The jacking gear must be engaged as quickly...

The jacking gear must be engaged as quickly...

Question 1 of 270705eccefa1bacbc34ba4d472d7

The jacking gear must be engaged as quickly as possible when securing the main turbines in order to __________.

Question 1 of 27070

Q

The jacking gear must be engaged as quickly as possible when securing the main turbines in order to __________.

🔍 Key Concepts

• Purpose of a jacking (turning) gear on large steam turbines • What happens inside a turbine rotor as it cools while sitting still • Why slow rotation after shutdown is important for big, hot rotating machinery

💭 Think About

• Think about which part of the main turbine is most at risk if it stays stopped and very hot in one position. • Ask yourself: does the jacking gear mainly move oil, cool bearings, cool gears, or protect the shape/alignment of the rotor? • Consider what “uneven cooling” could physically do to a long, heavy turbine shaft that is only supported at the bearings.

✅ Before You Answer

• Identify which choice deals directly with the rotor/shaft condition during cool-down, not normal running. • Separate options that talk about lubrication or cooling of other parts (bearings/gears) from the one that focuses on thermal stresses in the rotor. • Confirm in your mind that jacking gear turns the shaft slowly after shutdown, and ask: which option best matches the reason for that slow turning?