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. 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

3. 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

4. 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.

5. 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.

6. 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

7. 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

8. A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon _________________?

   A. Is less liable to spontaneous combustion on storage
   B. Is more difficult to ignite and produces a shorter flame
   C. Requires smaller combustion space and less secondary air
   D. None of these

9. 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

10. In low temperature carbonisation of coal, the________________?

    A. Yield of coke oven gas is 290 Nm3 /ton dry coal
    B. Volatile matter in coke is zero
    C. Temperature maintained is 700°C
    D. Yield of tar is about 3% of dry coal