The searchlight on a survival craft must be capable of operating 3 hours continuously or 6 hours intermittently if operated in which cycles?
• SOLAS requirements for survival craft equipment, especially portable lights and searchlights • Difference between continuous operation time and intermittent (duty cycle) operation • How operating time changes based on the ratio of ON time to OFF time
• If a battery can power the light for 3 hours continuously, what must be true about the ON/OFF pattern to stretch that energy out to 6 hours total time? • Which ON/OFF cycle uses less average power over the 6-hour period, and how does that relate to total operating time? • Compare each choice: in a 15-minute period, how many minutes is the light actually ON versus OFF?
• Calculate or compare the fraction of time ON for each duty cycle (e.g., ON minutes / total cycle minutes). • Verify which cycle would approximately double the total usable time compared to continuous operation, given the same battery capacity. • Make sure the chosen option has a realistic rest period that could allow the battery to last 6 hours without exceeding the 3-hour equivalent ON time.
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