A pulsating flame, accompanied by a burner...

A pulsating flame, accompanied by a burner...

Question 1 of 270705eccefa3bacbc34ba4d47c13

A pulsating flame, accompanied by a burner developing black smoke in an auxiliary boiler, is an indication that the __________.

Question 1 of 27070

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Q

A pulsating flame, accompanied by a burner developing black smoke in an auxiliary boiler, is an indication that the __________.

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🔍 Key Concepts

• Combustion air and fuel mixture in oil-fired auxiliary boilers • Effects of fuel oil pressure on flame shape, color, and stability • How incomplete combustion leads to black smoke and unstable (pulsating) flame

💭 Think About

• Which condition would most likely cause poor atomization of fuel, leading to big droplets that don’t burn cleanly? • If ignition current or electrode setting were wrong, what would you expect to see during start-up versus during steady burning? • What boiler problem typically produces both a ‘breathing’ or hunting flame AND black smoke at the same time?

✅ Before You Answer

• Compare which options would cause incomplete combustion and black smoke rather than no flame at all • Think about how fuel atomization quality changes with pressure at the burner nozzle • Decide which choice would cause an unstable, surging flame rather than a clean, steady one