Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability. Which of the key points listed would only require an alarm sensor?
• Engine protective devices: Understand what conditions must trigger an automatic shutdown to prevent immediate, severe engine damage. • Alarms vs. shutdowns: Know the difference between a condition that needs attention soon versus a condition that can destroy the engine in seconds. • Critical vs. non‑critical parameters: Consider which parameters, if lost or abnormal, will very quickly lead to seizure, fire, or catastrophic failure.
• For each option, ask: if this parameter goes out of limits and the engine is NOT shut down automatically, how fast could serious damage occur? Seconds, minutes, or longer? • Think about which devices are traditionally fitted with overspeed trips versus simple alarms in marine diesel practice. • Consider which of the listed conditions would you absolutely NOT want the control system to keep running through, even if the engineer does not respond to an alarm immediately.
• For each choice, separate what typically has both alarm AND shutdown from what often has alarm ONLY in standard marine diesel protection systems. • Verify which parameters are directly tied to metal‑to‑metal contact, bearing damage, or mechanical failure if they are out of range. • Ask yourself: which of these conditions primarily gives you an early warning of a developing problem, rather than indicating a state where continued operation is immediately dangerous?
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