If steam is admitted to the main propulsion...

Question 1 / 205eccefa1bacbc34ba4d472d9

Question 1 of 205eccefa1bacbc34ba4d472d9

If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur?

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Question 1 of 20

5eccefa1bacbc34ba4d472d9

If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur?

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🔍 Key Concepts

• Purpose and function of a jacking gear on a turbine-driven vessel • What happens mechanically if the main turbine tries to turn while the jacking gear is still engaged • Relative strength and design of the jacking gear components versus the main propulsion system

💭 Think About

• Think about the torque produced by main steam on the propulsion turbine compared to the small motor driving the jacking gear. Which components are most vulnerable if both are trying to turn the shaft? • Consider which option describes a sudden, high-stress mechanical failure rather than a gradual operating condition. • Ask yourself: is the jacking gear designed to transmit full turbine torque, or just to slowly turn the shaft for maintenance and warming?

✅ Before You Answer

• Identify that jacking gear is a low-speed, low-torque device used for turning the shaft slowly during warm-up or maintenance. • Decide which listed problem would be immediate and serious if full steam torque was applied with jacking gear still engaged. • Eliminate any choices that describe conditions likely to occur even under normal, correctly operated warm-up procedures.

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Question 1 of 20

If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur?

Uneven warming of the turbine.

Destruction of the jacking gear.

Excessive tooth stress on the high-pressure first reduction pinion.

A possibility of shearing the jacking gear flexible coupling.

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Question 1 / 205eccefa1bacbc34ba4d472d9

Question 1 of 205eccefa1bacbc34ba4d472d9

If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur?

Back

Question 1 of 20

5eccefa1bacbc34ba4d472d9

If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur?

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