Related Questions

Quantity of coke produced from metallurgical coal may be around __________ percent.
A 30
B 50
C 75
D 95
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon
A Is less liable to spontaneous combustion on storage
B Is more difficult to ignite and produces a shorter flame
C Requires smaller combustion space and less secondary air
D None of these
Volatile matter content in coking coal may be about __________ percent.
A 1
B 7
C 22
D 46
Caking index of the coal blend used for the manufacture of metallurgical coke should be around
A 5
B 21
C 40
D 48
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
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
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
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
Hydrogen content of coke oven gas is __________ percent.
A 4
B 22
C 58
D 84

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