While on deck, you are observing the stack...

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Question 1 of 2066636eef28f7522a1c51f8e2

While on deck, you are observing the stack of an oil-fired auxiliary boiler installed on your general-purpose supply vessel. The gases exiting the stack are a dense white smoke. Eliminating water vapor as a possible cause of the white smoke, what would be the correlating flame color as observed through an observation window peephole?

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Question 1 of 20

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🔍 Key Concepts

• complete vs. incomplete combustion in oil-fired boilers • relationship between smoke color and flame temperature • how unburned fuel droplets affect exhaust appearance

💭 Think About

• If water vapor is ruled out, what does a dense white smoke from an oil-fired boiler usually indicate about how well the fuel is burning? • Which flame colors are associated with cooler, less efficient combustion that may leave unburned fuel or fine droplets in the exhaust? • Think about typical flame colors: which are hottest and cleanest, and which suggest poor atomization or incomplete burning?

✅ Before You Answer

• Match the combustion quality (good vs. poor) with both smoke color and flame color • Recall that hot, clean combustion produces very little visible smoke and a different flame color than white smoke conditions • Before choosing, eliminate any flame colors you associate with very hot, efficient, and nearly smokeless combustion

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