With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

Fuels and Combustion
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

Methane

All of these

Unsaturated hydrocarbons

Hydrogen

Methane

All of these

Unsaturated hydrocarbons

Hydrogen

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Fuels and Combustion
Coke oven gas is a better fuel than blast furnace gas, because of its higher

Adiabatic flame temperature

All of these

Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

Heat release rate (thus requiring smaller combustion chamber)

Adiabatic flame temperature

All of these

Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

Heat release rate (thus requiring smaller combustion chamber)

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Fuels and Combustion
The fuel ratio of a coal is

Both A and B

Neither A nor B

Helpful in estimation of its rank

The ratio of its percentage of fixed carbon to that of volatile matter

Both A and B

Neither A nor B

Helpful in estimation of its rank

The ratio of its percentage of fixed carbon to that of volatile matter

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Fuels and Combustion
As time passes, the calorific value of stored coal

Decreases

Remains unaltered

Increases

May increase or decrease (depends on the method of storage)

Decreases

Remains unaltered

Increases

May increase or decrease (depends on the method of storage)

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Fuels and Combustion
Octane number of 2, 2, 4 - trimethyl pen-tane is

100

In between 0 and 100

More than 100

100

In between 0 and 100

More than 100

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

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

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

All of these

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

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

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

Fuels and Combustion With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

Fuels and Combustion Coke oven gas is a better fuel than blast furnace gas, because of its higher

Fuels and Combustion The fuel ratio of a coal is

Fuels and Combustion As time passes, the calorific value of stored coal

Fuels and Combustion Octane number of 2, 2, 4 - trimethyl pen-tane is

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

Fuels and Combustion
With increase in the time of carbonisation at a particular temperature (say 1000°C), the __________ percentage in coke oven gas increases.

Fuels and Combustion
Coke oven gas is a better fuel than blast furnace gas, because of its higher

Fuels and Combustion
The fuel ratio of a coal is

Fuels and Combustion
As time passes, the calorific value of stored coal

Fuels and Combustion
Octane number of 2, 2, 4 - trimethyl pen-tane is

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