The auxiliary boiler feed water level...

Question 1 / 270705eccefa3bacbc34ba4d47c3d

Question 1 of 270705eccefa3bacbc34ba4d47c3d

The auxiliary boiler feed water level control shown in the illustration, utilizes __________. See illustration MO-0047.

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Question 1 of 27070

The auxiliary boiler feed water level control shown in the illustration, utilizes __________. See illustration MO-0047.

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

🔍 Key Concepts

• On-off vs modulating control in boiler feedwater systems • How multiple level electrodes/probes are used to start and stop a feed pump over a level band (differential gap) • The difference between proportional / PI / PID control and simple contact-type level control

💭 Think About

• Look closely at the illustration: do you see any moving float, bellows, diaphragm, or flapper–nozzle that could produce a continuously varying signal, or only fixed electrodes that make/break contacts at certain levels? • Ask yourself whether this device can position a feedwater regulating valve smoothly anywhere between fully open and fully closed, or if it can only switch the pump/valve fully on or fully off at set levels. • Think about how proportional, proportional-plus-reset, and proportional-plus-reset-plus-rate controllers normally appear in diagrams: what extra mechanisms or control elements would you expect to see that are not present here?

✅ Before You Answer

• Verify whether the three vertical rods in the housing act as discrete level switches (e.g., pump on, pump off, alarm) rather than a single continuous sensing element. • Confirm if the control action would produce a band of water level between upper and lower switch points instead of continuously holding one exact level. • Before choosing, ask: "Does this sketch more closely match a simple on/off level controller with a differential band, or a complex modulating controller (proportional/PI/PID) with continuous output?"

Question 1 of 27070

The auxiliary boiler feed water level control shown in the illustration, utilizes __________. See illustration MO-0047.

two position differential gap action

proportional action

proportional plus reset action

proportional plus reset plus rate action

Question 1 / 270705eccefa3bacbc34ba4d47c3d

Question 1 of 270705eccefa3bacbc34ba4d47c3d

The auxiliary boiler feed water level control shown in the illustration, utilizes __________. See illustration MO-0047.

Back

Question 1 of 27070

The auxiliary boiler feed water level control shown in the illustration, utilizes __________. See illustration MO-0047.

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