Which of the following petrographic constituents of coal is non-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. Volatile matter content in coking coal may be about _____________ percent?

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

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

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

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

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

7. 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

8. 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

9. Which of the following constituents of coal is the most important in the production of coke ?

   A. Moisture
   B. Ash
   C. Volatiles
   D. Carbon

10. Which of the following is coking ?

    A. Vitrain
    B. Fussain
    C. Both A. & B.
    D. Neither A. nor B.