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Fuels and Combustion

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

60
750
500
160

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Fuels and Combustion
Main constituents of purified Lurgi gas are

H₂, CmHn & CO₂
N₂, H₂ & CO₂
CO₂, O₂ & CO
CO, H₂ & CH₄

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Fuels and Combustion
Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is

20
0
12.5
10

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Fuels and Combustion
Overfire burning in a furnace is a phenomenon characterised by the

Supply of excess air
None of these
Supply of excess fuel
Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air

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Fuels and Combustion
Caking index of the coal blend used for the manufacture of metallurgical coke should be around

21
40
48
5

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Fuels and Combustion
Volatile matter content in coking coal may be about __________ percent.

1
46
7
22

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