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Fuels and Combustion

Fuels and Combustion
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³.

30
3000
300
30, 000

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

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

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Fuels and Combustion
Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of

BaSO₄ & NaCl
MgSO₄ & BaCl₂
MgO & Na₂CO₃
MgCO₃ & NaCl

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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.

500
1100
950
750

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Fuels and Combustion
Main constituents of purified Lurgi gas are

N₂, H₂ & CO₂
CO₂, O₂ & CO
CO, H₂ & CH₄
H₂, CmHn & CO₂

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Fuels and Combustion
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Speed of combustion of fuel
Heat transfer rate to the stock in the furnace
Calorific value of the fuel
Flame temperature achieved

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