Materials and Construction

41. Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of

1. Rubber lined mild steel
2. Lead lined mild steel
3. Aluminium
4. Cast iron

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42. Acetaldehyde is shipped in _________ drums.

1. Cast iron
2. Steel
3. Aluminium
4. Either (B) & (C)

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43. Acetylene gas holder is made of

1. Copper
2. Cast iron
3. Steel
4. Monel metal

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44. Acid proof stoneware

1. Has very low strength
2. Cannot be heated
3. Is broken by small temperature changes
4. All (A), (B) and (C)

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45. Addition of _________ in steel can help in increasing the depth of hardness.

1. Nickel
2. Chromium
3. Vanadium
4. Tungsten

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46. Addition of _________ in steel is helpful in increasing the depth of hardness.

1. Chromium
2. Sulphur
3. Vanadium
4. Tungsten

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47. Addition of _________ to the steel helps in increasing the residual magnetism in steel used for making magnets.

1. Chromium
2. Nickel
3. Tungsten
4. Cobalt

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48. Addition of 2% nickel in steel makes it suitable for making

1. Electronic valves
2. Boiler plates, rivets etc.
3. Turbine blades
4. Connecting rod

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49. Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its

1. Corrosion resistance
2. Tensile strength
3. Machinability
4. Compressive strength

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50. Addition of nickel to copper improves its

1. Machinability
2. Ductility
3. Strength
4. Hardness

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