Chief Engineer-MODU Practice Questions - USCG Chief Engineer - Mobile Offshore Drilling Unit (MODU) Exam

Crankcase explosion relief valves on a large diesel are designed to:

Vent continuously so the crankcase is held under vacuum in normal running Relieve the pressure rise of a primary explosion and then reseat quickly so fresh air is not drawn back in Admit outside air to cool an overheating bearing Return crankcase oil to the sump tank when the level runs high

Correct Answer:

Relieve the pressure rise of a primary explosion and then reseat quickly so fresh air is not drawn back in

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