711. For light and ornamental casting, the most unsuitable pig iron, is
A. Bessemer pig
B. Grey or foundry pig
C. White or forge pig
D. Mottled pig.

712. Upto a maximum of 72% of iron, is available in
A. Magnetite
B. Red haemetite
C. Limonite
D. Siderite

713. Minimum of 40% of iron, is available in
A. Magnetite
B. Red haemetite
C. Limonite
D. Black band.

714. For melting one tonne of cast iron
A. 700 m3 air is required
B. 20 kg limestone is required
C. one quintal coke is required
D. all the above.

715. Wrought iron is manufactured from pig iron by
A. refining
B. pudding
C. shingling
D. all the above.

716. Forge pig may be converted to wrought iron by
A. rolling
B. pudding
C. shingling
D. refining.

717. During pudding
A. molten metal is kept clear of the fuel
B. carbon is converted into carbonic acid gas
C. silicon forms a slag
D. all the above.

718. Brittleness of cold is due to an excess of
A. sulphur
B. carbon
C. phosphorus
D. silicon.

719. Red short iron cracks when bent due to the presence of
A. sulphur
B. carbon
C. phosphorus
D. silicon.

720. The process of decarbonising the pig iron -completely and then adding proper percentage of carbon for manufacturing steel, is called
A. Cementation process
B. crucible process
C. Bessemer process
D. Open hearth process.

NOTE
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