A good quality coal should have ___________________?

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. ‘Fat’ coal means a coal having ___________________?

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

3. (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

4. 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

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

   A. Proximate analysis
   B. Ultimate analysis
   C. Caking index
   D. Calorific value

6. Cannel coal and boghead coal are the examples of _________________?

   A. Humic coals
   B. Liptobiolites
   C. Sapropelic coals
   D. None of these

7. 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.

8. 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.

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