Question 533General Subjects - Assistant Engineer

70% to pass

As it pertains to the automatic hoist winch brake of an electro-hydraulic cargo- handling pedestal-type deck crane, what statement is true?

AThe brake is hydraulically set and spring released, and the brake automatically releases when the hoist pump is brought to zero stroke or there is a loss of servo power hydraulic pressure.
BThe brake is spring set and hydraulically released, and the brake automatically sets when the hoist pump is brought to zero stroke or there is a loss of servo power hydraulic pressure.
CThe brake is hydraulically set and spring released, and the brake automatically sets when the hoist pump is brought to zero stroke or there is a loss of servo power hydraulic pressure.
DThe brake is spring set and hydraulically released, and the brake automatically releases when the hoist pump is brought to zero stroke or there is a loss of servo power hydraulic pressure.
AI Explanation

The correct answer is B. The brake in an electro-hydraulic cargo-handling pedestal-type deck crane is spring set and hydraulically released. This means that the brake is normally engaged, and hydraulic pressure is required to release it. When the hoist pump is brought to zero stroke or there is a loss of servo power hydraulic pressure, the brake automatically sets to prevent the load from falling. The other options are incorrect because they describe the opposite brake configuration (hydraulically set and spring released), or the incorrect automatic brake behavior (automatically releasing instead of setting) when the hoist pump or hydraulic pressure is lost.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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