Materials and Construction

231. Lead pipe is

1. Especially resistant to solutions containing H2SO4
2. Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
3. Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
4. All (A), (B) and (C)

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232. Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by

1. Dilute HCI
2. Acetic acid
3. Concentrated H2SO4
4. None of these

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233. Wrought iron is a suitable material of construction for handling _________ solutions.

1. Dilute acidic
2. Concentrated acidic
3. Alkalis & alkaline
4. None of these

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234. Light weight metallic alloy used in aircraft industry is

1. Aluminium
2. High silicon (14%) iron
3. Duralumin
4. Phosphor bronze

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235. Liners of a ball mill are never made of

1. Lead
2. Alloy steel
3. Rubber or ceramic material
4. Cast iron

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236. Liquid ammonia is shipped in _________ containers.

1. Steel
2. Aluminium
3. Glass
4. Lead lined

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237. Locomotive boiler tubes are made of _________ alloys.

1. Arsenic copper
2. Magnesium
3. Aluminium
4. Nickel

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238. Low carbon steels are those in which carbon percentage is around

1. 0.1 to 0.35
2. 0.4 to 0.7
3. 0.8 to 1.5
4. 1.5 to 2

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239. Manganese in steel affects its

1. Ductility
2. Tensile strength
3. Hardness
4. None of these

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240. Material of construction of pipe generally used for conveying water in India is

1. Stainless steel
2. Cast iron
3. Wrought iron
4. Lead lined steel

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