Fuels and Combustion
Preheating of __________ the flame temperature.

The gaseous fuel before combustion decreases
Either the fuel or the air does not affect
Combustion air decreases
Either the fuel or the air or both, increases

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Fuels and Combustion
Cannel coal

Is non-coking
Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named
All of these
Has a high volatile matter content and burns with a luminous smoky flame

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