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Fuels and Combustion

Fuels and Combustion
The calorific value is the highest out of the following for

Water gas
Coke oven gas
Producer gas
Blast furnace gas

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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
500
1100
950

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Fuels and Combustion
Coke oven gas burns with an yellowish flame, because of the presence of

CO₂
H₂
NH₃
CH₄

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

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

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Fuels and Combustion
Octane number of 2, 2, 4 - trimethyl pen-tane is

100
In between 0 and 100
More than 100

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Fuels and Combustion
Coking time in a commercial high temperature coal carbonisation plant is about __________ hours.

36
28
6
18

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