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Fuels and Combustion

Fuels and Combustion
A sooty flame can be made non-luminous by

Shutting air supply
Shutting gas supply
Admitting more gas
Admitting more air

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Fuels and Combustion
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.

Electrical resistivity
Porosity
None of these
Density

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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
Caking index of coal blend used for blast furnace coke making is about

12
22
8
36

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Fuels and Combustion
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of

Blast furnace gas
Fuel oil
Pitch
Bituminous coal

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Fuels and Combustion
Junker's calorimeter is used to determine the calorific value of

Gaseous fuels
None of these
Fuel oil
Pulverised coal

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