Arizona Driving Permit Written Practice Exam

The low water fuel cut-off (LWCO) is a critical safety device that:

Shuts off the feedwater pump if level gets too low Shuts off the burner fuel supply if water drops below a safe minimum level Increases firing rate when water is low Opens the safety valve

Correct Answer:

Shuts off the burner fuel supply if water drops below a safe minimum level

Explanation:

LWCO prevents dry-firing and catastrophic boiler failure by shutting down the burner when water is dangerously low.

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