Exam Question
Explain the meaning and purpose of EACH of the following terms:
(a) Duct keel (4)
(b) Margin line (4)
(c) Sheer (4)
(d) Round of Bilge (4)
Class 4 (4th Engineer)
SC&S
📅 Aug 2025
Reference Answer
### (a) Duct Keel
**Meaning:**
A duct keel is a watertight, longitudinally continuous passage or tunnel constructed along the centerline of a ship's double bottom structure. It typically extends for a significant portion of the ship's length, usually from the forward engine room bulkhead to the collision bulkhead, or even further.
**Purpose:**
**Meaning:**
A duct keel is a watertight, longitudinally continuous passage or tunnel constructed along the centerline of a ship's double bottom structure. It typically extends for a significant portion of the ship's length, usually from the forward engine room bulkhead to the collision bulkhead, or even further.
**Purpose:**
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