Presence of free moisture in coal during its high temperature carbonisation
A. protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls
B. reduces the coking time
C. increases the loss of fine coal dust from the ovens when charging
D. none of these
Answer: Option A
This Question Belongs to Metallurgical Engineering >> Fuels, Furnace And Refractories Technology
How much is the percentage of fixed carbon in semi-anthracite?
A. 65 - 70%
B. 45 - 50%
C. 80 - 90%
D. 55 - 65%
How much is the percentage of fixed carbon in lignite?
A. Up to 30
B. Up to 60
C. Up to 90
D. Up to 80
How much is the calorific value of lignite coal?
A. 5000 kcal/kg
B. 8000 kcal/kg
C. 7000 kcal/kg
D. 9000 kcal/kg
How much is the calorific value of semi-anthracite coal?
A. 85 to 88 kcal/kg
B. 850 to 880 kcal/kg
C. 85000 to 88000 kcal/kg
D. 8500 to 8800 kcal/kg
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