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FUELS AND COMBUSTION

Fuels and Combustion
Low temperature oxidation of coal is accelerated by the

Storage in large heaps
All of these
Storage in compressed piles
Absence of porous or friable particles

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Fuels and Combustion
Washing of coal is done to reduce the

Adhering impurities
Mineral matter
Both B and C
Inherent impurities

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Fuels and Combustion
Low temperature oxidation of stored coal results in the

All of these
Decrease in its carbon & hydrogen content
Increase in its oxygen content
Decrease in its caking power & calorific value

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Fuels and Combustion
Adiabatic flame temperature of a fuel is dependent on the initial temperature of

Air
Fuel
Neither A nor B
Both A & B

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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

10
12.5
0
20

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