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Fuels and Combustion

Fuels and Combustion
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

10 & 20
10 & 3
15 & 8
3 & 10

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Fuels and Combustion
__________ process is meant for direct hydrogenation of coal to produce liquid fuel.

None of these
Lurgi
Fischer-Tropsch
Bergius

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Fuels and Combustion
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

400-500
900-1000
1700-1800
1400-1500

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

Weathering properties
Abradability
Grindability
Caking and swelling properties

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Fuels and Combustion
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

CO₂, O₂, CO
O₂, CO₂, CO
CO, O₂, CO₂
CO₂, CO, O₂

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Fuels and Combustion
In high temperature carbonisation (as compared to low temperature carbonisation) of coal

All of these
Coke oven gas yield is more
Tar yield is less but free carbon in tar is more
Calorific value of coke oven gas is less

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