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

Related Mcqs:

1. Spontaneous combustion of coal on storage results due to___________________?

   A. Inadequate ventilation
   B. Low temperature oxidation
   C. Storage in large heaps with small surface to volume ratio
   D. All A., B. and C.

2. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in___________________?

   A. Shallow and small piles
   B. Fine sizes without the presence of any lump
   C. Closed space without any ventilation facility
   D. Large heaps with small surface to volume ratio

3. Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if __________________?

   A. It contains large amount of volatile matter
   B. It is stored in tall heaps
   C. Smaller fines are stored in large quantity
   D. All A., B. and C.

4. 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.

5. 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

6. Safe condition for storage of high V.M. bituminous coal is that ___________________?

   A. Height of the coal heap should be < 3 metres
   B. Maximum 200 tons should be stored in a heap
   C. Both A. and B.
   D. Neither A. nor B.

7. Washing of coal decreases its_________________?

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

8. 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

9. Use of excess of combustion air in the combustion of fuels results in__________________?

   A. Heat losses
   B. Long flame
   C. Condensation of water vapour from the fuel gas
   D. None of these

10. Deficiency of combustion air during combustion of a gaseous fuel_____________________?

    A. Lengthens the flame
    B. Causes heat loss of fuel by its partial combustion
    C. Both A. & B.
    D. Shortens the flame