With vacuum up and the main propulsion...

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Question 1 of 205eccefa1bacbc34ba4d472c8

With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to __________.

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Question 1 of 20

5eccefa1bacbc34ba4d472c8

With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to __________.

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🔍 Key Concepts

• Effect of uneven heating on long turbine rotors when sitting still in one position • What happens to clearances between rotor, casing, and bearings if the rotor sags or distorts • Normal methods used to pre-warm lube oil and bearings before standby

💭 Think About

• When a large turbine is held at a standstill under vacuum, which part is most vulnerable to damage from temperature differences: the bearings, the glands, or the rotor itself? Why? • If the lube oil system and gland steam are already on line, what additional purpose does slowly rolling the turbine ahead and astern serve that those systems alone cannot achieve? • Which choice describes a problem that could become serious and permanent if the turbine remained stopped in one position for a long time while hot?

✅ Before You Answer

• Confirm how rotor sag/warp can develop when a hot rotor is left stationary for long periods • Consider how lube oil temperature is normally controlled (preheaters, recirculation) without needing to roll the turbine • Verify which of the options relates directly to preserving rotor alignment and clearances rather than just warming individual components

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Study

Question 1 of 205eccefa1bacbc34ba4d472c8

With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to __________.

Back

Question 1 of 20

5eccefa1bacbc34ba4d472c8

With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to __________.

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