A. Reduction in coal size
B. Increase in its friability
C. Decrease in its caking capacity
D. All A., B. and C.
Related Mcqs:
- 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 - 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 - Low temperature oxidation of coal during storage does not decrease its__________________?
A. Oxygen content
B. Caking power
C. Calorific value
D. None of these - ‘Wind loss’ resulting from unscientific storage of coal may be the order of about _____________ percent?
A. 2.5
B. 7.5
C. 10.5
D. 14.5 - Rate of low temperature oxidation of coal due to bad storage conditions_______________?
A. Decreases with increase in surface area
B. Does not vary with increase in surface area
C. Is more for low volatile coal compared to high volatile coal
D. Is accelerated by storage in large heaps with small surface to volume ratio - 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. - Low temperature oxidation of coal resulting from bad storage conditions does not decrease its______________________?
A. Caking power
B. Calorific value
C. Hydrogen content
D. Oxygen content - 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. - A coal containing very high percentage of durain is called ______________ coal?
A. Bright
B. Splint
C. Non-banded
D. Boghead - 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
