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

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. Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has_________________?

   A. Higher calorific value
   B. Lower hydrogen content
   C. Both A. and B.
   D. Neither A. nor B.

3. In high temperature carbonisation of coal compared to low temperature carbonisation ?

   A. Yield of ammonia is less
   B. Aromatic content of tar is low
   C. H2 content in the coke oven gas is more
   D. Calorific value of the coke oven gas is lower

4. In low temperature carbonisation of coal as compared to high temperature carbonisation _____________ produced is less?

   A. Difference in gross & net calorific value of the coke oven gas
   B. Free carbon content in tar
   C. Yield percentage of coke
   D. Yield of ammonia present in coke oven gas

5. In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the______________?

   A. Gas yield is less
   B. Tar yield is more
   C. Ignition temperature of coke produced is less
   D. Aromatic content of tar produced is more

6. In low temperature carbonisation (as compared to high temperature carbonisation) of coal__________________?

   A. Ammonia yield is more
   B. Aliphatic tar is produced
   C. Free carbon in tar is more
   D. All A., B. and C.

7. In high temperature carbonisation (as compared to low temperature carbonisation) of coal___________________?

   A. Coke oven gas yield is more
   B. Tar yield is less but free carbon in tar is more
   C. Calorific value of coke oven gas is less
   D. All A., B. and C.

8. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?

   A. 3 & 10
   B. 10 & 3
   C. 10 & 20
   D. 15 & 8

9. Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?

   A. 60
   B. 160
   C. 500
   D. 750

10. Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ?

    A. Benzol
    B. Pitch-creosote mixture (PCM)
    C. Naphthalene
    D. Ethylene