Washing of coal is done to reduce the_________________?

Related Mcqs:

1. Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?

   A. 1000
   B. 4000
   C. 6000
   D. 8000

2. Washing of coal does not reduce its______________________?

   A. S & P content
   B. Heating value
   C. Fusion point of ash
   D. None of these

3. The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ____________________?

   A. Carbon tetrachloride
   B. Sand (40%)
   C. Mineral oil of high viscosity & specific gravity (1.6)
   D. None of these

4. Washing of coal decreases its_________________?

   A. Caking index
   B. Mineral matter content
   C. Ash content
   D. Both B. and C.

5. Washing of coal _________________?

   A. Reduces its ash & sulphur content
   B. Improves its coking properties
   C. Increase the fusion point of its ash by removing chlorine compounds
   D. All A., B. and C.

6. Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the ________________ of coal?

   A. Hydrogenation
   B. Gasification
   C. Carbonisation
   D. None of these

7. Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an ______________ bed gasifier?

   A. Entrained
   B. Moving
   C. Fixed
   D. Fluidised

8. (64-132) rank coal (ASTM) means a coal with 64%___________________?

   A. Fixed carbon and having a heat value of 13, 200 BTU/1b
   B. Ash and a heating value of 13, 200 BTU/1b
   C. Fixed carbon and a heating value of 132 BTU/1b
   D. None of these

9. 64-132) rank coal (ASTM) means a coal with 64%___________________?

   A. Fixed carbon and having a heating value around 13, 200 BTU/1b
   B. Ash and heating value around 13, 200 BTU/1b
   C. Fixed carbon and heating value around 132 BTU/1b
   D. None of these

10. 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.