Question 379Electricity/Electronics - Assistant Engineer70% to pass
Referring to the illustration pertaining to the semi-automatic navigation light panel circuit, if the buzzer sounds and the masthead indicator light comes on, what statement is true concerning acknowledging and responding to the alarm while minimizing the danger to navigation? Illustration EL-0108
AI Explanation
The correct answer is B.
The buzzer sounding and the masthead indicator light coming on indicates that the primary masthead lamp has failed. To silence the buzzer and illuminate the masthead light, the masthead transfer switch in the line section should be turned to the secondary lamp position. This will switch the circuit to the secondary masthead lamp, silencing the buzzer and illuminating the masthead light. This allows the navigation lights to remain operational while the burned out primary lamp is replaced, minimizing the danger to navigation.
The other options are incorrect because:
A) Turning the masthead transfer switch off would leave the navigation lights inoperative.
C) Turning the master switch off would leave all navigation lights inoperative.
D) The buzzer can be silenced, and the masthead light can be illuminated, by switching to the secondary lamp.
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