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Fuels and Combustion

Fuels and Combustion
Caking index of a coal is a measure of its

Porosity
Abradability
Agglutinating (binding) properties
Reactivity

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Fuels and Combustion
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.

15 to 25
55 to 75
35 to 45
75

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Fuels and Combustion
Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

%of CO₂ in
% of O₂in
Colour of
Temperature of

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Fuels and Combustion
Fusion point of coal ash increases with increase in its __________ content.

Iron silicate
Lime and magnesia
Iron sulphate
All of these

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Fuels and Combustion
If CO₂ is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as

SO₂
O₂
CO
N₂

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Fuels and Combustion
A good quality coal should have

Low fusion point of ash
None of these
High ash content
High sulphur

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