As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

Fuels and Combustion
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

Decreases

May increase or decrease depending on the type of fuel

Remains same

Increases

Decreases

May increase or decrease depending on the type of fuel

Remains same

Increases

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

Large heaps with small surface to volume ratio

Shallow and small piles

Fine sizes without the presence of any lump

Closed space without any ventilation facility

Large heaps with small surface to volume ratio

Shallow and small piles

Fine sizes without the presence of any lump

Closed space without any ventilation facility

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Fuels and Combustion
Use of preheated air for combustion of fuel in the furnace, increases the

None of these

Calorific value of the fuel

Flame temperature

Scale losses of the furnace stock

None of these

Calorific value of the fuel

Flame temperature

Scale losses of the furnace stock

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Fuels and Combustion
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

96

40

20

4

96

40

20

4

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Fuels and Combustion
Percentage of hydrogen in coke oven gas may be around

45

60

25

10

45

60

25

10

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Fuels and Combustion
A coal with high ash content is undesirable, as

All of these

The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the

It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes

All of these

The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the

It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes

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Fuels and Combustion

Fuels and Combustion As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

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

Fuels and Combustion Use of preheated air for combustion of fuel in the furnace, increases the

Fuels and Combustion Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

Fuels and Combustion Percentage of hydrogen in coke oven gas may be around

Fuels and Combustion A coal with high ash content is undesirable, as

Fuels and Combustion
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

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

Fuels and Combustion
Use of preheated air for combustion of fuel in the furnace, increases the

Fuels and Combustion
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

Fuels and Combustion
Percentage of hydrogen in coke oven gas may be around

Fuels and Combustion
A coal with high ash content is undesirable, as