API 571 Practice Exam #1 Questions With Accurate Guaranteed Answers Pass At First Attempt

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 answers 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 answers 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 - correct answers 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 answers 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 d) all ofthe a bove - correct answers 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 answers 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 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 answers 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 d) nickel alloys - correct answers 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 - correct answers 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 - correct answers 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 - correct answers 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. - correct answers 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 - correct answers D Table 4-6 Visual examination of suspected n areas is only one means of inspect ion , others include: a) UT or RT to detect the extent of metal loss b) corrosion coupons and on-line corrosion monitoring electrical resistance probes c) IR scans to detect refractory loss on stream d) all of the above - correct answers D 4.2.14.7 a) b) c) Naphthenic acid corrosion is suspected on a high velocity outlet line of a crude oil heater. What is the best method for inspecting for damage? a) spot UT thickness measurements b) RT followed by UT thickness measurement c) RT should be the primary detection method d) thermography - correct answers B 5.1.1.7.7 a) Inspecting for vibration-induced fatigue may include: a) looking for visible signs of vibration, pipe movement or water hammer b) checking for the audible sounds of vibration emanating from piping components such as control valves and fittings c) conducting visual inspection during transient conditions (such as startups, shutdowns, upsets, etc.) for intermittent vibrating conditions d) all of the above - correct answers D 4.2.17.7 Dissimilar metal welds with a 300 Series SS weld metal on a ferritic steel may result in: a) a narrow region of high hardness at the toe of the weld, near the fusion line on the ferritic steel side b) high hardness zones that render the material susceptible to various forms of environmental cracking such as sulfide stress cracking or hydrogen stress cracking c) high hardness zones that render the material susceptible to various forms of fatigue cracking, particularly hydrogen sulfide service d) a and b - correct answers D 4.2.12.3 g) Hot refractory lined piping can be inspected and monitored by using: a) Hot-wall equipment on-stream using IR to monitor b) Cold-wall equipment on-stream using IR to monitor c) Visual examination during operation d) LP during shutdowns - correct answers B 4.2.18.7 b) Which material has the most resistance to NAC in the following list? a) 316 SS b) 317 ss c) Alloy 625 d) 6% Mo Alloys - correct answers C Table 5-2