As shown in the illustration, if one of the...

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Question 1 of 205eccefa4bacbc34ba4d4845e

As shown in the illustration, if one of the navigation running light bulbs on service burns out, the operator will receive an alarm. After renewing the burned out light bulb and restoring service to that running light bulb, it is found that the alarm still cannot be silenced. What is the probable cause for this condition in terms of the replacement component? See illustration EL-0058.

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🔍 Key Concepts

• Series current-sensing relay used to detect lamp failure on navigation light panels • Relationship between lamp wattage, current draw, and relay operation at a fixed system voltage • How a lower vs higher wattage bulb affects current in the circuit and the alarm condition

💭 Think About

• Look at the schematic: where is the trouble relay placed in relation to the running light bulb, and what electrical quantity is it likely sensing to decide if the alarm should sound? • At a fixed system voltage, if you install a bulb with lower wattage than specified, what happens to the current through the circuit and how might that affect the relay coil? • Which option explains why the light now works again, but the alarm circuit still does not see "normal" operating conditions and therefore cannot reset?

✅ Before You Answer

• Confirm that at constant voltage, current is related to wattage by I = P/V; a lower wattage lamp draws less current. • Verify on the diagram that the trouble relay depends on enough load current through its coil to pick up and silence the alarm. • Eliminate any choice that talks about the bulb burning out again, since the question says the new bulb is in service but the alarm remains on.

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