A good coking coal should have high ______________ content?

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. Coking time in a commercial high temperature coal carbonisation plant is about ______________ hours?

   A. 6
   B. 18
   C. 28
   D. 36

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

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

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

   A. 6
   B. 12
   C. 18
   D. 24

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

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

6. Which of the following petrographic constituents of coal is non-coking ?

   A. Vitrain
   B. Clarain
   C. Durain
   D. Fussain

7. A coal containing very high percentage of durain is called ______________ coal?

   A. Bright
   B. Splint
   C. Non-banded
   D. Boghead

8. 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

9. 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

10. Coking time in narrow by-product coke ovens is around ______________ hours?

    A. 18
    B. 48
    C. 8
    D. 80