| 1. | Nickel when added to copper improves ? | |
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machinability
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hardness
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hardness and strength
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strength and ductility
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Report Question| 2. | When the steel is normalised, its ? | |
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yield point increases
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ductility decreases
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ultimate tensile strength increases
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all of these
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| 3. | The presence of hydrogen in steel causes ? | |
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reduced neutron absorption cross-section
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improved weldability
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embrittlement
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corrosion resistance
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| 4. | Grey cast iron has ? | |
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carbon in the form of free graphite
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high tensile strength
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low compressive strength
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all of these
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| 5. | Which one of the following sets of constituents is expected in equilibrium cooling of a hyper eutectoid steel from austenitic state ? | |
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Ferrite and pearlite
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Cementite and pearlite
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Ferrite and bainite
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Cementite and martensite
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| 6. | Steel containing 0.8 to 1.5% carbon, is known as ? | |
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mild steel
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dead mild steel
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medium carbon steel
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high carbon steel
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| 7. | Iron ore is, usually, found in the form of ? | |
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oxides
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carbonates
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sulphides
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all of these
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| 8. | When a steel containing more than 0.8% carbon is cooled slowly below the lower critical point, it consists of ? | |
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mainly pearlite
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mainly ferrite
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ferrite and pearlite
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pearlite and cementite
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| 9. | Haematite iron ore contains iron about ? | |
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30%
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45%
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55%
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70%
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| 10. | Chilled cast iron is produced ? | |
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by adding magnesium to molten cast iron
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by quick cooling of molten cast iron
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from white cast iron by annealing process
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none of these
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