While a vessel is underway the low-pressure...

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Question 1 of 205eccefa1bacbc34ba4d47333

While a vessel is underway the low-pressure turbine high-speed pinion is damaged. The pinion is then removed from the gear train. Under these circumstances, the main unit is capable of which speed and direction?

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🔍 Key Concepts

• How a geared steam turbine plant uses separate high‑pressure (HP) and low‑pressure (LP) turbines for ahead power • The role of the high‑speed pinion in transmitting LP turbine power to the main reduction gear • How the astern turbine is arranged in the gear train compared with the ahead turbines

💭 Think About

• Think about which turbine (HP, LP, or astern) is affected when the LP high‑speed pinion is removed, and which components are still able to drive the main reduction gear • Ask yourself: after removing the LP high‑speed pinion, can any turbine still drive the shaft for ahead power? What about for astern power? • Consider how the loss of one turbine’s gear connection changes the maximum available power and thus whether only reduced or full speed is possible in each direction

✅ Before You Answer

• Identify clearly which turbine(s) provide ahead power and which provide astern power in a typical geared turbine arrangement • Verify whether the astern turbine has its own gearing path to the main reduction gear, or if it depends on the damaged LP pinion • Check which remaining turbine(s) can still safely transmit power after the LP high‑speed pinion is removed, and whether their power would be reduced or full in each direction

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