Related Questions

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
Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
A 20
B 40
C 60
D 80
Operation of blast furnace stove is based on the principles of a __________ furnace.
A Regenerative
B Recuperative
C Both A and B
D Neither A nor B
The charge of the blast furnace consists of
A Calcined ore (8 parts), coke (4 parts) and limestone (1 part)
B Calcined ore (4 parts), coke (1 part) and limestone (8 parts)
C Calcined ore (1 part), coke (8 parts) and limestone (4 parts)
D Calcined ore, coke and limestone all in equal parts
The main charge in blast furnace is usually
A Iron ore & coke
B Iron ore, coke & air
C Limestone, coke & iron ore
D Limestone, sand & iron ore
Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?
A Sinter
B Coke
C Iron ore
D Limestone
The coke in the charge of blast furnace
A Controls the grade of pig iron
B Acts as an iron bearing mineral
C Supplies heat to reduce ore and melt the iron
D Forms a slag by combining with impurities
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
A Resistance
B Arc
C Low frequency induction
D None of these
Most of the phosphorous present in the blast furnace burden enters into
A Hot metal
B Flue gases
C Slag
D Refractory lining
A uniformly loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is
A One-fourth
B One-third
C One-half
D Twice

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