| 1. | The brown smoke during the operation of a bessemer converter indicates that the ? | |
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air is burning out silicon and managanese
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silicon and manganese has burnt and carbon has started oxidising
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the converter must be titled to remove the contents of the converter
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the brown smoke does not occur during the operation of a bessemer converter
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Report Question| 2. | The alloying element which can replace tungsten in high speed steels is ? | |
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nickel
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vanadium
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cobalt
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molybdenum
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| 3. | The heat treatment process used for softening hardened steel is ? | |
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carburising
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normalising
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annealing
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tempering
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| 4. | Babbit metal is a ? | |
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lead-base alloy
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copper-base alloy
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tin-base alloy
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cadmium-base alloy
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| 5. | The blade of a power saw is made of ? | |
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boron steel
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high speed steel
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stainless steel
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malleable cast iron
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| 6. | An eutectoid steel consists of ? | |
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wholly pearlite
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wholly austenite
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pearlite and ferrite
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pearlite and cementite
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| 7. | Cast iron is manufactured in ? | |
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blast furnace
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cupola
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open hearth furnace
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bessemer converter
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| 8. | The material in which the atoms are arranged chaotically, is called ? | |
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amorphous material
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mesomorphous material
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crystalline material
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none of these
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| 9. | The process in which carbon and nitrogen both are absorbed by the metal surface to get it hardened is known as ? | |
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carburising
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cyaniding
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flame hardening
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induction hardening
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| 10. | The machine tool guide ways are usually hardened by ? | |
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vacuum hardening
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martempering
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induction hardening
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flame hardening
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