When two direct air start reversible medium...

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Question 1 of 205eccefa3bacbc34ba4d47d09

When two direct air start reversible medium speed diesel engines are coupled in parallel to a common propeller shaft, which of the operating conditions listed will apply during extended periods of maneuvering?

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🔍 Key Concepts

• Direct-reversible medium-speed diesel engines and how they develop torque in ahead vs astern directions • What extended maneuvering typically requires from propulsion systems (frequent speed and direction changes) • How parallel-coupled engines on a common shaft practically operate during harbor or docking maneuvers

💭 Think About

• Think about how much astern power and control you realistically need during long periods of maneuvering compared to normal sea speed operation. • Consider whether both engines must (or can safely) provide full power in both directions when tied to a single common shaft. • Ask yourself what makes maneuvering safer: continuously changing clutches/engine direction, or a simpler, more direct torque arrangement?

✅ Before You Answer

• Check which option describes a condition that is realistic for engine design limits, especially for torque astern vs ahead. • Verify which statement fits the idea that both engines are on one common shaft, not independent controllable-pitch propellers or separate shafts. • Eliminate any option that sounds like a general design feature of medium-speed diesels but doesn’t specifically depend on having two engines on a common shaft used for maneuvering.

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