The purpose of the main reduction gears is...

Question 1 / 270705eccefa1bacbc34ba4d471b1

Question 1 of 270705eccefa1bacbc34ba4d471b1

The purpose of the main reduction gears is to __________.

Question 1 of 27070

The purpose of the main reduction gears is to __________.

🔍 Key Concepts

• Reduction gear function between prime mover (engine or turbine) and propeller shaft • Typical RPM of propulsion turbines/engines vs. efficient RPM range of large propellers • What components actually handle thrust and reversing in a propulsion train

💭 Think About

• Which part of the propulsion system sets the propeller’s turning speed relative to the main engine or turbine speed? • Do reduction gears normally exist to make things faster, slower, or simply quieter? • In a conventional steam-turbine or high‑speed diesel plant, what mismatch exists between the driver’s RPM and the propeller’s most efficient RPM?

✅ Before You Answer

• Identify the mismatch in speed between the driving machine (turbine/engine) and the propeller • Decide whether thrust is mainly carried by the reduction gears or by a separate thrust bearing • Consider how reversing is usually accomplished in modern plants (reversing gear, controllable‑pitch propeller, or engine itself), and whether that is the primary purpose of the main reduction gears

Question 1 of 27070

The purpose of the main reduction gears is to __________.

provide a means of reversing the main engines in an emergency

transmit vibration and thrust to the ship's hull

reduce engine room noise levels during high-speed operations

reduce high turbine RPM to an efficient propeller RPM

Question 1 / 270705eccefa1bacbc34ba4d471b1

Question 1 of 270705eccefa1bacbc34ba4d471b1

The purpose of the main reduction gears is to __________.

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Question 1 of 27070

The purpose of the main reduction gears is to __________.