| 1. | What is the process of heating and cooling for changing the structure of steel for obtaining the required properties called ? | |
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hardening
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heat treatment
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tempering
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all
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Report Question| 2. | The charge is fed into the blast furnace through the ________ ? | |
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stake
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bosh
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tuyers
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throut
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| 3. | Tempering is done at temperatures _________ ? | |
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Below critical point
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above critical point
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melting point
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none of the above
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| 4. | High temperature tempering is carried out in the temperature range of _____ ? | |
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100 - 200°c
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200 - 500°c
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700 - 900°
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900 - 1000°c
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| 5. | Pearlite stage of steel is laminated structure of the following ? | |
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austenite
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ferrite
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cementite
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ferrite & cementite
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| 6. | Tempering operation results in Mechanical properties As given below ? | |
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reduced tensile strength and hardness
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increased toughness and ductility
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both 'A' and 'B'
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none of the above
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| 7. | The process of hardening the upper surface of a carbon steel is called ? | |
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annealing
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case hardening
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tempering
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normalising
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| 8. | The process of softening and making machinable a hard and Rough metallic job by means of heat treatment is called ? | |
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annealing
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case hardening
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tempering
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normalising
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| 9. | The following heat treatment method forms decreasing carbon percentage along the thickness of the specimen toward the core ? | |
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carburizing
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nitriding
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annealing
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normalising
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