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Fuels and Combustion

Fuels and Combustion
Which of the following has the highest flame speed?

C₂H₆
CH₄
CO
H₂

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Fuels and Combustion
Which is the most matured coal?

Semi-anthracite
Lignite
Bituminous
Anthracite

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Fuels and Combustion
High excess air in combustion of fuels results in

Increased fuel consumption
Smoky flame
None of these
Incomplete combustion

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Fuels and Combustion
Coal containing large quantity of __________ are difficult to wash.

Ash
Inherent mineral matter
Volatile matter
Free impurities

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Fuels and Combustion
Washing of coal decreases its

Caking index
Both B and C
Ash content
Mineral matter content

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Fuels and Combustion
A coal with high __________ content, would ignite most easily.

Volatile matter
Oxygen
Fixed carbon
Ash

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