What does the term singled-up refer to when dealing with propulsion turbines?

The term "singled-up" specifically refers to the operational state of propulsion turbines in a situation where one turbine is out of commission while the other is operational. This means that the ship is able to proceed and maneuver using only the functioning turbine. This is a critical concept in marine engineering and naval operations, as it highlights the flexibility and contingency planning inherent in naval propulsion systems.

When a vessel is "singled-up," it indicates that while there may be a loss of redundancy (having two turbines), operations can still continue, albeit potentially at a reduced capacity or speed. This makes it a vital term for Machinist’s Mates to understand, as they are responsible for the upkeep and operational readiness of these systems.

In contrast, the other options do not correctly describe the term in question. Running both turbines simultaneously would indicate a full operational capacity, but that does not align with the idea of being "singled-up." Using one turbine as backup suggests an arrangement where one turbine is meant to take over in case the other fails, which is not what singled-up entails. Lastly, operating without auxiliary systems does not relate to the condition of the propulsion turbines directly, as auxiliary systems are separate from the primary propulsion mechanism. Therefore, the recognition of