Which of the following statements describes...

Question 1 / 2066636ef128f7522a1c521397

Question 1 of 2066636ef128f7522a1c521397

Which of the following statements describes how the main propulsion turbine overspeed relay initiates closing of the throttle valve?

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Question 1 of 20

66636ef128f7522a1c521397

Which of the following statements describes how the main propulsion turbine overspeed relay initiates closing of the throttle valve?

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🔍 Key Concepts

• Mechanical vs. hydraulic (oil) overspeed trips in steam turbines • How centrifugal force is used to detect overspeed • Role of relay valves and oil pressure in closing steam throttle/control valves

💭 Think About

• Think about what part of the system actually moves the throttle/control valve toward the closed position in most marine steam turbines: is it direct mechanical linkage or a hydraulic/oil relay? • Consider which options describe a primary speed governor versus a separate overspeed safety trip device. • Ask yourself: when overspeed happens, what kind of change (mechanical movement, oil pressure, temperature) is the most immediate and reliable signal to shut steam off quickly?

✅ Before You Answer

• Identify which choices involve a direct mechanical flyball governor used mainly for speed control, not necessarily as the emergency overspeed trip. • Check which answer uses oil pressure acting on a relay valve to move the steam control or throttle valve toward shut. • Eliminate any option that relies on temperature change as the triggering factor for overspeed protection.

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Question 1 of 20

Which of the following statements describes how the main propulsion turbine overspeed relay initiates closing of the throttle valve?

Excessive centrifugal force causes spring loaded flyballs to actuate a control lever.

Excessive centrifugal force causes a spring-loaded weight to trip a valve latch.

Excessive speed causes an oil pump to develop sufficient pressure to open a spring-loaded relay valve which tends to close the steam control valve.

Excessive speed causes an increase in lube oil control temperature which actuates a solenoid oil dump valve.

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Question 1 / 2066636ef128f7522a1c521397

Question 1 of 2066636ef128f7522a1c521397

Which of the following statements describes how the main propulsion turbine overspeed relay initiates closing of the throttle valve?

Back

Question 1 of 20

66636ef128f7522a1c521397

Which of the following statements describes how the main propulsion turbine overspeed relay initiates closing of the throttle valve?

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?

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— No credit card needed