When an auxiliary boiler is on the line, the...

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Question 1 of 205eccefa3bacbc34ba4d47c6d

When an auxiliary boiler is on the line, the output of the flame scanner can be checked by placing a microammeter in series with the photoelectric cell circuit. The readings on high fire should be __________.

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🔍 Key Concepts

• Photoelectric cell operation in flame scanners (more light vs less light) • Relationship between flame intensity (high fire vs low fire) and output current • Purpose of monitoring microamp signal for flame strength/safety

💭 Think About

• Ask yourself: when the flame is stronger and brighter at high fire, what happens to the light reaching the photoelectric cell? How does that usually affect current in a photoelectric circuit? • Think about why the boiler control system uses microamp readings. Does it want a stronger or weaker signal when the flame is more stable (high fire)? • Consider which choices would make it easier for a safety system to detect a weak or failing flame—would a low flame give a lower or higher signal?

✅ Before You Answer

• Verify how photoelectric cells respond to increased light: does the microamp current go up or down? • Confirm that the flame scanner signal is used as an indication of flame strength, so the reading at high fire should clearly differ from low fire in a logical way. • Check if any answer choice includes an internal contradiction between current and voltage behavior for a simple photoelectric circuit.

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