What component energizes and deenergizes the pump to control the hotwell level?

Prepare for the Machinist's Mate (MM) "A" School Test 3. Study with our extensive collection of flashcards and multiple-choice questions, complete with hints and explanations to ensure you're ready for the exam.

Multiple Choice

What component energizes and deenergizes the pump to control the hotwell level?

Explanation:
The function here is level sensing that directly drives the pump. A float switch uses a buoyant float attached to a switch; as the hotwell level rises, the float lifts and closes contacts, energizing the pump to remove water. When the level drops to a lower point, the switch opens and the pump turns off. This on/off action keeps the hotwell within its desired range, often with a bit of hysteresis to prevent rapid cycling. A pressure switch would react to pressure rather than level, a thermocouple measures temperature, and a control relay by itself isn’t a level sensor—it needs a sensing device like a float switch to actually energize or deenergize the pump.

The function here is level sensing that directly drives the pump. A float switch uses a buoyant float attached to a switch; as the hotwell level rises, the float lifts and closes contacts, energizing the pump to remove water. When the level drops to a lower point, the switch opens and the pump turns off. This on/off action keeps the hotwell within its desired range, often with a bit of hysteresis to prevent rapid cycling.

A pressure switch would react to pressure rather than level, a thermocouple measures temperature, and a control relay by itself isn’t a level sensor—it needs a sensing device like a float switch to actually energize or deenergize the pump.

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