A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

Fuels and Combustion
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

5 to 15

1 to 2

3 to 4

20 to 40

5 to 15

1 to 2

3 to 4

20 to 40

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Fuels and Combustion
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

< 37%

None of these

In between 37 & 71%

>71%

< 37%

None of these

In between 37 & 71%

>71%

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

60

10

25

45

60

10

25

45

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Fuels and Combustion
The maximum adiabatic flame temperature is attained, when the fuel is burnt with

More than theoretically required amount of air

Theoretically required amount of air

Theoretically required amount of oxygen

Less than theoretically required amount of air

More than theoretically required amount of air

Theoretically required amount of air

Theoretically required amount of oxygen

Less than theoretically required amount of air

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Fuels and Combustion
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

It reduces its calorific value tremendously

It reduces its flame temperature tremendously

There are chances of explosion during preheating

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

It reduces its calorific value tremendously

It reduces its flame temperature tremendously

There are chances of explosion during preheating

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

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Fuels and Combustion
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be

29

77

79

21

29

77

79

21

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Fuels and Combustion

Fuels and Combustion A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

Fuels and Combustion Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

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

Fuels and Combustion The maximum adiabatic flame temperature is attained, when the fuel is burnt with

Fuels and Combustion Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

Fuels and Combustion The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be

Fuels and Combustion
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

Fuels and Combustion
Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent.

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

Fuels and Combustion
The maximum adiabatic flame temperature is attained, when the fuel is burnt with

Fuels and Combustion
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

Fuels and Combustion
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be