Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

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

Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

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