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
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
In a group of 60 people, 27 like coke and 42 like borhani and each person likes at least one of the two drinks How many people like both coke and borhani?
A 9
B 129
C 69
D 15
Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.
A Colour
B Moisture content
C Ash content
D Volatile matter
Coke made in narrower by-product coke ovens (as compared to wider ovens) is
A Less reactive
B Stronger
C Smaller in size
D All of the above
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
A Density
B Porosity
C Electrical resistivity
D None of these
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
Narrow coke ovens as compared to wider coke ovens
A Produce smaller coke
B Produce stronger coke
C Require less time of carbonisation
D All of the above
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

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