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Fuels and Combustion

Fuels and Combustion
Coke having higher porosity has

All of these
Lower bulk density
Higher reactivity
Lower strength

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Fuels and Combustion
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

Caking index
Calorific value
Yield of carbonised products
Friability & oxygen content

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Fuels and Combustion
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

Data insufficient; can't be predicted
Less
Same
More

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Fuels and Combustion
Higher fuel combustion efficiency can not be achieved by

Supplying correct amount of combustion air
Adopting proper fuel firing technique & fuel preparation
Reducing sulphur content in the fuel
Preheating of fuel gases & combustion air

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Fuels and Combustion
A coal containing high amount of volatile matter will have

High fusion point of its ash
Low adiabatic flame temperature
Low ignition temperature
Very little ash content

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Fuels and Combustion
Main constituents of benzol are

Ammonia & phenol
Benzene, toluene & xylene
Anthracene & phenol
Tar & creosote

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