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Fuels and Combustion

Fuels and Combustion
C/H ratio is the maximum in case of

Natural gas
Furnace oil
Coal
Naphtha

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Fuels and Combustion
Which of the following accentuates clinker-ing trouble on furnace grate burning coal?

All of these
Low forced draught and fuel bed temperature
Thick fire bed and preheated primary air
Low reactivity of carbonised residue containing high proportions of iron & sulphur

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Fuels and Combustion
High amount of sulphur and phosphorous in coke causes

Brittleness of steel made by using it
Decrease in its calorific value
Increase in its strength
None of these

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Fuels and Combustion
Soft coke is not

None of these
Used in blast furnaces
Produced by low temperature carbonisation of coal
A domestic fuel

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Fuels and Combustion
Turndown ratio of a gas burner is equal to the

Both A & B
Maximum to minimum permissible gas flow rate
Minimum to maximum heat input ratio
Maximum to minimum heat input ratio

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Fuels and Combustion
Cannel coal and boghead coal are the examples of

Sapropelic coals
Liptobiolites
Humic coals
None of these

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