A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Lower carbon dioxide content

Higher methane content and thus higher calorific value

None of these

Higher carbon monoxide content

Lower carbon dioxide content

Higher methane content and thus higher calorific value

None of these

Higher carbon monoxide content

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Fuels and Combustion
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

Erosion of induced draft fan blades

Excessive fly-ash discharge from the stack

High power consumption in its transportation

Ash disposal problem

Erosion of induced draft fan blades

Excessive fly-ash discharge from the stack

High power consumption in its transportation

Ash disposal problem

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Fuels and Combustion
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

550

950

750

1150

550

950

750

1150

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Fuels and Combustion
Cannel coal

All of these

Is non-coking

Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named

Has a high volatile matter content and burns with a luminous smoky flame

All of these

Is non-coking

Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named

Has a high volatile matter content and burns with a luminous smoky flame

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Fuels and Combustion
One kg of carbon for theoretically complete combustion requires __________ kg of air.

11.5

23

12

0.5

11.5

23

12

0.5

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

Increase in its strength

Decrease in its calorific value

None of these

Brittleness of steel made by using it

Increase in its strength

Decrease in its calorific value

None of these

Brittleness of steel made by using it

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Fuels and Combustion

Fuels and Combustion A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Fuels and Combustion Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

Fuels and Combustion Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

Fuels and Combustion Cannel coal

Fuels and Combustion One kg of carbon for theoretically complete combustion requires __________ kg of air.

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

Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Fuels and Combustion
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

Fuels and Combustion
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

Fuels and Combustion
Cannel coal

Fuels and Combustion
One kg of carbon for theoretically complete combustion requires __________ kg of air.

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