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Fuels and Combustion

Fuels and Combustion
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always

Unpredictable
< 1
> 1
1

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Fuels and Combustion
With increase in moisture content of coal, its

Clinkering tendency during combustion increases
Bulk density always decreases
Calorific value increases sometimes
None of these

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Fuels and Combustion
Function of secondary air in pulverised coal firing is to

Ensure efficient burning of coal around the burner
Reduce primary air requirement
Dry the coal
Transport the coal to the burner

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

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

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Fuels and Combustion
Blast furnace gas burns with a bluish flame, because of the presence of

S
CO
CH₄
CO₂

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Fuels and Combustion
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm³.

4000
2500
6500
10000

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