Very ______________ coals are completely devoid of cokability i.e., it 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. ‘Fat coals’ are those coals which have very high____________________?

   A. Caking capacity
   B. Volatile matter content
   C. Fusion point of its ash
   D. Inherent moisture content

3. Coking coals are invariably____________________?

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

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

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

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

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

6. Assam (India) coals suffers mainly from the disadvantage of high ______________ content?

   A. Ash
   B. Volatile matter
   C. Sulphur (4-6%)
   D. Moisture

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

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

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

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

9. Which of the following is coking ?

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

10. 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