Updated Oct 09, 2025 Certification Exam API-571 Dumps – Practice Test Questions [Q42-Q65]

NO.42 With sulfuric acid corrosion, the presence of oxidizers can _______ the corrosion rate.

NO.43 Corrosion rates of carbon steel pipe in sulfuric acid service increase significantly:

NO.44 Permanent deformation occurring at relatively low stress levels as a result of localized overheating is called
________.

NO.45 A form of mechanical fatigue in which cracks are produced as a result of dynamic loadings is _______.

NO.46 Besides corrosion, what other damage mechanism in hydrofluoric (HF) acid service should inspectors be alert to?

NO.47 ________ significantly increases the probability and severity of blistering, HIC and SOHIC damage.

NO.48 Cracking of dissimilar weld metals occurs in the __________ side of a weld joining 300 Series SS and carbon steel.

NO.49 Amine corrosion depends on the design, operating practices, the type of amine, amine concentration, temperature and _________.

NO.50 Hydrogen stress cracking is normally found in:

NO.51 Corrosion rates of the anode can be high if there is a _______ anode to cathode ratio.

NO.52 The extent and depth of decarburization is a function of temperature and ______.

NO.53 Stainless steels have higher coefficients of thermal expansion than carbon steel or low alloy steel or nickel based alloys and are more likely to see _________.

NO.54 For a specific material, HTHA is dependent on temperature, hydrogen partial pressure, time and _________.

NO.55 Cooling water corrosion is a concern with water-cooled __________ and cooling towers in all applications across all industries.

NO.56 What treatment is used to prevent boiler feed water corrosion?

NO.57 The endurance limit is usually about:

NO.58 What method is most used to assure boiler feed water corrosion is not occurring?

NO.59 Non-stressed relieved __________ is susceptible to stress corrosion cracking when in contact with moist HF vapors in the presence of oxygen.

NO.60 Sulfidation usually creates:

NO.61 For 5Cr-0.5Mo, what is the threshold temperature for creep?

NO.62 Sour water corrosion in _________ containing environments may be accompanied by carbonate SCC.

NO.63 Caustic embrittlement cracking can be effectively prevented by means of PWHT at a temperature of _______.

NO.64 Erosion-corrosion is a description for the damage that occurs when corrosion contributes to erosion by removing protective films or scales, or by exposing the metal surface to further ________ under the combined action of corrosion-erosion.

NO.65 ________ has been a major problem on coke drum shells.