Related Questions

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
Coke oven gas compared to blast furnace gas is
A More explosive and inflammable
B Less poisonous
C Lighter
D All of the above
Width of the coke oven towards coke side is slightly more than that on pusher side to
A Facilitate easy discharging of coke as it swells during carbonisation
B Facilitate uniform heating of the oven
C Increase the output of the coke
D None of these
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
A The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
B It reduces its calorific value tremendously
C It reduces its flame temperature tremendously
D There are chances of explosion during preheating
Abrasion index of blast furnace coke should be around __________ percent.
A 20
B 35
C 80
D 55
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
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
Size of blast furnace grade coke is __________ mm.
A 25-80
B 0-15
C 15-25
D >100
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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