Which of the following is coking ?

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

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

3. Very ______________ coals are completely devoid of cokability i.e., it is non-coking ?

   A. Young
   B. Mature
   C. Both A & B
   D. Neither A nor B

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

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

5. Coking coals are invariably____________________?

   A. Lignites
   B. Bituminous coals
   C. Semi-anthracites
   D. Anthracites

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

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

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

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

8. 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

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

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

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

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