Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Fuels and Combustion
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Speed of combustion of fuel

Heat transfer rate to the stock in the furnace

Calorific value of the fuel

Flame temperature achieved

Speed of combustion of fuel

Heat transfer rate to the stock in the furnace

Calorific value of the fuel

Flame temperature achieved

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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

Closed space without any ventilation facility

Fine sizes without the presence of any lump

Large heaps with small surface to volume ratio

Shallow and small piles

Closed space without any ventilation facility

Fine sizes without the presence of any lump

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Fuels and Combustion
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

Data insufficient; can't be predicted

More

Less

Same

Data insufficient; can't be predicted

More

Less

Same

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Fuels and Combustion
The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

Either lower or higher, depends on the type of fuel

Much higher

Same

Much lower

Either lower or higher, depends on the type of fuel

Much higher

Same

Much lower

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

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

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

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

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

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

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

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Fuels and Combustion
The weathering index of a coal

Gives an idea of the fusion temperature of ash

Is a measure of its caking tendency

Is related to its calorific value

Is a measure of its size stability, when stored & exposed to weather

Gives an idea of the fusion temperature of ash

Is a measure of its caking tendency

Is related to its calorific value

Is a measure of its size stability, when stored & exposed to weather

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Fuels and Combustion

Fuels and Combustion Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

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 A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

Fuels and Combustion The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

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

Fuels and Combustion The weathering index of a coal

Fuels and Combustion
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

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
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

Fuels and Combustion
The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

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

Fuels and Combustion
The weathering index of a coal