Materials and Construction

11. _________ is added in low carbon steel to raise its yield point.

1. Sulphur
2. Phosphorous
3. Silicon
4. Manganese

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12. _________ is added in stainless steel to prevent inter crystal corrosion.

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

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13. _________ is never shipped in glass carboys.

1. Ammonia
2. Acetic acid
3. Phenol
4. Formaldehyde

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14. _________ is not a case hardening process.

1. Carburising
2. Nitriding
3. Cyaniding
4. Annealing

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15. _________ is used for determining the tensile strength of steels.

1. Hydraulic press
2. Universal testing machine
3. Mechanical press
4. None of these

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16. _________ is used for examining the macro-structure of a material.

1. Metallurgical microscope
2. Optical microscope
3. X-rays
4. Visual inspection by naked eye

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17. _________ moulding process cannot be used for thermoplastic plastics.

1. Compression
2. Extrusion
3. Injection
4. None of these

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18. _________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.

1. Solid solution hardening
2. Screw dislocation
3. Strain ageing
4. Twinning

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19. _________ possesses viscoelastic properties.

1. Cork
2. Glass
3. Graphite
4. Rubber

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20. _________ steel is widely used for the manufacture of motor car crankshafts.

1. Silicon
2. Nickel
3. Chrome
4. High speed

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