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Fuels and Combustion

Fuels and Combustion
For every 10% increase in the excess air; the fuel consumption increases by __________ percent.

5
2
0.1
10

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Fuels and Combustion
Preheating of a gaseous fuel results in increased

Quantity of flue gas
Ignition temperature
Flame length
Flame temperature

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Fuels and Combustion
Low temperature oxidation of coal during storage does not decrease its

None of these
Calorific value
Oxygen content
Caking power

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Fuels and Combustion
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

400-500
1700-1800
900-1000
1400-1500

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Fuels and Combustion
Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about __________ percent.

55
25
5
75

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Fuels and Combustion
Highly reactive coke have lower

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

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