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Fuels and Combustion

Fuels and Combustion
Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use.

43832
150-200
70-100
15-30

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Fuels and Combustion
During coking of coal, the ash content (percentage)

Remains constant
Decreases
None of these
Increases

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Fuels and Combustion
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

None of these
>71%
< 37%
In between 37 & 71%

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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
0.5
10
2.5

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Fuels and Combustion
The heat of combustion of a fuel

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

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Fuels and Combustion
With increase in C/H ratio of a fuel, the dew point of flue gases

May increase or decrease ; depends on the type of fuel
Increases
Decreases
Remains same

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