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Fuels and Combustion

Fuels and Combustion
The calorific value of producer gas is around __________ kcal/Nm³

9000
1300
4500
500

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Fuels and Combustion
High temperature in gasification of coal favours

High production of CO₂
Both B and C
Low production of CO₂
High production of CO

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Fuels and Combustion
Oxygen percentage (by weight) in atmospheric air is

23
19
21
29

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

Aromatic content of tar is low
H₂ content in the coke oven gas is more
Yield of ammonia is less
Calorific value of the coke oven gas is lower

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Fuels and Combustion
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

750
1100
950
500

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Fuels and Combustion
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.

20
10
2.5
0.5

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