The weathering index of a coal________________?

Related Mcqs:

1. Washing of coal________________?

   A. Reduces its sulphur and ash content
   B. Controls its ash fusibility and increases its calorific value
   C. Improves its coking properties
   D. All A., B. and C.

2. Weathering of coal during storage causes_______________?

   A. Reduction in coal size
   B. Increase in its friability
   C. Decrease in its caking capacity
   D. All A., B. and C.

3. Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?

   A. Caking index
   B. Yield of carbonised products
   C. Friability & oxygen content
   D. Calorific value

4. Caking index of a coal is a measure of its _______________________?

   A. Abradability
   B. Reactivity
   C. Agglutinating (binding) properties
   D. Porosity

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

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

6. “Micum Index” of a coke is a measure of its___________________?

   A. Reactivity
   B. Porosity
   C. Bulk density
   D. Hardness & strength

7. Abrasion index of blast furnace coke should be around _____________ percent?

   A. 20
   B. 35
   C. 55
   D. 80

8. Hardgrove Grindability index of four coal samples are given below. Which of them is the easiest to grind ?

   A. 50
   B. 70
   C. 85
   D. 100

9. Shatter index of the coke is a measure of its___________________?

   A. Strength
   B. Bulk density
   C. Reactivity

   D. None of these

10. Gray King Assay and Swelling Index of a coal is a measure of its ____________________?

    A. Swelling characteristics
    B. Abradability
    C. Agglutinating properties
    D. Resistance to impact breakage