Question 2517 Deck Safety

70% to pass

The period of roll is the time difference between _______________.

A zero inclination to full inclination on one side
B zero inclination to the next zero inclination
C full inclination on one side to full inclination on the other side
D full inclination on one side to the next full inclination on the same side
AI Explanation

The correct answer is D) full inclination on one side to the next full inclination on the same side. The period of roll refers to the time it takes for a vessel to complete one full cycle of rolling from one side to the other and back again. This is measured from the point of maximum inclination on one side to the point of maximum inclination on the same side in the next cycle. The other options are incorrect because they do not accurately describe the full cycle of the roll period. Option A measures only half the cycle, option B includes the time between two zero inclination points which does not capture the full roll, and option C measures the time between full inclinations on opposite sides which is not the definition of period of roll.

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46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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