Fuels and Combustion
Deficiency of combustion air during combustion of a gaseous fuel

Shortens the flame
Lengthens the flame
Causes heat loss of fuel by its partial combustion
Both A & B

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Fuels and Combustion
Cannel coal

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

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