During start-up of the circuit shown in...

Question 1 / 2066636ef128f7522a1c523140

Question 1 of 2066636ef128f7522a1c523140

During start-up of the circuit shown in figure "B" of the illustration, it is noted that the ends of component "4" alternately glow and become dark without the tube illuminating. What is the most probable cause for this condition? Illustration EL-0081

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🔍 Key Concepts

• Identify each numbered component in figure "B" (especially 3, 4, and 5) and recall the normal start‑up sequence of a preheat fluorescent lamp circuit. • Determine which component is responsible for creating the high-voltage pulse needed to strike the arc after the tube filaments (ends of component 4) have been heated. • Distinguish between a condition that affects the entire ship’s power system versus a fault confined to this one lamp circuit.

💭 Think About

• If the ends of component 4 are glowing, what does that tell you about the filament-heating and starter portion of the circuit—are they working at least partially? • In this type of circuit, when the tube repeatedly heats at the ends but never strikes an arc, which component has likely failed: the one that switches the filaments on and off, or the one that should generate a high-voltage kick when that switch opens? • Which of the answer choices describes something that is actually part of the normal operation of a fluorescent starter, and which choice describes a fault that would prevent the high-voltage starting surge?

✅ Before You Answer

• Verify which component (by number) is the ballast/inductor and what its job is during start‑up. • Verify which component (by number) is the starter and that its contacts normally open and close during normal start‑up. • Check which option best explains why the lamp ends keep heating (so current is flowing) yet the tube never receives a sufficient starting voltage to ionize the gas.

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Question 1 of 20

component "2" is loose and due to the ship's vibrations makes and breaks contact

the power system's voltage is fluctuating in and out of the range necessary for proper operation

component "3" is shorted and therefore unable to produce the high voltage required to start the lamp

component "5" contacts are opening and closing thus prohibiting sufficient current flow

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Question 1 / 2066636ef128f7522a1c523140

Question 1 of 2066636ef128f7522a1c523140

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Question 1 of 20

66636ef128f7522a1c523140

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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