Class 4 (4th Engineer) SC&S 📅 Jun 2023

Exam Question

(a) Explain various powers and efficiencies in the Propulsion plant of a ship. (6)

(b) A vessel with a displacement of 12250 t burns 290 t of fuel while travelling at a speed of 15 knots on a voyage of 2850 nautical miles. On a voyage of 1800 nautical miles at a speed of 13 knots and a displacement of 14200t, estimate the quantity of fuel that will be burnt. (10)

Reference Answer

### (a) Powers and Efficiencies in a Ship's Propulsion Plant
The propulsion plant of a ship involves a sequence of power transmission from the engine to the water, with losses occurring at each stage. Understanding these powers and their associated efficiencies is critical for performance analysis and economic operation.
**1. Indicated Power (IP):**
This is the theoretical power developed within the engine cylinders by the combustion gases acting on the pistons. It is determined from an engine indicator diagram, which plots pressure versus volume inside the cylinder.

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