Question 3215 Deck General

70% to pass

For H2S detection, sensitized tapes indicate H2S presence by means of discoloration of an exposed spot on the tape. The shade of the color on the spot depends upon the concentration of H2S and which of the following factors?

A duration of the exposure
B humidity at the time of exposure
C air pressure at the time of the exposure
D air temperature at the time of the exposure
AI Explanation

The correct answer is A) duration of the exposure. The discoloration of the sensitized tape used for H2S detection depends on the concentration of H2S and the duration of the exposure. The longer the tape is exposed to H2S, the more intense the color change will be, indicating a higher concentration. The other factors, such as humidity, air pressure, and temperature, do not directly affect the color change of the tape, which is why they are incorrect answers.

Related Questions
Q@q.QuestionNumber:How many fathoms are in a shot of anchor cable? Q@q.QuestionNumber:To determine the number of inflatable liferafts required on a vessel, you should... Q@q.QuestionNumber:How should you signal the crane operator to raise the boom and lower the load? ... Q@q.QuestionNumber:When do the towing vessel fire protection regulations allow a towing vessel to c... Q@q.QuestionNumber:The locker or space containing the self-contained breathing apparatus must be _...

Ready to test your knowledge?

Take a Deck General Practice Exam
Official Resources
USCG Navigation Center USCG National Maritime Center Merchant Mariner Credentials
← Previous Question All Questions Next Question →

Want to practice with timed exams?

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

Get the App