A. 5
B. 21
C. 40
D. 48
Related Mcqs:
- Caking index of coal blend used for blast furnace coke making is about_________________?
A. 8
B. 12
C. 22
D. 36 - Quantity of coke produced from metallurgical coal may be around _____________ percent?
A. 30
B. 50
C. 75
D. 95 - 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 - Desirable “Micum Index” values of metallurgical coke are ___________________?
A. M40 > 78% and M10 < 10%
B. M40 > 4% and M10 10% and M10 98% and M10 < 2% - Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around _______________ percent?
A. 80 and 97
B. 95 and 100
C. 40 and 70
D. 25 and 97 - Caking index of a coal is a measure of its _______________________?
A. Abradability
B. Reactivity
C. Agglutinating (binding) properties
D. Porosity - 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 - Volatile matter content of metallurgical coke may be around ______________ percent?
A. 1-2
B. 10-15
C. 22-26
D. 30-33 - A good metallurgical coke should have very low__________________?
A. Sulphur & phosphorous content
B. Porosity
C. Fusion point of its ash
D. Hardness & strength
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