_____________ of the coal is the basis for Seylor’s coal classification?

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

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

3. ombustion of pulverised coal compared to the lumpy coal __________________?

   CA. Provides better control of furnace temperature
   B. Facilitates combustion with lower excess air
   C. Provides higher thermal efficiency & flame temperature
   D. All A., B. & C.

4. ‘Fat’ coal means a coal having ___________________?

   A. Low calorific value
   B. High volatile matter
   C. Low ash content
   D. Non smoking tendency

5. When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?

   A. Carbonisation
   B. Oxidation
   C. Coalification
   D. Gasification

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

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

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. 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. Combustion of pulverised coal as compared to that of lump coal ________________?

   A. Develops a non-luminous flame
   B. Develops a low temperature flame
   C. Can be done with less excess air
   D. Provides a lower rate of heat release

10. 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