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Fuels and Combustion

Fuels and Combustion
Number of macrocomponents present in coal according to Stopes are

Six
Two
Five
Four

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Fuels and Combustion
A coal having higher volatile matter content will necessarily have lower

Ash fusion temperature
Calorific value
Caking index
Ignition temperature

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Fuels and Combustion
Which of the following constituents of coal is the most important in the production of coke?

Volatiles
Carbon
Ash
Moisture

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Fuels and Combustion
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

105
145
85
70

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Fuels and Combustion
The main function of primary air in pulverised coal fired burner is to

Burn CO to CO₂
Have proper combustion by supplying it around the burner
Preheat the tertiary air used for complete combustion of CO to CO₂
Dry and transport the coal

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Fuels and Combustion
Low temperature oxidation of stored coal results in the

Decrease in its caking power & calorific value
All of these
Increase in its oxygen content
Decrease in its carbon & hydrogen content

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