Of the following propulsion modes, which one...

Question 1 / 270705eccef9cbacbc34ba4d45ab4

Question 1 of 270705eccef9cbacbc34ba4d45ab4

Of the following propulsion modes, which one would operate with a geared-drive featuring a single reduction?

Question 1 of 27070

Of the following propulsion modes, which one would operate with a geared-drive featuring a single reduction?

🔍 Key Concepts

• Differences between slow-, medium-, and high-speed diesels in terms of RPM and how they connect to the propeller • Typical reduction gear arrangements used with steam and gas turbines • Why a single-reduction gear might be sufficient for certain RPM ranges but not others

💭 Think About

• Think about which prime movers naturally run at very high RPM and which run closer to propeller speed—who needs more "steps" of speed reduction? • Ask yourself: for which of these engines or turbines is direct drive to the propeller common, and for which is geared drive standard practice? • Consider which type of machinery most often uses double reduction gears instead of single, and then eliminate that from consideration.

✅ Before You Answer

• Identify the approximate operating RPM range of each option and compare it to typical propeller RPM (about 80–120 RPM for large ships). • Verify which options are commonly direct-drive (no gear), which use single reduction, and which typically require double reduction gears. • Be sure you distinguish between diesel engines and turbines, and recall how many gear stages are usually needed to bring their RPM down to propeller speed.

Question 1 of 27070

Of the following propulsion modes, which one would operate with a geared-drive featuring a single reduction?

Slow speed diesel

Medium speed diesel

Steam turbine

Gas turbine

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Question 1 / 270705eccef9cbacbc34ba4d45ab4

Question 1 of 270705eccef9cbacbc34ba4d45ab4

Of the following propulsion modes, which one would operate with a geared-drive featuring a single reduction?

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Question 1 of 27070

Of the following propulsion modes, which one would operate with a geared-drive featuring a single reduction?