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Fuels and Combustion

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

23
42.9
27.6
47.3

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Fuels and Combustion
Efficient burning of anthracite coal requires

High excess air
All of these
Fine grinding
Low preheat of air

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Fuels and Combustion
With increase in C/H ratio of a fuel, the dew point of flue gases

Remains same
Increases
May increase or decrease ; depends on the type of fuel
Decreases

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Fuels and Combustion
Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ?

Carburetted water gas
Producers
Natural gas
Blast furnace gas

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Fuels and Combustion
Coal tar fuel - 200 (CTF 200) is a mixture of

Anthracene and crecosote oil
Solar oil and pitch
Pitch and creosote oil
Light oil and pitch

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Fuels and Combustion
Height of coke oven is limited (say maximum upto 7 metres) mainly by the

Problem of uniform heating along its height
Buckling of ram of pusher car at the time of coke pushing
Problem in door cleaning
Structural strength of silica bricks

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