When more than one propulsion diesel engine...

Question 1 / 270705eccefa3bacbc34ba4d47cbb

Question 1 of 270705eccefa3bacbc34ba4d47cbb

When more than one propulsion diesel engine is connected to a single propeller shaft through reduction gears, the gears are usually __________.

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Question 1 of 27070

When more than one propulsion diesel engine is connected to a single propeller shaft through reduction gears, the gears are usually __________.

🔍 Key Concepts

• Reduction gears match high engine RPM to lower propeller RPM • Multiple engines on one shaft must share the load efficiently • Higher stages of reduction (single, double, triple, etc.) add complexity, size, and cost

💭 Think About

• Think about the typical RPM of medium- or high-speed diesel engines versus the ideal RPM of a large ship’s propeller. How big a reduction is usually needed? • If you connect more than one engine to the same shaft, does that usually call for simpler gearing or more complex gearing to combine their power smoothly? • Consider common commercial ship designs: what reduction arrangement balances efficiency, size, and mechanical complexity?

✅ Before You Answer

• Compare typical engine RPM to typical propeller RPM and decide roughly how much reduction is needed. • Ask yourself: does adding more engines to one shaft usually require more stages of reduction or just more input capability to the same reduction system? • Eliminate options that seem excessively complex for most practical ship designs versus what is actually common in industry.

Question 1 of 27070

When more than one propulsion diesel engine is connected to a single propeller shaft through reduction gears, the gears are usually __________.

single reduction

double reduction

triple reduction

quadruple reduction

Question 1 / 270705eccefa3bacbc34ba4d47cbb

Question 1 of 270705eccefa3bacbc34ba4d47cbb

When more than one propulsion diesel engine is connected to a single propeller shaft through reduction gears, the gears are usually __________.

Back

Question 1 of 27070

When more than one propulsion diesel engine is connected to a single propeller shaft through reduction gears, the gears are usually __________.