Materials and Construction

211. In cold working of metal as compared to its hot working

1. Cracks and blow holes are eliminated
2. Ductility and impact strength improves
3. Appreciable strain hardening is produced
4. Yield stress, hardness and fatigue strength is not at all affected

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212. In drop forging process, the forging is done by dropping the _________ at high velocity.

1. Hammer
2. Workpiece
3. Die with hammer
4. Weight on hammer

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213. In hot wire anemometer used for gas flow measurement, the wire is normally made of

1. Copper
2. Platinum
3. Constantan
4. Chromium

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214. In order to be called steel, an alloy should have iron percentage greater than

1. 80
2. 70
3. 90
4. 50

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215. In SO3 absorber (Contact Process), packing material used is of

1. Cast iron
2. Chemical stoneware
3. Karbate
4. Mild steel

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216. In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of

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

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217. In the Kraft (sulphate) process for the paper manufacture, the digestor is made of

1. Cast iron
2. Stainless steel
3. Karbate carbon
4. Wrought iron

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218. In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of

1. Concrete
2. Wood
3. Steel
4. Porcelain

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219. Inconel is an alloy of

1. Tin, zinc and nickel
2. Iron, nickel and chromium
3. Copper and nickel
4. Copper and tin

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220. Interchain forces are the weakest in case of

1. Plastics
2. Fibres
3. Elastomers
4. Both rubber & elastomers

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