Related Questions

The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.
A 0.2
B 2
C 4
D 8
Pig iron is produced by blast furnaces in India using mostly the iron ore named
A Hematite
B Magnetite
C Siderite
D Chalcopyrite
Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight
A 1.5
B 3
C 5
D 7
Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.
A 2
B 3
C 0.8
D 6
Limestone is added in the blast furnace (during pig iron manufacture) to
A Form slag by combining with impurities
B Supply heat by undergoing exothermic reaction with impurities
C Reduce the coke consumption
D Reduce slag viscosity
Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
A 20
B 40
C 60
D 80
Pig iron is manufactured from the ores by
A Dressing
B Calcination and roasting
C Smelting
D All the above
Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as
A Bessemer pig
B Grey or foundry pig
C White or forge pig
D Mottled pig
In the blast furnace, incorporation of water vapour in the blast gives the following effect.
A Increases the reducing potential of the gas
B Increases the flame temperature
C No significant change occurs
D Increases the hydrogen content in the metal
If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called
A Bessemer pig
B Grey or foundry pig
C White or forge pig
D Mottled pig

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