Related Questions

Volatile matter content of metallurgical coke may be around __________ percent.
A 1-2
B 10-15
C 22-26
D 30-33
Caking index of the coal blend used for the manufacture of metallurgical coke should be around
A 5
B 21
C 40
D 48
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
Higher percentage of ash in coal meant for the production of metallurgical grade coke
A Decreases the hardness of coke
B Decreases the abrasion resistance of coke
C Causes brittleness in steel
D None of these
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
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
A 1000
B 4000
C 6000
D 8000
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has
A Higher calorific value
B Lower hydrogen content
C Both A & B
D Neither A nor B
A good metallurgical coke
A Should have high porosity
B Should be brittle
C Must contain moderate quantities of ash, moisture, sulphur and volatile matters
D Should have low fusion point of its ash
A good metallurgical coke should have very low
A Sulphur & phosphorous content
B Porosity
C Fusion point of its ash
D Hardness & strength
Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around __________ cm/hr.
A 2.5
B 0.5
C 10
D 20

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