232. Stainless steel contains
A.Chromium, iron and nickel
B.Chromium and nickel
C.Iron and carbon
D.Chromium, nickel, iron and carbon

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233. Billets are
A.Obtained from solidification of molten metal into moulds
B.Obtained by passing hot ingots through the rolling mills and are of size 150 mm x 150 mm to 350 mm x 350 mm
C.Obtained by further rolling and are of size 50 mm x 50 mm to 125 mm x 125 mm
D.Scraps from unused blooms

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234. Oxygen lance in open hearth furnace is used to
A.Measure O2 content
B.Remove O2
C.Introduce O2 in furnace
D.Maintain O2 at a constant value

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235. As the impurities are oxidised, the melting point of iron
A.Increases
B.Decreases
C.Remains same
D.Depends on the type of furnace used

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236. Following etching solution is used for low-carbon steel and welds
A.Nital - 2% HNO3 in ethyl alcohol
B.Picral - 5% picric acid and ethyl alcohol
C.1% hydrofluoric acid in water
D.50% NH4OH and 50% water

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237. In making high silicon content steel, scrap can be used
A.To form slag
B.As catalyst
C.To control grade
D.As coolant

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238. In making high silicon content steel, scrap can be used
A.To form slag
B.As catalyst
C.To control grade
D.As coolant

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