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NRG Exam Questions & Answers 2024
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NRG Exam Questions & Answers 2024
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NRG Exam Questions & Answers 2024In heat exchangers, what metallurgy is most prone to waterside scale deposits - ANSWER-Mild Steel
Localized corrosion rate increases when - ANSWER-large cathode, small cathode
Deposits usually lead to aggravated localized corrosion because - ANSWER-deficient oxygen levels under
deposit
How to prevent white-rust - ANSWER-Keep calcium hardness below 50ppm
What happens when chlorination is used on a system with soluble iron/maanganese - ANSWER-
Oxidation of ions, precipitate out
MU 100gpm, 150 m-alk. To maintain 400ppm m-alk in recirc water. How much 98% H2SO4 is needed? -
ANSWER-8.4 lbs/day
What is a characteristic of corrosion caused by anaerobic bacteria? - ANSWER-Granules of black iron
(iron sulfide)
What is a C factor for heat exchangers? - ANSWER-Water flow and pressure drop
T/F: Bio-Index is independent of Bio-Reporter concentration - ANSWER-False
What is Nal Scale Index - ANSWER-Measures rate of polymer consumption
Primary cause of pump failure in cooling water systems? - ANSWER-Particulate corrosion
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