180°F (82°C)
c) titanium becomes immune to corrosion
d) titanium becomes almost immune to corrosion - Answer -A
4.3.4.3 k)
What form of fatigue cracking develops under the combined effects of cyclic loading and
corrosion and are evidenced by ver little plastic deformation where the final fracture may
occur by mechanical overload accompanied by plaslic deformation?
a ) corrosion fatigue
b) mechanical (vibration) fatigue
c) thermal fatigue
At what oxygen content would many metals become flammable even at low pressures,
whereas they are non-flammable in air?
a) >10%
b) >25%
c) 20-40%
d) >40% - Answer -B
4.2.20.1
What area of a heater burning fuel oil with numerous impurities would first suffer
damage from fuel ash corrosion.
a) shock tubes
b) radian tubes
c) tube hangers and supports
d) convection tubes - Answer -C
4.4.6.4 c)
Hydriding of titanium is a metallurgical phenomenon in which hydrogen diffuses into the
titanium and reacts to form an embrittling hydride phase. This can result in a complete
loss of ductility with no noticeable sign of corrosion or loss in thickness. Galvanic
contact between titanium and more active materials such as carbon steel can have what
affect?
a) promotes damage
b) insulates the galvanic system and decreases damage
c) insulates the galvanic system and decreases damage only if pure titanium is used
(not titanium alloys)
d) all of the above - Answer -A
5.1.3.2.3 c)
Amine corrosion refers to the gener al and/or localized corrosion th at occurs principally
on carbon steel in amine treating processes. Corrosion is not cau sed by the amine
itself, but results from dissolved acid gases (COz and HzS), amine degr adation
products, heat stable amine salts and other contaminants. Amine corrosion primarily
occurs in which materials?
a) carbon steel
b) 300 series st ainless steels
c) ferritic stainless st eels
d) nickel alloys - Answer -A
5.1.1.1.2
What is the most important factor related to mechanical fatigue of a piece of equipment?
a) material selection
b) equipment design
c) operating conditions
, d) opera ting temper atures - Answer -B
4.2.16.3
Temper embrittlement primarily occurs in:
a) Some low alloy steels as a result oflong term exposure from 650oF to 1070oF
b) All carbon and alloy steels as a result of long term exposure from 650oF to 1070oF
c) All cast irons and all carbon steels above 800°F
d) 2.25Cr-1Mo steels at 900oF - Answer -D
4.2.3.2 a)
Cracking of a metal due to stress relaxation during PWHT or in service at elevated
temperatures is most often observed in heavy wall sections. This is called:
a) stress relieving corrosion cr acking
b) reheat cracking
c) hydrogen induced stress relieving cracking
d) SOHIC - Answer -B
4.2.8.2
Creep can occur in:
a) All metals and alloys.
b) Only ferrous metals.
c) Only in weldments of all metals and alloys.
d) All carbon steels. - Answer -A
4.2.8.2
Which combination of joined metals is most likely to corrode in an aggressive
environment when a suitable electrolyte is present?
a) steel-zinc
b) steel-magnesium
c) steel-aluminum
d) titanium-zinc - Answer -D
Table 4-6
When connected to a more anodic material in cooling water:
a) titanium may suffer severe hydriding embrittlement
b) titanium may suffer severe hydriding embrittlement below 180°F (82°C)
c) titanium becomes immune to corrosion
d) titanium becomes almost immune to corrosion - Answer -A
4.3.4.3 k)
What form of fatigue cracking develops under the combined effects of cyclic loading and
corrosion and are evidenced by ver little plastic deformation where the final fracture may
occur by mechanical overload accompanied by plaslic deformation?
a ) corrosion fatigue
b) mechanical (vibration) fatigue
c) thermal fatigue
