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Fuels and Combustion

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

Hydrogen
Oxygen
Carbon
Sulphur

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Fuels and Combustion
Fuel consumption in coke making can be reduced by

All of these
Stamped charging of coal
Dry quenching of coke
Preheating, blending and de-ashing the coal

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Fuels and Combustion
With increase in calorific value of fuels, their adiabatic flame temperatures

Decrease
May increase or decrease ; depends on the quantity of products of combustion
Remain unchanged
Increase

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Fuels and Combustion
'Wind loss' resulting from unscientific storage of coal may be the order of about __________ percent.

10.5
14.5
2.5
7.5

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Fuels and Combustion
Use of preheated air for combustion of fuel in the furnace, increases the

Scale losses of the furnace stock
Flame temperature
Calorific value of the fuel
None of these

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Fuels and Combustion
Ignition temperature decreases progressively from anthracite to lignite, because

Moisture content increases
Volatile matter content increases
Ash content increases
Carbon content decreases

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