Related Questions

Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
A 20
B 40
C 60
D 80
Caking index of coal blend used for blast furnace coke making is about
A 8
B 12
C 22
D 36
Size of blast furnace grade coke is __________ mm.
A 25-80
B 0-15
C 15-25
D >100
Coke is added in the blast furnace to
A Reduce & melt the iron ore
B Increase the fluidity of slag
C Remove sulphur & phosphorus from molten metal
D None of these
Blast furnace gas compared to coke oven gas has
A Lower ignition temperature
B Narrower limit of inflammability
C Higher calorific value
D Lower theoretical flame temperature
Increase in ash content of blast furnace coke
A Reduces its consumption in the furnace
B Increases its consumption in the furnace
C Does not affect its consumption in the furnace
D Decreases its hardness and abrasion resistance
The coke in the charge of blast furnace
A Controls the grade of pig iron
B Acts as an iron bearing mineral
C Supplies heat to reduce ore and melt the iron
D Forms a slag by combining with impurities
Coke oven gas is a better fuel than blast furnace gas, because of its higher
A Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
B Adiabatic flame temperature
C Heat release rate (thus requiring smaller combustion chamber)
D All of the above
Coke oven gas compared to blast furnace gas is
A More explosive and inflammable
B Less poisonous
C Lighter
D All of the above
Blast furnace coke is made from coal by
A Low temperature carbonisation
B High temperature carbonisation
C Medium temperature carbonisation
D Heating the coal in an oven in presence of air

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