Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

Fuels and Combustion
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

105

85

70

145

105

85

70

145

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Fuels and Combustion
With increase in C/H ratio of a fuel, the dew point of flue gases

Decreases

Remains same

May increase or decrease ; depends on the type of fuel

Increases

Decreases

Remains same

May increase or decrease ; depends on the type of fuel

Increases

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Fuels and Combustion
Natural draught produced by a chimney depends upon the

Density of the chimney gases

Height of the chimney

Both A & B

Neither A nor B

Density of the chimney gases

Height of the chimney

Both A & B

Neither A nor B

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Fuels and Combustion
Shatter index of the coke is a measure of its

Bulk density

Strength

None of these

Reactivity

Bulk density

Strength

None of these

Reactivity

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Fuels and Combustion
Combustion of pulverised fuel

Suppresses the discharge of fine dust and grit into atmosphere

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel

Requires larger combustion chamber than rich gaseous fuel

All of these

Suppresses the discharge of fine dust and grit into atmosphere

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel

Requires larger combustion chamber than rich gaseous fuel

All of these

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Fuels and Combustion
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.

4

2

1

6

4

2

1

6

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Fuels and Combustion

Fuels and Combustion Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

Fuels and Combustion With increase in C/H ratio of a fuel, the dew point of flue gases

Fuels and Combustion Natural draught produced by a chimney depends upon the

Fuels and Combustion Shatter index of the coke is a measure of its

Fuels and Combustion Combustion of pulverised fuel

Fuels and Combustion Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.

Fuels and Combustion
Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.

Fuels and Combustion
With increase in C/H ratio of a fuel, the dew point of flue gases

Fuels and Combustion
Natural draught produced by a chimney depends upon the

Fuels and Combustion
Shatter index of the coke is a measure of its

Fuels and Combustion
Combustion of pulverised fuel

Fuels and Combustion
Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.