Question 654 Deck Safety

70% to pass

The "flammable limits" of an atmosphere are the _______________.

A upper and lower percentage of vapor concentrations in an atmosphere which will burn if an ignition source is present
B upper and lower pressures between which an atmosphere will not burn
C two temperatures between which an atmosphere will self ignite
D two temperatures between which an atmosphere will burn if an ignition source is present
AI Explanation

The correct answer is A) the upper and lower percentage of vapor concentrations in an atmosphere which will burn if an ignition source is present. The flammable limits, also known as the explosive limits, refer to the range of concentrations of a flammable vapor or gas in an atmosphere that will ignite or explode if an ignition source is present. This is a key safety concept for the US Coast Guard Captain's License Examinations, as it helps determine the risk of fire or explosion in various maritime environments. The other answer choices are incorrect because they do not accurately describe the flammable limits. Choices B, C, and D refer to pressure or temperature ranges, which are not the defining characteristics of flammable limits.

Related Questions
Q@q.QuestionNumber:Your vessel has a metacentric height of 1.12 feet and a beam of 60 feet. What wi... Q@q.QuestionNumber:The tricing pendants should be released _______________. Q@q.QuestionNumber:What is the average range of vessel-to-vessel VHF-FM radio communications? ... Q@q.QuestionNumber:The Coordinator Surface Search in a SAR situation should display by day ________... Q@q.QuestionNumber:The exhaust pipe must be gas tight throughout its entire length otherwise ______...

Ready to test your knowledge?

Take a Deck Safety Practice Exam
Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
← Previous All Questions Next →

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience with progress tracking.

Get the App