Exam Question
Write short notes on
(a) Free surface effect (4)
(b) Cavitation (4)
(c) Reserve buoyancy (4)
(d) Margin line (4)
Class 4 (4th Engineer)
SC&S
📅 Aug 2023
Reference Answer
### (a) Free Surface Effect (FSE)
**1. Definition:**
Free Surface Effect is the virtual loss of stability (reduction in metacentric height, GM) experienced by a vessel due to the movement of liquid in partially filled (slack) tanks or compartments. When the vessel heels, the liquid flows to the lower side, causing a shift in the vessel's overall center of gravity, which reduces the righting lever (GZ).
**2. Mechanism:**
**1. Definition:**
Free Surface Effect is the virtual loss of stability (reduction in metacentric height, GM) experienced by a vessel due to the movement of liquid in partially filled (slack) tanks or compartments. When the vessel heels, the liquid flows to the lower side, causing a shift in the vessel's overall center of gravity, which reduces the righting lever (GZ).
**2. Mechanism:**
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play