If tasked to design a gas turbine plant for a naval vessel, which shaft arrangement offers the best flexibility for variable propulsion speeds?

• Single reduction gear arrangement, simple but not adaptable for wide load changes

• Free power turbine arrangement, enabling decoupled operation for speed flexibility

• Single-shaft arrangement, compact but limited to constant speed output

• Direct-coupled shaft arrangement, efficient but less responsive for maneuvers

A shipowner requests a propulsion system optimized for low emissions and high fuel efficiency. Which design proposal is most suitable?

• Direct-drive single-shaft turbine, reliable but less efficient under varying loads

• Combined Gas and Steam (COGAS) system, recovering waste heat for added efficiency

• Closed-cycle helium turbine, efficient but impractical for marine propulsion

• Open-cycle industrial turbine, rugged but not optimized for low emissions

If you were to create a gas turbine system for Arctic operations, which modification is most important?

• Larger exhaust silencers, which reduce noise but do not prevent icing

• Elimination of shaft redundancy, which lowers complexity but risks reliability

• Enhanced inlet air heating system, critical to prevent ice formation in cold climates

• Single fuel nozzle design, simple but not suited for extreme weather

When designing a backup starting system for marine gas turbines, which option ensures the highest reliability at sea?

• Exhaust bypass ignition starter, experimental and not standard in marine settings

• Pneumatic starter with emergency electric backup, combining redundancy and reliability

• Single electric motor starter, effective but vulnerable if the motor fails

• Manual crank starter only, impractical for large turbines

If tasked to redesign the compressor for compactness without major efficiency loss, which type is most appropriate?

• Centrifugal compressor, compact and rugged while maintaining efficiency

• Axial compressor, efficient for large flows but lengthier in design

• Mixed-flow compressor, a hybrid but less proven for marine turbines

• Twin-shaft compressor, designed for flexibility but not compactness

Why did IMO implement the global 0.5% sulfur cap in 2020?

• To reduce nitrogen oxide emissions from marine gas turbines during long voyages across emission control areas

• To eliminate greenhouse gases entirely from ship propulsion systems without requiring hybrid technologies

• To minimize sulfur oxide pollution from ships and reduce environmental damage to air quality worldwide

• To improve turbine thermal efficiency in marine propulsion systems without requiring structural redesigns

The EEDI mainly applies to which group of vessels?

• All ships in operation regardless of age, type, or tonnage, ensuring every vessel complies with design standards

• Newly constructed vessels that must meet efficiency benchmarks at the design stage before entering global fleets

• Ships under 100 gross tons including small fishing boats and ferries, covering minor vessels in local operations

• Passenger ferries only operating in coastal regions, applying efficiency requirements to this specific ship type

How does the CII differ from the EEDI?

• CII measures operational efficiency of existing ships, while EEDI applies only to the design of newly built vessels

• CII applies exclusively to new ships entering fleets, while EEDI regulates fuel use across existing global operations

• CII regulates sulfur content in ship fuels, while EEDI regulates nitrogen oxide emissions from turbine combustion

• CII is an optional voluntary measure for operators, while EEDI is mandatory for compliance with IMO standards

Why is LNG considered a cleaner marine fuel compared to MGO?

• It increases engine service life and reduces vibration during operation, improving mechanical durability overall

• It virtually eliminates sulfur oxides and significantly reduces carbon dioxide emissions from ship propulsion

• It is cheaper to store and transport compared to other fuels, reducing overall costs in global shipping operations

• It requires no specialized dual-fuel systems for ship engines, allowing continued use of existing fuel infrastructure

Why is workforce training crucial in the maritime just transition?

• To reduce shipbuilding costs significantly by lowering the labor input required in construction and assembly

• To eliminate the need for manual maintenance activities, replacing them with automated robotic procedures

• To master new propulsion systems, digital monitoring tools, and updated safety procedures for alternative fuels

• To replace gas turbine systems completely with conventional diesel engines, avoiding reliance on advanced designs