PAC 3 Practice Test Questions & Answers with 100% Correct Answers | Verified & Updated 2024 | Guaranteed Success

PAC 3 Practice Test Questions & Answers with 100% Correct Answers | Verified & Updated 2024 | Guaranteed Success In heat exchangers, which metallurgy is most prone to form waterside scale deposits? a. stainless steel b. admiralty c. mild steel d. copper - c. mild steel The localized (pitting) corrosion rate increases when: a. the cathodic area and anodic area are similar anodic area is large relitive to the cathode c. the cathodic area is large relative to the anode d. when sacrificial anodes are used - c. the cathodic area is large relative to the anode Deposits usually lead to aggravated localized corrosion because: a. decreased pH levels at the cathode b. a galvanic cell is set up between the manganese deposit and the metal c. deficient oxygen levels under the deposit d. increased pH levels at the anode e. both a and b - c. deficient oxygen levels under the deposit white rust is: a. calcium carbonate bleached by excessive chloronation b. porous zinc carbonates or zinc hydroxide corrosion product c. caused by high calcium hardness levels d. aluminum and iron corrosion product - b. porous zinc carbonates or zinc hydroxide corrosion product