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Fuels and Combustion

Fuels and Combustion
Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.

32 kg
22.4 Nm³
All of these
1kg mole

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Fuels and Combustion
With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion

Remains same
Decreases
Increases
Either A or B, depends on other factors

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Fuels and Combustion
Naphthalene recovered from coke oven gas is used

As moisture proof coating on fibres
For making electrodes
As moth balls (insecticides)
As a fuel in furnaces

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Fuels and Combustion
The heat of combustion of a fuel

Can't be known without calculating it
Is always negative
Is always positive
Is equal to the heat of formation

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Fuels and Combustion
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

20
96
40
4

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Fuels and Combustion
Which of the following has the least calorific value (kcal/Nm³) ?

Sewage gas
Coke oven gas
Blast furnace gas
Natural gas

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