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Fuels and Combustion

Fuels and Combustion
Coal containing large quantity of __________ are difficult to wash.

Inherent mineral matter
Free impurities
Ash
Volatile matter

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Fuels and Combustion
Function of secondary air in pulverised coal firing is to

Dry the coal
Ensure efficient burning of coal around the burner
Reduce primary air requirement
Transport the coal to the burner

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Fuels and Combustion
Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter.

Bomb
Boy's
Junkar's
None of these

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Fuels and Combustion
Number of macrocomponents present in coal according to Stopes are

Six
Two
Five
Four

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Fuels and Combustion
Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent.

15 & 8
3 & 10
10 & 3
10 & 20

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Fuels and Combustion
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

Same
Less
Data insufficient; can't be predicted
More

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