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Fuels and Combustion

Fuels and Combustion
Coke having higher porosity has

All of these
Lower bulk density
Higher reactivity
Lower strength

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Fuels and Combustion
Caking coal is desirable for

All of these
Burning on firebars
Coke making
Burning on travelling grate

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Fuels and Combustion
Preheating of __________ the flame temperature.

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

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Fuels and Combustion
Gray-King Assay and Roga Index of coal is a measure of its

Grindability
Abradability
Weathering properties
Caking and swelling properties

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Fuels and Combustion
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

May increase or decrease depending on the type of fuel
Decreases
Remains same
Increases

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Fuels and Combustion
Insitu theory and drift theory are related to the

Coalification
Origin of coal
Variation of coal quality with depth
Origin of petroleum oil

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