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Fuels and Combustion

Fuels and Combustion
Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.

60
500
160
750

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Fuels and Combustion
Ignition temperature of a fuel in air is __________ that in pure oxygen.

More than
Either more or less; depends on the type of fuel
Less than
Equal to

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Fuels and Combustion
'Wobbe index' is a characteristic of

Gaseous fuels
Fat coals
Liquid fuels
Solid fuels

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Fuels and Combustion
Safe condition for storage of high V.M. bituminous coal is that

Maximum 200 tons should be stored in a heap
Neither A nor B
Both A and B
Height of the coal heap should be < 3 metres

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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
70
85

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Fuels and Combustion
Gross and net calorific value of a fuel will be the same

Under no circumstances
If its hydrogen/hydrogen compound content is zero
If its ash content is zero
Ifits carbon content is very low

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