DWO Ship Operations and Maintenance 2 — Questions and Answers
Question 1: When ballasting a vessel to correct a list, which tank should be filled first?
- The tank on the high side (Correct answer)
- The tank on the low side
- The double-bottom centerline tank
- Any tank with the largest capacity
Correct answer: The tank on the high side
Filling the tank on the high side counteracts the list by adding weight to the lighter side.
Question 2: What is the primary purpose of a vessel's bilge system?
- To supply cooling water to machinery
- To remove accumulated water from the lowest part of the ship (Correct answer)
- To transfer ballast water between tanks
- To supply fire-fighting water on deck
Correct answer: To remove accumulated water from the lowest part of the ship
The bilge system collects and pumps out water that accumulates in the bilges to maintain a dry, safe machinery space.
Question 3: Which factor most directly affects a vessel's metacentric height (GM)?
- The speed of the vessel
- The distribution of weight aboard (Correct answer)
- The vessel's length-to-beam ratio
- The ambient water temperature
Correct answer: The distribution of weight aboard
GM is directly affected by the vertical distribution of weight; lowering heavy weights decreases the center of gravity and increases GM.
Question 4: A vessel's freeboard is measured from the waterline to which point?
- The top of the bulwark
- The upper edge of the load line disc
- The upper surface of the freeboard deck at the vessel's side (Correct answer)
- The bridge deck
Correct answer: The upper surface of the freeboard deck at the vessel's side
Freeboard is the vertical distance from the waterline to the upper surface of the freeboard deck at the ship's side amidships.
Question 5: What action should be taken if the fresh water daily consumption exceeds the planned rate during a voyage?
- Switch entirely to distilled water production
- Implement water rationing and investigate the cause (Correct answer)
- Divert to the nearest port immediately
- Discharge ballast water for additional reserve
Correct answer: Implement water rationing and investigate the cause
Rationing conserves the remaining supply while investigating leaks, equipment failures, or excessive usage that caused the overrun.
Question 6: Which document lists all the equipment and quantities needed to complete a voyage?
- Certificate of Registry
- Stability booklet
- Stores and provisions manifest (Correct answer)
- Cargo plan
Correct answer: Stores and provisions manifest
The stores and provisions manifest itemizes all consumables—food, fuel, water, spare parts—required for the intended voyage.
Question 7: During port operations, who is responsible for ensuring the vessel's moorings are appropriate for the expected tidal range and weather?
- The port captain exclusively
- The pilot on board
- The officer of the watch (Correct answer)
- The chief engineer
Correct answer: The officer of the watch
The officer of the watch maintains responsibility for the safe mooring of the vessel, including adjusting lines for tidal and weather changes.
DWO Ship Operations and Maintenance 2
When ballasting a vessel to correct a list, which tank should be filled first?