Your main propulsion boilers are equipped...

Question 1 / 205eccefa1bacbc34ba4d47325

Question 1 of 205eccefa1bacbc34ba4d47325

Your main propulsion boilers are equipped with a two element feed water regulating control system. While on watch, you are required to respond to a 'slow' bell from full sea speed. Under these conditions the automatic feed water regulator will have __________.

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🔍 Key Concepts

• two-element feedwater control: what two variables does it sense and compare? • behavior of steam drum level during rapid load changes (swell vs. shrink) • how a sudden reduction in steam demand affects steam flow, drum pressure, and apparent water level

💭 Think About

• When you go from full sea speed to a slow bell, does steam flow demand increase or decrease? How does that affect drum pressure and bubble content in the water? • In a shrink condition, does the indicated drum level move up or down? In a swell condition, does it move up or down? • Ask yourself whether the controller is seeing a higher or lower level and a higher or lower steam flow signal, and how a two-element system reacts to those combined signals.

✅ Before You Answer

• Clarify the difference between swell (apparent level rise) and shrink (apparent level drop) in a steam drum. • Confirm what the two elements are in a two-element feedwater regulator (typically drum level and steam flow). • Check which option correctly links the direction of level change (swell or shrink) with the expected controller action on the feedwater valve (open more vs. close down).

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Question 1 of 20

opened the feed water valve wide due to the effect of shrink

closed down on the feed water valve due to the decrease in steam flow demand

partially closed down on the feed water valve due to the effect of swell

fully opened the feed water valve due to the increase in steam flow

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Question 1 / 205eccefa1bacbc34ba4d47325

Question 1 of 205eccefa1bacbc34ba4d47325

Back

Question 1 of 20

5eccefa1bacbc34ba4d47325

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🔍 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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