Question 39 CEL01 - Chief Engineer - Limited

The Correct Answer is D **Explanation for why Option D is correct:** According to 46 CFR regulations (specifically subchapters related to marine engineering, boilers, and automated controls, such as parts 54, 56, and 61 which cover design, inspection, and safety devices), the fuel pressure limit control serves as a low-fuel-pressure cutout. 1. **Initiating Safety Shutdown:** A low-fuel-pressure condition indicates insufficient fuel supply or pressure for stable and safe combustion. To test the shutdown function, the pressure must be intentionally reduced (lowered) to the cutoff set point, which is below the minimum required for safe combustion. This simulates a dangerous operating condition (e.g., potential flame failure due to lack of fuel). 2. **Restart Requirement (Manual Reset):** Safety shutdowns caused by critical faults (such as low fuel pressure, low water level, or high steam pressure) are typically designed to require a manual reset. This is a standard safety feature mandated by regulations to ensure that a competent operator investigates the cause of the shutdown before restarting the boiler. Allowing automatic restart after a critical safety trip (like a fuel pressure failure) would be dangerous, as the underlying fault might still exist, leading to immediate reignition issues or furnace explosions. **Explanation of why other options are incorrect:** * **A) Incorrect:** Raising the fuel pressure to an excessively high value (above what is required) would typically activate a *high*-fuel-pressure limit control (if installed), not the *low*-fuel-pressure cutout being tested. Furthermore, automatic restart is unsafe and generally prohibited for critical shutdowns. * **B) Incorrect:** While lowering the fuel pressure initiates the correct shutdown mechanism (low-fuel-pressure cutout), the requirement for automatic restart is incorrect. Critical safety shutdowns require a manual reset. * **C) Incorrect:** Raising the fuel pressure to initiate the shutdown is incorrect for testing the *low*-fuel-pressure cutout. Although the manual reset requirement is correct for a safety trip, the method of initiating the trip is wrong.