Which of the following is used to hold the...

Question 1 / 270705eccefa1bacbc34ba4d471fd

Question 1 of 270705eccefa1bacbc34ba4d471fd

Which of the following is used to hold the poppet valves closed in a turbo-generators nozzle control speed regulator?

Question 1 of 27070

Which of the following is used to hold the poppet valves closed in a turbo-generators nozzle control speed regulator?

🔍 Key Concepts

• Turbine governing systems and how they control speed • How poppet valves are moved open vs. how they are held closed at rest • Difference between a force that is always present (mechanical) vs. one that depends on system pressure (oil/steam)

💭 Think About

• Think about what should happen to the poppet valves if the turbine suddenly loses pressure or the control oil system fails. Should they stay open or snap shut? • In a speed regulator, do you want the "fail-safe" position of the valves to be forced closed by a constant mechanical force or by a pressure that might disappear? • Which option on the list can provide a simple, reliable, and constant closing force on multiple small valves without needing any external energy source?

✅ Before You Answer

• Identify which choices depend on system pressure (and vanish if the system fails) vs. which are mechanical and always present • Recall that in many governors and regulators, the opening motion is usually done by fluid pressure, while the closing motion is often done by another means • Ask yourself which option is most commonly associated with keeping valves closed in many types of mechanical regulators and safety devices

Question 1 of 27070

Which of the following is used to hold the poppet valves closed in a turbo-generators nozzle control speed regulator?

Oil pressure

Steam pressure

Lifting beam

Springs

Question 1 / 270705eccefa1bacbc34ba4d471fd

Question 1 of 270705eccefa1bacbc34ba4d471fd

Which of the following is used to hold the poppet valves closed in a turbo-generators nozzle control speed regulator?

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Question 1 of 27070

Which of the following is used to hold the poppet valves closed in a turbo-generators nozzle control speed regulator?