Which two control inputs are dominant on a...

Question 1 / 2707066636ef128f7522a1c521aa5

Question 1 of 2707066636ef128f7522a1c521aa5

Which two control inputs are dominant on a steam boiler with a three element feed water control?

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Question 1 of 27070

Which two control inputs are dominant on a steam boiler with a three element feed water control?

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🔍 Key Concepts

• three-element feedwater control on a boiler (what each "element" measures) • difference between measured flows (steam and feedwater) vs stored inventory (drum level) • how quick each signal responds to sudden load changes (like a rapid increase in steam demand)

💭 Think About

• When steam demand suddenly increases, which signals change first and most directly, and which one lags due to drum swelling/shrinking? • In a three-element system, which two signals are typically used to set up the main feedwater flow control, and which signal is usually used as a trimming or correcting input? • Think about which measurements represent flow through the system versus level in the storage vessel and which would logically drive the main control action.

✅ Before You Answer

• Identify clearly what each element measures: drum level, steam flow, and feedwater flow. • Decide which of those three is primarily used as a trim or corrective input rather than the main driving signals. • Before choosing, ask: which two inputs must be tightly matched to each other to keep mass balance in the boiler under changing loads?

Question 1 of 27070

Which two control inputs are dominant on a steam boiler with a three element feed water control?

Steam flow and feed water flow.

Drum level and steam flow.

Drum level and feed water flow.

None are dominant, all three effect output equally.

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Question 1 / 2707066636ef128f7522a1c521aa5

Question 1 of 2707066636ef128f7522a1c521aa5

Which two control inputs are dominant on a steam boiler with a three element feed water control?

Back

Question 1 of 27070

Which two control inputs are dominant on a steam boiler with a three element feed water control?

If the question has a related picture, it will appear here.