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?

Question 1 of 27070

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

🔍 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.

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?