The main propulsion turbine can be damaged...

Question 1 / 270705eccefa1bacbc34ba4d472e3

Question 1 of 270705eccefa1bacbc34ba4d472e3

The main propulsion turbine can be damaged by __________.

Question 1 of 27070

The main propulsion turbine can be damaged by __________.

🔍 Key Concepts

• steam turbine blade erosion and mechanical damage • effects of water carryover versus dry steam on turbine internals • normal vs abnormal conditions for vacuum, jacking gear, and slow-speed operation

💭 Think About

• Which of these options introduces liquid water directly into high‑speed turbine stages, and what happens when droplets impact blades at high velocity? • Are high vacuum, use of jacking gear without vacuum, or slow speeds ever part of normal or controlled operating procedures, or are they always considered destructive? • In turbine operation, what is the big difference between acceptable operating stresses and sudden foreign‑material (water) impacts?

✅ Before You Answer

• Identify which choice involves liquid droplets in the steam path rather than just operating conditions. • Ask whether each condition is sometimes deliberately used by engineers during normal or maneuvering operations. • Confirm which condition is most associated with blade pitting, erosion, and deformation in propulsion turbines.

Question 1 of 27070

The main propulsion turbine can be damaged by __________.

maintaining vacuum too high

using the jacking gear when there is no vacuum

operating at slow speeds

water carryover from the boilers