Degree of carbonisation of coal during coke making can be roughly judged by the ______________ of the coke produced?

Related Mcqs:

1. 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.

2. During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the _______________ of the mass?

   A. Density
   B. Porosity
   C. Electrical resistivity
   D. None of these

3. 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

4. Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around ______________ Nm3?

   A. 30
   B. 300
   C. 3,000
   D. 30,000

5. 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

6. Calorific value of coke even gas produced by low temperature carbonisation of coal is about ____________ Kcal/Nm3?

   A. 4000
   B. 2500
   C. 6500
   D. 10000

7. Heat penetration rate in narrow coke ovens in high temperature carbonisation of coal is around ______________ cm/hr?

   A. 2.5
   B. 0.5
   C. 10
   D. 20

8. 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

9. 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

10. Main use of hard coke produced by high temperature carbonisation is in the ____________________ ?

    A. Iron blast furnace
    B. Cupola in foundries
    C. Sinter making
    D. Domestic ovens