| 1. | The type of space lattice found in alpha-iron is ? | |
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face centred cubic space lattice
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body centred cubic space lattice
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close packed hexagonal space lattice
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none of these
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Report Question| 2. | Smelting is the process of ? | |
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removing the impurities like clay, sand etc. from the iron ore by washing with water
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expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
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reducing the ore with carbon in the presence of a flux
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all of the above
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| 3. | Combined carbon in iron makes the metal ? | |
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soft and gives coarse grained crystalline structure
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soft and gives a fine grained crystalline structure
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hard and gives a coarse grained crystalline structure
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hard and gives a fine grained crystalline structure
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| 4. | The ability of a material to absorb energy in the plastic range is called ? | |
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resilience
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creep
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fatigue strength
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toughness
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| 5. | Which of the following metal shrinks most from molten state to solid state ? | |
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Cast iron
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Cast steel
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Brass
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Admirality metal
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| 6. | The fuel used in a blast furnace is ? | |
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coal
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coke
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wood
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producer gas
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| 7. | Silicon 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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| 8. | When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces ? | |
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white cast iron
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nodular cast iron
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malleable cast iron
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alloy cast iron
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| 9. | In spheroidising process, the steel is ? | |
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heated below the lower critical temperature and then cooled slowly
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heated upto the lower critical temperature and then cooled in still air
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heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600? C
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none of the above
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| 10. | The ability of a material to resist fracture due to high impact loads, is called ? | |
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strength
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stiffness
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toughness
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brittleness
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