What statement concerning the operation of a...

Question 1 / 2066636ef128f7522a1c521984

Question 1 of 2066636ef128f7522a1c521984

What statement concerning the operation of a propulsion steam turbine turning (jacking) gear is true?

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Question 1 of 20

66636ef128f7522a1c521984

What statement concerning the operation of a propulsion steam turbine turning (jacking) gear is true?

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🔍 Key Concepts

• Purpose of turbine turning (jacking) gear in large propulsion steam turbines • How uneven heating or cooling can affect a long, heavy rotor (sagging/bowing) • When engineers typically engage the turning gear: during warm‑through, cool‑down, and/or lay‑up

💭 Think About

• Think about what happens to a long steel rotor if one side is hotter than the other while it is not rotating. How does slow rotation help? • Consider whether temperature differences can exist only when warming up, only when cooling down, or during both processes. • Ask yourself: besides starting or stopping, is there any other time the turning gear might be used, and is distortion prevention one of its main purposes?

✅ Before You Answer

• Verify whether thermal distortion (rotor bowing/sagging) can occur during both heating and cooling, not just one of them. • Check if standard engineering practice treats distortion prevention as a primary reason for using the turning gear, or if it is used only for periodic rotation with no concern for distortion. • Eliminate any choice that says the gear is "never used" during a phase where temperature gradients and rotor distortion are clearly possible.

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Question 1 of 20

What statement concerning the operation of a propulsion steam turbine turning (jacking) gear is true?

The turning gear is used to prevent turbine rotor distortion while warming-through or while cooling, since distortion is an issue when warming-through or cooling.

The turning gear is used to prevent turbine rotor distortion while warming-through only. The turning gear is never used while cooling since distortion is not an issue when cooling.

The turning gear is used to prevent turbine rotor distortion while cooling only. The turning gear is never used while warming-through since rotor distortion is not an issue when warming-through.

The turning gear is used to rotate the turbines, gearing, and shaft periodically when the main engines are secured only. The turning gear is never used to prevent turbine rotor distortion.

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Question 1 / 2066636ef128f7522a1c521984

Question 1 of 2066636ef128f7522a1c521984

What statement concerning the operation of a propulsion steam turbine turning (jacking) gear is true?

Back

Question 1 of 20

66636ef128f7522a1c521984

What statement concerning the operation of a propulsion steam turbine turning (jacking) gear is true?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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