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Fuels and Combustion

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

Oxygen
Air
Oxygen enriched air
None of these

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Fuels and Combustion
One kg of carbon for theoretically complete combustion requires __________ kg of air.

12
11.5
23
0.5

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Fuels and Combustion
Temperature of coke oven gas just before entering into saturator (for recovery of NH₃) is about __________ °C.

180
30
120
65

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Fuels and Combustion
Very __________ coals are completely devoid of cokability i.e, it is non coking.

Both A & B
Young
Mature
Neither A nor B

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Fuels and Combustion
Coking time in narrow by-product coke ovens is around __________ hours.

48
80
8
18

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Fuels and Combustion
Ignition temperature of a fuel in air is __________ that in pure oxygen.

Either more or less; depends on the type of fuel
Equal to
More than
Less than

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