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Fuels and Combustion

Fuels and Combustion
During its calorific value determination by bomb calorimeter, coal is combusted by

Oxygen enriched air
Air
Oxygen
None of these

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Fuels and Combustion
Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.

>120
90-110

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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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Fuels and Combustion
The calorific value is the highest out of the following for

Producer gas
Blast furnace gas
Coke oven gas
Water gas

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Fuels and Combustion
Highly reactive coke have lower

Porosity
Both B and C
Critical air blast (CAB) value
Coke reactivity index (CRI)

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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?

85
100
50
70

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