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Fuels and Combustion

Fuels and Combustion
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

550
750
1150
950

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

6500
10000
2500
4000

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Fuels and Combustion
L.D. converter gas (produced in steel plant) comprises mainly of

CO & O₂
CO₂ & H₂
CO₂ & O₂
CO (upto 65%) & CO₂

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Fuels and Combustion
Too much of excess air in combustion results in high

Stack gas temperature
Percentage of oxygen in flue gases
All of these
Fuel consumption for the same heat load

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Fuels and Combustion
Coalification means the

Complete combustion of coal
Underground gasification of coal
Direct hydrogenation of coal
Process of conversion of lignite into anthracite

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Fuels and Combustion
Volumetric ratio of N₂ to O₂ in dry atmospheric air is

0.79
3.76
0.21
4.76

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