To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

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

To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

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