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
Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C.
A 250-300
B 500-750
C 950-1050
D 1400-1450
The total population of 10 countries in the Asian zone is greater than the total population of 11 countries in the European zone. What can we say if one of the countries is dropped from the Asian zone ?
A Total population of the Asian zone will still be greater than the total population of the European zone
B Total population of the European zone will be greater than the total population of the Asian zone
C Total population of both zones will be equal
D We cannot say anything conclusively
Dome temperature of blast furnace stove is most accurately measured by a
A Radiation pyrometer
B Platinum-platinum/rhodium ther-mocuple
C Iron-constantan thermocouple
D Platinum resistance thermometer
Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
A Increasing the draft in the furnace
B Preheating the fuel gas
C Oxygen enrichment of combustion air
D Preheating the combustion air
Abrasion index of blast furnace coke should be around __________ percent.
A 20
B 35
C 80
D 55
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
Which of the following combustibles is absent in blast furnace gas?
A H2
B CH4
C CO
D None of these

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