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Fuels and Combustion

Fuels and Combustion
Which of the following is not endothermic?

Gasification
Cracking
Reforming
Partial oxidation

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Fuels and Combustion
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

Incomplete combustion of coal
Risk of explosion
Chances of clinker formation
Requirement of large volume combustion chamber

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Fuels and Combustion
Yield of charcoal in high temperature carbonisation of wood is about __________ percent.

25
75
10
50

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

Weathering properties
Grindability
Abradability
Caking and swelling properties

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Fuels and Combustion
Coal tar (produced by high temperature carbonisation) is the main source of

Olefins
Aromatic compounds
Alphatic compounds
Paraffins

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Fuels and Combustion
Coke having higher porosity has

All of these
Lower bulk density
Higher reactivity
Lower strength

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