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Fuels and Combustion

Fuels and Combustion
__________ has the widest inflammability limit (explosion limit) of all the gases.

Carbon monoxide
Methane
Acetylene
Hydrogen

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Fuels and Combustion
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.

160
60
500
750

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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.

85
145
70
105

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Fuels and Combustion
Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as

M = A
M = 1.8 A
M = 1.1 A
M = 0.5 A

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Fuels and Combustion
For maximum discharge through a chimney, its height should be

200 meters
Equal to the height of the hot gas column producing draught
More than 105.7 metres
Infinitely long

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Fuels and Combustion
Which of the following has the highest calorific value?

Sub-bituminous coal
Lignite
Anthracite
Peat

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