Question 576Electricity & Electronics - Assistant Engineer

70% to pass

If the cooling water system is isolated for repairs, but it is still desirable to run the alternator pictured in figure "A" of the illustration, what must be done? Illustration EL-0037

Diagram for USCG Electrical Assistant: If the cooling water system is isolated for repairs, but it is still desirable...
AThe emergency air inlet panel and air outlet doors must remain closed, which requires the alternator to be run only at reduced loads.
BThe emergency air inlet panel and air outlet doors must be opened and only then can the alternator be run, but at reduced load.
CThe alternator may not be run without cooling water under any circumstances.
DThe emergency air inlet panel and air outlet doors must be opened, but in doing so allows the alternator to be run at rated load.
AI Explanation

The correct answer is B. When the cooling water system is isolated for repairs, the emergency air inlet panel and air outlet doors must be opened to allow for adequate cooling of the alternator. However, even with the air inlet and outlet doors open, the alternator should only be run at reduced load, as the lack of cooling water circulation can cause the alternator to overheat if operated at full rated load. The other options are incorrect: A is incorrect because the alternator cannot be run at full load without the air inlet and outlet doors being open. C is incorrect because the alternator can be run, but only at reduced load, with the air inlet and outlet doors open. D is incorrect because the alternator should not be run at rated load without the cooling water system in operation, even with the air inlet and outlet doors open.

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