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

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

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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.

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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.

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194. Wrought iron contains carbon upto
A.0.15%
B. 1.03i
C.1.50%
D. 2%.

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

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

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