Ash content in the coke produced from a coking coal having 20% ash may be around _____________ percent?

Related Mcqs:

1. Prime coking coal is always blended with medium or non- coking coal before carbonisation__________________?

   A. To check against its excessive swelling during heating, which may exert high pressure and
   damage coke oven walls
   B. Because, it alone produces unreactive coke
   C. Both A. and B.
   D. Neither A. nor B.

2. Volatile matter content in coking coal may be about _____________ percent?

   A. 1
   B. 7
   C. 22
   D. 46

3. During coking of coal, the ash content (percentage)________________?

   A. Increases
   B. Decreases
   C. Remain constant
   D. None of these

4. Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than _______________ °C is liable to form clinker?

   A. 1100
   B. 1250
   C. 1350
   D. 1400

5. Quantity of coke produced from metallurgical coal may be around _____________ percent?

   A. 30
   B. 50
   C. 75
   D. 95

6. Mineral matter content (M) and ash content A. in coal are approximately related as _______________?

   A. M = 1.1A
   B. M = A
   C. M = 1.5A
   D. M = 2A

7. 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

8. A good coking coal should have high ______________ content?

   A. Ash
   B. Sulphur & phosphorus
   C. Moisture
   D. None of these

9. Softening temperature of coal ash is a measure of the _____________ of coal?

   A. Caking tendency
   B. Coking tendency
   C. Clinkering tendency
   D. Size stability

10. 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