7
What is the purpose of gear box in the engine room of fishing vessels
EXPLANATION
Selective & Eco-Friendly Fishing Gears
- Marine Gearbox in Fishing Vessels:
- In a fishing vessel propulsion train, the marine reduction-reverse gearbox is installed between the main diesel engine and the propeller shaft.
- Primary Purpose:
- Directional Control: Engages multi-plate clutches to allow forward, reverse, and neutral propeller shaft rotation while the engine runs continuously in one direction.
- Speed Reduction: Steps down high engine crankshaft RPM ($1500-2000\text{ rpm}$) to efficient low propeller speeds ($300-500\text{ rpm}$).
- Correct Option: Option 3 (Keeping the forward, reverse and neutral positions).
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