Related Questions

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 of the above
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
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
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
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
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
Low temperature oxidation of coal during storage does not decrease its
A Oxygen content
B Caking power
C Calorific value
D None of these
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
Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to
A Cylinder walls being too hot
B Overheated spark plug points
C Red hot carbon deposits on cylinder walls
D Any one of these
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

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