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Fuels and Combustion

Fuels and Combustion
A good coking coal should have high __________ content.

Moisture
None of these
Ash
Sulphur & phosphorus

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Fuels and Combustion
Calorific value of a typical dry anthracite coal may be around __________ Kcal/kg.

1000
15000
8000
4000

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Fuels and Combustion
Critical Air Blast (CAB) value of coke is a direct measure of its

Strength
None of these
Hardness
Reactivity

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Fuels and Combustion
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Flame temperature achieved
Calorific value of the fuel
Speed of combustion of fuel
Heat transfer rate to the stock in the furnace

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Fuels and Combustion
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of

Pitch
Fuel oil
Bituminous coal
Blast furnace gas

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Fuels and Combustion
Hard pitch is used for making

Perfumes
Plastics
Pulverised fuel
Insecticides

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