What statement is true concerning a...

🔍 Key Concepts

• Location and function of the turning (jacking) gear in a steam turbine propulsion train • Relationship between high‑pressure (HP) and low‑pressure (LP) turbines and their reduction gear stages • Why the jacking gear must be connected to a shaft that will turn the entire shaft line safely at very low speed

💭 Think About

• Think about which turbine (HP or LP) is physically closest to the main propulsion shaft and final output to the propeller. • Ask yourself: is the jacking gear normally placed on a shaft that always turns whenever the shaft line turns, or on a shaft that might be declutched or bypassed? • Consider which reduction pinion (first or second) is better suited for slow, controlled rotation of the whole gear train without excessive mechanical stress.

✅ Before You Answer

• Verify which turbine (HP vs LP) is usually connected closest to the final reduction gear and main shaft in a typical marine steam plant layout. • Check which pinion stage (first or second reduction) is more directly linked to the propeller shaft rather than to just one turbine casing. • Confirm that the jacking gear must be able to rotate the entire propulsion shafting, not only a single turbine rotor.

What statement is true concerning a propulsion steam turbine turning (jacking) gear?

The jacking gear splined clutch is associated with the low-pressure turbine first reduction pinion.

The jacking gear splined clutch is associated with the low-pressure turbine second reduction pinion.

The jacking gear splined clutch is associated with the high-pressure turbine second reduction pinion.

The jacking gear splined clutch is associated with the high-pressure turbine first reduction pinion.

🔍 Key Concepts

💭 Think About

✅ Before You Answer