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Fuels and Combustion

Fuels and Combustion
Which of the following gaseous fuels has the lowest calorific value?

Gobar gas
Converter gas
Blast furnace gas
Refinery gas

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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?

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

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Fuels and Combustion
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?

Durain
Vitrain
Clarain
Fussain

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Fuels and Combustion
Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind?

50
100
85
70

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Fuels and Combustion
Abrasion index of blast furnace coke should be around __________ percent.

55
35
20
80

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Fuels and Combustion
Which of the following is not used as a binder in coal briquetting?

Line
Molasses
Pitch
Tar

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