190. Upto a maximum of 72% of iron, is available in
A. Magnetite
B. Red haemetite
C. Limonite
D. Siderite
191. Minimum of 40% of iron, is available in
A. Magnetite
B. Red haemetite
C. Limonite
D. Black band.
192. Cast iron
A. is obtained by purifying pig iron
B. is manufactured in required shapes
C. may contain 2 to 5 per cent of carbon with other impurities
D. all the above.
193. 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.
194. Wrought iron contains carbon upto
A.0.15%
B. 1.03i
C.1.50%
D. 2%.
195. Wrought iron is manufactured from pig iron by
A. refining
B. pudding
C. shingling
D. all the above.
196. Forge pig may be converted to wrought iron by
A. rolling
B. pudding
C. shingling
D. refining.
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