A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

Fuels and Combustion
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

Is more difficult to ignite and produces a shorter flame

Is less liable to spontaneous combustion on storage

None of these

Requires smaller combustion space and less secondary air

Is more difficult to ignite and produces a shorter flame

Is less liable to spontaneous combustion on storage

None of these

Requires smaller combustion space and less secondary air

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Fuels and Combustion
Ratio of primary air to secondary air increases with increase in the rank of coal, because the

High rank coals have higher amount of volatile matter

Ratio of fixed carbon to volatile matter increases

Oxygen content progressively decreases

Calorific value of the coal increases

High rank coals have higher amount of volatile matter

Ratio of fixed carbon to volatile matter increases

Oxygen content progressively decreases

Calorific value of the coal increases

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Fuels and Combustion
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its

Emissivity factor is higher

All of these

Flue gas has lower dew point thereby facilitating more waste heat recovery

Sulphur content is lower

Emissivity factor is higher

All of these

Flue gas has lower dew point thereby facilitating more waste heat recovery

Sulphur content is lower

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Fuels and Combustion
Main constituent of natural gas is

C₃H₈

CH₄ (upto 90%)

C₂H₆

H₂

C₃H₈

CH₄ (upto 90%)

C₂H₆

H₂

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Fuels and Combustion
The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be

Y

0.95 y

1.05 y

1.8 y

Y

0.95 y

1.05 y

1.8 y

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Fuels and Combustion
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.

6

1

4

2

6

1

4

2

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Fuels and Combustion

Fuels and Combustion A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

Fuels and Combustion Ratio of primary air to secondary air increases with increase in the rank of coal, because the

Fuels and Combustion Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its

Fuels and Combustion Main constituent of natural gas is

Fuels and Combustion The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be

Fuels and Combustion Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.

Fuels and Combustion
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

Fuels and Combustion
Ratio of primary air to secondary air increases with increase in the rank of coal, because the

Fuels and Combustion
Pitch creosote mixture (PCM) as compared to furnace oil is a better fuel, because its

Fuels and Combustion
Main constituent of natural gas is

Fuels and Combustion
The calorific value of a gas of composition CO₂ = 20%, H₂ = 50%, CH₄ = 30%, is y. If the composition of gas is changed to H₂ = 50%, CH₄ = 30%, CO₂ = 10%, N₂ = 10%, then the calorifice value will be

Fuels and Combustion
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.