Higher percentage of ash in coal meant for the production of metallurgical grade coke ___________________?

Related Mcqs:

1. 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

2. Caking index of the coal blend used for the manufacture of metallurgical coke should be around__________________?

   A. 5
   B. 21
   C. 40
   D. 48

3. Quantity of coke produced from metallurgical coal may be around _____________ percent?

   A. 30
   B. 50
   C. 75
   D. 95

4. Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than _______________ °C is liable to form clinker?

   A. 1100
   B. 1250
   C. 1350
   D. 1400

5. Desirable “Micum Index” values of metallurgical coke are ___________________?

   A. M40 > 78% and M10 < 10%
   B. M40 > 4% and M10 10% and M10 98% and M10 < 2%

6. Which of the following coke has the least percentage of ash ?

   A. Petroleum coke
   B. Beehive coke
   C. Foundry coke
   D. Metallurgical coke

7. Softening temperature of coal ash is a measure of the _____________ of coal?

   A. Caking tendency
   B. Coking tendency
   C. Clinkering tendency
   D. Size stability

8. Gas yield in the Kopper-Totzek coal gasifier is about ______________ Nm3/ton coal (ash = 35%)?

   A. 150
   B. 1500
   C. 3500
   D. 5000

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

   A. Colour
   B. Moisture content
   C. Ash content
   D. Volatile matter

10. 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