API 571 Practice Exam #1 Questions
and Answers (Latest Update 2026)
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% -
correct 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 -
correct 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
,API 571 Practice Exam #1 Questions
and Answers (Latest Update 2026)
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 -
correct answer ✅A
5.1.3.2.3 c)
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 -
correct answer ✅A
4.3.4.3 k)
,API 571 Practice Exam #1 Questions
and Answers (Latest Update 2026)
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
d) all ofthe a bove -
correct answer ✅A
4.5.2.1
What could ammonium bisulfide corrosion also be called?
a) fuel ash corrosion
b) alkaline fuel ash corrosion
c) alkaline sour water corrosion
d) amine wa ter corrosion -
correct answer ✅C
5.1.1.2
Typical HF alkylation units operate with 1% to 3% water in the acid,
equivalent t o an HF-inwater concentration of 97% to 99% and the
, API 571 Practice Exam #1 Questions
and Answers (Latest Update 2026)
temperatures are gener ally below 150°F (66°C). Under these
conditions wh at material is widely used for all equipment except
where close
tolerances are required for operation (i.e., pumps, valves,
instruments)?
a) carbon steel
b) 300 series stainless steels
c) duplex stainless steels
d) nickel alloys -
correct answer ✅A
5.1.1.6.3 e)
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
and Answers (Latest Update 2026)
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% -
correct 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 -
correct 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
,API 571 Practice Exam #1 Questions
and Answers (Latest Update 2026)
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 -
correct answer ✅A
5.1.3.2.3 c)
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 -
correct answer ✅A
4.3.4.3 k)
,API 571 Practice Exam #1 Questions
and Answers (Latest Update 2026)
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
d) all ofthe a bove -
correct answer ✅A
4.5.2.1
What could ammonium bisulfide corrosion also be called?
a) fuel ash corrosion
b) alkaline fuel ash corrosion
c) alkaline sour water corrosion
d) amine wa ter corrosion -
correct answer ✅C
5.1.1.2
Typical HF alkylation units operate with 1% to 3% water in the acid,
equivalent t o an HF-inwater concentration of 97% to 99% and the
, API 571 Practice Exam #1 Questions
and Answers (Latest Update 2026)
temperatures are gener ally below 150°F (66°C). Under these
conditions wh at material is widely used for all equipment except
where close
tolerances are required for operation (i.e., pumps, valves,
instruments)?
a) carbon steel
b) 300 series stainless steels
c) duplex stainless steels
d) nickel alloys -
correct answer ✅A
5.1.1.6.3 e)
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
