Question 739 Deck Safety

70% to pass

When using the oxygen indicator, which reaction from the needle should you expect as a sample is drawn into the instrument?

A Move back and forth and finally stabilize at the correct reading after about 10 seconds
B Rise to the correct reading and then, slowly fall to zero as the oxygen in the sample is consumed
C Slowly rise to the correct reading and then remain stationary
D Rise to the correct reading immediately and then rise slowly to a false reading as the operating temperature increases
AI Explanation

The correct answer is A) Move back and forth and finally stabilize at the correct reading after about 10 seconds. When using an oxygen indicator, the needle is expected to move back and forth initially as the sample is drawn into the instrument. This is because the oxygen indicator needs a short period of time, typically around 10 seconds, to stabilize and provide the correct reading. The needle will not immediately jump to the correct reading, as it needs to adjust to the oxygen concentration in the sample. The other options are incorrect because they do not accurately describe the expected reaction of the needle during this process.

Related Questions
Q@q.QuestionNumber:To rigidly fasten together the peak frames, the stem, and the outside framing, a... Q@q.QuestionNumber:In illustration D041DG below, which is the symbol for the vertical plane midway ... Q@q.QuestionNumber:What would be the result of physical exertion on the part of a person who has fa... Q@q.QuestionNumber:What is the lifesaving signal used to indicate, "Landing here is highly dangerou... Q@q.QuestionNumber:An emergency sea anchor may be constructed by using _______________.

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