Low temperature oxidation of coal is accelerated by the

Fuels and Combustion
Low temperature oxidation of coal is accelerated by the

Absence of porous or friable particles

All of these

Storage in large heaps

Storage in compressed piles

Absence of porous or friable particles

All of these

Storage in large heaps

Storage in compressed piles

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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

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

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

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

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

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

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Fuels and Combustion
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.

None of these

Sensible

Latent

Sensible and latent

None of these

Sensible

Latent

Sensible and latent

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Fuels and Combustion
__________ present in coal is not determined in its ultimate analysis.

Hydrogen

Nitrogen

Total carbon

Fixed carbon

Hydrogen

Nitrogen

Total carbon

Fixed carbon

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Fuels and Combustion
Benzene is used

As a motor fuel

As a perfume

As an explosive

For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)

As a motor fuel

As a perfume

As an explosive

For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)

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Fuels and Combustion
Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use.

15-30

43832

70-100

150-200

15-30

43832

70-100

150-200

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Fuels and Combustion

Fuels and Combustion Low temperature oxidation of coal is accelerated by the

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

Fuels and Combustion Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.

Fuels and Combustion __________ present in coal is not determined in its ultimate analysis.

Fuels and Combustion Benzene is used

Fuels and Combustion Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use.

Fuels and Combustion
Low temperature oxidation of coal is accelerated by the

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

Fuels and Combustion
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.

Fuels and Combustion
__________ present in coal is not determined in its ultimate analysis.

Fuels and Combustion
Benzene is used

Fuels and Combustion
Dust content in raw blast furnace gas is about __________ gm/Nm³ , hence it is cleaned to the dust level of about < 10 mg /Nm³ before use.