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

Related Mcqs:

1. Coke made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?

   A. Less reactive
   B. Stronger
   C. Smaller in size
   D. All A., B. & C.

2. Narrow coke ovens as compared to wider coke ovens_________________?

   A. Produce smaller coke
   B. Produce stronger coke
   C. Require less time of carbonisation
   D. All A., B. and C.

3. 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

4. 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.

5. Undercharging of coal in the by-product coke ovens results in ____________________?

   A. Decrease in the c.v. of coke oven gas
   B. Increase in its throughput
   C. Increase in the c.v. of coke oven gas
   D. No change in the c.v. of coke oven gas

6. Flue gas from the heating chamber of by product coke ovens is removed by________________?

   A. Forced draft fan
   B. Induced draft fan
   C. Steam ejector
   D. Natural draft

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

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

8. Coking time in beehive coke oven is about ___________________?

   A. 12 hours
   B. 2-3 days
   C. One week
   D. Two weeks

9. 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

10. Compound coke ovens are those which can be heated by __________________?

    A. Both steam and electrical power
    B. Lean gas (e.g., B.F. gas)
    C. Rich gas (e.g., coke oven gas)
    D. Both B. and C.