A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Fuels and Combustion
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

High sulphur content in the fuel

Presence of large quantity of hydrogen in the fuel

Low calorific value of the fuel

Lack of thorough mixing of fuel with air

High sulphur content in the fuel

Presence of large quantity of hydrogen in the fuel

Low calorific value of the fuel

Lack of thorough mixing of fuel with air

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Fuels and Combustion
The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.

Slow & low

Fast & slow

Fast & high

Slow & high

Slow & low

Fast & slow

Fast & high

Slow & high

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Fuels and Combustion
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

950

750

1100

500

950

750

1100

500

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Fuels and Combustion
C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.

Remains constant

Increases

May increase or decrease, depends on combustibles

Decreases

Remains constant

Increases

May increase or decrease, depends on combustibles

Decreases

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Fuels and Combustion
Atomising steam to fuel oil ratio in a burner should be around

2.5

3.5

1.5

0.5

2.5

3.5

1.5

0.5

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Fuels and Combustion
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.

Ignition temperature

Sulphur content

Calorific value

Type (solid, liquid or gaseous)

Ignition temperature

Sulphur content

Calorific value

Type (solid, liquid or gaseous)

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Fuels and Combustion

Fuels and Combustion A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Fuels and Combustion The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.

Fuels and Combustion Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

Fuels and Combustion C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.

Fuels and Combustion Atomising steam to fuel oil ratio in a burner should be around

Fuels and Combustion The optimum percentage of excess air for combustion depends upon the __________ of the fuel.

Fuels and Combustion
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Fuels and Combustion
The bright glow of a combustion process is the characteristic of __________ temperature oxidation of coal.

Fuels and Combustion
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

Fuels and Combustion
C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.

Fuels and Combustion
Atomising steam to fuel oil ratio in a burner should be around

Fuels and Combustion
The optimum percentage of excess air for combustion depends upon the __________ of the fuel.