USCG USCG General Eng
Set 3 • Question #307 of 498
Launch Interactive Practice Room Closed impellers differ from open impellers in that closed impellers __________.
A
allow liquid to enter the eye from one direction only
B
have side walls which extend from the eye to the outer edge of the vane tips
✓ Correct Answer
C
have small impeller eyes
D
are not vented above the impeller eye
USCG NMC Regulatory Explanation
In USCG Marine Engineering General Subjects, for engine room systems involving 'Closed impellers differ from open impellers in that closed impellers', the standard operating requirement is: 'have side walls which extend from the eye to the outer edge of the vane tips'.
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