Materials and Construction

51. Addition of tungsten to steel imparts

1. Magnetic properties
2. Cutting hardness
3. Corrosion resistance
4. Ductility

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52. Age hardening is concerned with

1. Copper
2. Brass
3. Duralumin
4. Silver

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53. Alinco, which is a aluminium-cobalt-nickel steel, is used for making

1. Surgical instruments
2. Powerful magnets
3. Chemical equipments
4. Boiler tubes

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54. All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain

1. Increases very quickly
2. Decreases very quickly
3. Increases in proportion to stress
4. Decreases in proportion to stress

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55. Alpha iron is stable _________ °C.

1. Above 1403
2. Upto 910
3. Above 1800
4. Between 910 & 1403

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56. Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its

1. High strength to weight ratio
2. Low temperature strength properties
3. Its ability to be cast, rolled, forged & stamped
4. High strength and corrosion & oxidation-resistance at elevated temperature

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57. Aluminium as a material of construction suffers from the disadvantage of

1. Very high cost
2. Rather low tensile strength
3. Very low strength to weight ratio
4. Scarce availability

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58. Aluminium storage vessel can be used to store

1. Aqua regia
2. Ferrous sulphate
3. Hydrochloric acid (10%)
4. None of these

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59. Ammonium chloride solution is stored/ treated in _________ vessels/pipes.

1. Plain carbon steel
2. Stainless steel
3. Rubber or durmet-20 lined
4. Lead

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60. Among the tin containing alloys, _________ consumes the maximum amount of tin.

1. Solder
2. White metal
3. Pewter metal
4. Bronzes

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