In a closed, re-circulating fresh water...

Question 1 of 2707066636eef28f7522a1c51f844

In a closed, re-circulating fresh water cooling system used for the main engines on your vessel, what function would chemical treatment with molybdate primarily perform?

Back

Question 1 of 27070

In a closed, re-circulating fresh water cooling system used for the main engines on your vessel, what function would chemical treatment with molybdate primarily perform?

🔍 Key Concepts

• Closed fresh water cooling systems on main engines and why they use chemical treatment • The primary industrial use of molybdate compounds in water systems (e.g., boilers, cooling systems) • Difference between corrosion control, scale control, and biological control in cooling water

💭 Think About

• Think about what problem is most critical inside steel engine jackets and cooling passages when using fresh water over long periods. • Ask yourself: is molybdate more commonly associated with changing physical properties of water (like freezing/boiling) or with protecting metal surfaces? • Consider what other chemicals (like glycol or biocides) are usually used for the functions listed and compare them to molybdate.

✅ Before You Answer

• Identify which options (A–D) relate to changing physical properties of the water versus protecting metal surfaces or controlling organisms. • Recall that many corrosion inhibitors work by forming a protective film or passivating the metal surface—decide which option best matches that role. • Verify from your engineering studies which treatment chemicals are typically described as corrosion inhibitors versus antifreeze agents or biocides.