When preparing to get underway and the...

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Question 1 of 205eccefa1bacbc34ba4d472d8

When preparing to get underway and the jacking gear has been disengaged, the main turbine rotor should NOT be allowed to remain stationary for more than 3 minutes because __________.

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Question 1 of 20

5eccefa1bacbc34ba4d472d8

When preparing to get underway and the jacking gear has been disengaged, the main turbine rotor should NOT be allowed to remain stationary for more than 3 minutes because __________.

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🔍 Key Concepts

• purpose of the jacking gear on a steam turbine and what it protects against • effects of uneven heating on a long, heavy turbine rotor (rotor bowing or distortion) • which systems would realistically be affected in only a few minutes of standstill before getting underway

💭 Think About

• Ask yourself: What is the jacking gear actually doing for the rotor when it turns very slowly, and what risk appears when you stop that motion while steam conditions are changing? • Look at each choice and decide: Which one directly involves the rotor’s shape/alignment versus external systems like drains, vacuum, or lube oil? • Consider the time frame: In just about 3 minutes, which problem is most likely and most critical during pre‑departure preparations with steam up but rotor nearly stopped?

✅ Before You Answer

• Verify which option deals with rotor distortion or bending rather than system performance (vacuum, drains, bearings). • Check whether lube oil flow and condenser vacuum depend on rotor motion, or mainly on pumps and auxiliary equipment that run regardless of shaft rotation. • Confirm which effect is strongly linked to hot steam around a stationary shaft and is serious enough to limit standstill time to only a few minutes.

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Question 1 of 205eccefa1bacbc34ba4d472d8

When preparing to get underway and the jacking gear has been disengaged, the main turbine rotor should NOT be allowed to remain stationary for more than 3 minutes because __________.

Back

Question 1 of 20

5eccefa1bacbc34ba4d472d8

When preparing to get underway and the jacking gear has been disengaged, the main turbine rotor should NOT be allowed to remain stationary for more than 3 minutes because __________.

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

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed