701. The operation of removal of impurities or clay adhering to iron ores, is known as
A. dressing
B. calcinations
C. roasting
D. smelting.

702. Calcination of iron ores is done
A. to remove moisture
B. to remove carbonic acid
C. by roasting in heaps
D. all the above.

703. If the iron ore contains clay as an impurity, the flux added during calcination, is
A. clay
B. lime stone
C. argillaceous iron ore
D. all the above.

704. If the ore impurities is
A. clay, lime stone is used as flux
B. lime stone, clay is used as flux
C. quartz, lime stone and argallaceous iron ores are used as flux
D. All the above.

705. During smelting process, the combination of fuel in the furnace
A. forms carbon dioxide
B. carbon dioxide with carbon forms carbon mono-oxide
C. carbon mono-oxide reacts with Fe203 to form iron and liberates CO2
D. all the above.

706. Pig iron made from heamatite 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

707. Pig iron obtained from the furnance which is properly provided with fuel at a very high temperature, is called
A. Bessemer pig
B. Grey or foundry pig
C. White or forge pig
D. Mottled pig

708. 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.

709. The variety of pig iron used for the manufacture of steel by Bessemer process, is
A. Bessemer pig
B. Grey pig
C. White forge pig
D. Mottled pig.

710. The variety of pig iron used for manufacture of wrought iron, is
A. Bessemer pig
B. Grey or foundry pig
C. White forge pig
D. Mottled pig.

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