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Fuels and Combustion

Fuels and Combustion
Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.

300
5000
2000
10000

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Fuels and Combustion
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³ ), while the C.V. is same on weight basis (i.e., kcal/kg) ?

F. gas and coke oven gas
Sewage gas and gobar gas
Propane and acetylene
Propane and LPG

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Fuels and Combustion
Calorific value of dry wood may be around __________ Kcal/kg.

5
500
5000
50

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Fuels and Combustion
Coke compared to the coal from which it has been made, contains

Less volatile matter
All of these
Greater percentage of ash
More carbon

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Fuels and Combustion
Presence of __________ in a dry gaseous fuel does not contribute to its calorific value.

Carbon
Sulphur
Hydrogen
Oxygen

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Fuels and Combustion
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

105
145
70
85

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