Referring to the illustration pertaining to...

Question 1 / 2066636eed28f7522a1c51d9bd

Question 1 of 2066636eed28f7522a1c51d9bd

Referring to the illustration pertaining to the semi-automatic navigation light panel circuit, assuming that the transfer switch is in the primary lamp position, in addition to the buzzer sounding, what will be the response of the indicator lamps when the primary lamp of the particular navigation light burns out? Illustration EL-0108

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Question 1 of 20

66636eed28f7522a1c51d9bd

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🔍 Key Concepts

• Semi-automatic navigation light panels use a trouble relay that changes contact position when the primary lamp current is lost. • The buzzer bus in the master section and the indicator light in the line section are both controlled by the trouble relay contacts. • When the transfer switch is on the primary lamp, the secondary lamp is still available but normally not energized until a failure is detected.

💭 Think About

• Trace the circuit from the supply bus, through the primary lamp, to the trouble relay coil: what happens to the coil when the primary lamp burns out? • With the relay coil de-energized, use the contact positions shown in the diagram to see which paths close toward the buzzer bus and which toward the indicator lamps. • Ask yourself: in a fault condition, should the bridge know which line has failed, and should the master indicator go on or off to show a system fault?

✅ Before You Answer

• Verify, using the contacts shown with coil de-energized, which indicator (master or line section) is connected to the buzzer bus in the failure condition. • Check whether the master indicator is wired in series or parallel with the buzzer, and whether loss of the primary lamp removes power from that circuit. • Confirm whether the line section indicator is normally dark in healthy operation and only receives power via the trouble relay when the primary lamp circuit opens.

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Question 1 of 20

The indicator lamp in the master section will go OUT The indicator lamp in the effected line section will come ON

The indicator lamp in the master section will remain ON The indicator lamp in the effected line section will come ON

The indicator lamp in the master section will remain ON The indicator lamp in the effected line section will go OUT

The indicator lamp in the master section will go OUT The indicator lamp in the effected line section will go OUT

Question 1 / 2066636eed28f7522a1c51d9bd

Question 1 of 2066636eed28f7522a1c51d9bd

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Question 1 of 20

66636eed28f7522a1c51d9bd

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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