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 less liable to spontaneous combustion on storage

Is more difficult to ignite and produces a shorter flame

Requires smaller combustion space and less secondary air

None of these

Is less liable to spontaneous combustion on storage

Is more difficult to ignite and produces a shorter flame

Requires smaller combustion space and less secondary air

None of these

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Fuels and Combustion
Which of the following accentuates clinker-ing trouble on furnace grate burning coal?

All of these

Low reactivity of carbonised residue containing high proportions of iron & sulphur

Low forced draught and fuel bed temperature

Thick fire bed and preheated primary air

All of these

Low reactivity of carbonised residue containing high proportions of iron & sulphur

Low forced draught and fuel bed temperature

Thick fire bed and preheated primary air

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Fuels and Combustion
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be

42.9

47.3

27.6

23

42.9

47.3

27.6

23

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Fuels and Combustion
During combustion of gaseous fuels, deficiency of air

Lengthens the flame

Does not affect the flame length

Tends to shorten the flame

Increases the flame temperature

Lengthens the flame

Does not affect the flame length

Tends to shorten the flame

Increases the flame temperature

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Fuels and Combustion
'Wobbe index' is a characteristic of

Gaseous fuels

Liquid fuels

Solid fuels

Fat coals

Gaseous fuels

Liquid fuels

Solid fuels

Fat coals

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Fuels and Combustion
The main drawback of supplying more excess air in the combustion of fuel is the

Intermittant and uncontrolled combustion of the fuel

Excessive power requirement of air blower

Enhanced sensible heat loss in the flue gas

High exit flue gas temperature from the furnace

Intermittant and uncontrolled combustion of the fuel

Excessive power requirement of air blower

Enhanced sensible heat loss in the flue gas

High exit flue gas temperature from the furnace

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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 Which of the following accentuates clinker-ing trouble on furnace grate burning coal?

Fuels and Combustion The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be

Fuels and Combustion During combustion of gaseous fuels, deficiency of air

Fuels and Combustion 'Wobbe index' is a characteristic of

Fuels and Combustion The main drawback of supplying more excess air in the combustion of fuel is the

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
Which of the following accentuates clinker-ing trouble on furnace grate burning coal?

Fuels and Combustion
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be

Fuels and Combustion
During combustion of gaseous fuels, deficiency of air

Fuels and Combustion
'Wobbe index' is a characteristic of

Fuels and Combustion
The main drawback of supplying more excess air in the combustion of fuel is the