Question 488Steam Plants - Assistant Engineer

70% to pass

The most harmful slag forming compounds found in fuel oils are _______________.

Apotassium and nickel
Bvanadium and sodium
Ccalcium and silica
Diron and sulfur
AI Explanation

The correct answer is B) vanadium and sodium. Vanadium and sodium are the most harmful slag-forming compounds found in fuel oils. These compounds can form deposits on boiler and turbine components, leading to decreased efficiency and increased maintenance requirements. This is an important consideration for the operation and maintenance of vessels, which is a key part of the US Coast Guard Captain's License Examinations. The other options are incorrect because potassium and nickel (A) are not the primary slag-forming compounds, calcium and silica (C) are less problematic than vanadium and sodium, and iron and sulfur (D) do not directly contribute to slag formation in the same way as the correct answer.

Related Questions
Q@q.QuestionNumber:The entire unit which houses the burner, air scoop, air doors and bladed cone is... Q@q.QuestionNumber:Lower than normal steam pressure in an operating boiler may be caused by _______... Q@q.QuestionNumber:If there is a sudden drop in the outlet temperature of an uncontrolled superheat... Q@q.QuestionNumber:The most practical method of determining the condition of a shaft bearing while ... Q@q.QuestionNumber:The purpose of the main reduction gears is to _______________.

Ready to test your knowledge?

Take a Steam Plants - Assistant Engineer Practice Exam
Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
← Previous All Questions Next →

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

Get the App