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Fuels and Combustion

Fuels and Combustion
'Fuel' can be defined as a substance which produces heat by

Nuclear fusion
Nuclear fission
Combustion
All of these

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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
Ifits carbon content is very low
If its ash content is zero

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Fuels and Combustion
Combustion of pulverised coal compared to the lumpy coal

Facilitates combustion with lower excess air
Provides better control of furnace temperature
All of these
Provides higher thermal efficiency & flame temperature

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Fuels and Combustion
Caking coal is desirable for

Burning on travelling grate
All of these
Coke making
Burning on firebars

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Fuels and Combustion
Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm³/ton coal (ash = 35%).

150
1500
5000
3500

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Fuels and Combustion
Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant?

Ammonium phosphate
None of these
Ammonium sulphate
Ammonium nitrate

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