The purpose of the main reduction gear in a...

The purpose of the main reduction gear in a...

Question 1 of 270705eccef9fbacbc34ba4d46b2d

The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following?

Question 1 of 27070

Q

The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following?

🔍 Key Concepts

• Relationship between gas turbine RPM and propeller RPM in a ship propulsion system • Function of a reduction gear in any propulsion train (what does it do to speed and torque?) • Direction of power flow: from prime mover (gas turbine) to propeller shaft

💭 Think About

• Is a marine gas turbine a high-speed or low-speed prime mover compared to a ship’s propeller? • If the turbine spins much faster than the propeller can, what must the gear set do to the speed and torque? • Look at which choices describe speed going from high-to-low vs low-to-high, and which direction real power transfer happens in a ship (from turbine to propeller, or from propeller to turbine?).

✅ Before You Answer

• Confirm that a reduction gear always changes speed in one specific direction (think of car transmission or small boat outboard gearcase). • Verify which machine (gas turbine or propeller) normally operates at higher RPM in marine applications. • Eliminate any option where the direction of speed change or direction of power flow is physically backwards for a propulsion system.