Related Questions

Caking index of the coal blend used for the manufacture of metallurgical coke should be around
A 5
B 21
C 40
D 48
Two types of tea, Sreemangal Red costing Tk. 50 per kg and Sreemangal Black costing Tk. 70 per kg, are mixed together to form a new blend of tea. If the new blend costs Tk. 58 per kg, how much of Sreemangal Red is required to make 10 kgs of the new blend?
A 6
B 5
C 7
D 4
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
Abrasion index of blast furnace coke should be around __________ percent.
A 20
B 35
C 80
D 55
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
Caking index of a coal is a measure of its
A Abradability
B Reactivity
C Agglutinating (binding) properties
D Porosity
Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
A 20
B 40
C 60
D 80
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

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