A steam driven 750 KW turbo generator has a...

Question 1 of 270705eccefa1bacbc34ba4d471ea

A steam driven 750 KW turbo generator has a rated speed of 1200 RPM. The over speed setting for this unit must not exceed __________.

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Question 1 of 27070

A steam driven 750 KW turbo generator has a rated speed of 1200 RPM. The over speed setting for this unit must not exceed __________.

🔍 Key Concepts

• Overspeed protection requirements for steam-driven generator prime movers in 46 CFR (engineering systems) • Typical percentage overspeed limit above rated RPM for turbine-driven generators used in marine service • Relationship between rated speed (100%) and allowed maximum overspeed (% of rated)

💭 Think About

• Think about what percent overspeed above 1200 RPM is typically allowed by regulations and good engineering practice for steam turbine-driven generators. • Calculate the RPM values for several common overspeed settings (e.g., 10%, 15%, 20%) above 1200 RPM and compare them to the options. • Ask yourself which answer choice is closest to—but does not exceed—the commonly accepted maximum overspeed percentage for this type and size of unit.

✅ Before You Answer

• Compute 10%, 15%, and 20% of 1200 RPM and add those values to 1200 to see which options line up with typical limits. • Verify that the chosen option represents a reasonable safety margin: high enough to avoid nuisance trips, but low enough to protect the turbine and generator mechanically. • Confirm your selection is consistent with standard marine engineering practice for steam turbine-driven generator overspeed trip settings, not for diesel engines or other machinery types.