Related Questions

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
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
A friability & oxygen content
B caking index
C yield of carbonized products
D calorific value
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 of the above
The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.
A Fast & high
B Slow & low
C Slow & high
D Fast & slow
Green house effect is accentuated by
A Deforestation
B Rapid industrialisation
C Increased transportation activity
D All of the above
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is
A [

A.

B.

B > 7
C > 20
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
Low temperature oxidation of coal is accelerated by the
A Storage in large heaps
B Storage in compressed piles
C Absence of porous or friable particles
D All of the above
Low temperature oxidation of stored coal results in the
A Decrease in its caking power & calorific value
B Decrease in its carbon & hydrogen content
C Increase in its oxygen content
D All of the above
Low temperature oxidation of coal during storage does not decrease its
A Oxygen content
B Caking power
C Calorific value
D None of these

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