Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.

Furnace Technology
Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.

20

5

40

60

20

5

40

60

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Furnace Technology
Presence of SO₂ in furnace gases attacks the ferrous metal by way of

Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature

All of these

Accelerating the rate of scaling

Causing metal embrittlement

Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature

All of these

Accelerating the rate of scaling

Causing metal embrittlement

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Furnace Technology
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.

750

1250

350

1050

750

1250

350

1050

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Furnace Technology
If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.

Rotary

Diffusion

Outside mixing type

Premix

Rotary

Diffusion

Outside mixing type

Premix

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Furnace Technology
Tunnel kilns are usually used for

Drying/tempering of refractories

Roasting of pyrites

Melting of glass

Reheating of slabs

Drying/tempering of refractories

Roasting of pyrites

Melting of glass

Reheating of slabs

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Furnace Technology
Specific heating capacity of a furnace is expressed as

Weight heated/furnace volume

Weight heated/hr

None of these

Weight heated/hr/furnace volume

Weight heated/furnace volume

Weight heated/hr

None of these

Weight heated/hr/furnace volume

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Furnace Technology

Furnace Technology Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.

Furnace Technology Presence of SO₂ in furnace gases attacks the ferrous metal by way of

Furnace Technology Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.

Furnace Technology If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.

Furnace Technology Tunnel kilns are usually used for

Furnace Technology Specific heating capacity of a furnace is expressed as

Furnace Technology
Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.

Furnace Technology
Presence of SO₂ in furnace gases attacks the ferrous metal by way of

Furnace Technology
Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.

Furnace Technology
If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.

Furnace Technology
Tunnel kilns are usually used for

Furnace Technology
Specific heating capacity of a furnace is expressed as