| 1. | For best result of annealing, the heated steel piece is cooed ? | |
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slowly in the furnace itself by switching of the heat supply
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by removing the piece from the furnace and allowing it to cool in open air
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be removing the piece from the furnace and placing it under a blast of air
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by removing the piece from the furnace and dipping it in a tank container water
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Report Question| 2. | What is the name of hot steel cooled rapidly to form a new structure ? | |
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austenite
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turasite
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martensite
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perlite
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| 3. | Purpose of tempering steel is ? | |
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to regulate the hardness & toughness
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to reduce brittleness
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to relieve internal stress & strain
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all of the above
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| 4. | Pyrometer is an instrument used to measure ? | |
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low temperature
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high temperature
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low humidity
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high humidity
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| 5. | The external surface of the part made of mild steel can be hardened by ? | |
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tempering
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case hardening
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normalising
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austenite
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| 6. | upon heat treatment of carbon steel. Which one of the following will give the maximum hardness ? | |
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normalising
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tempering
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quenching after austenitising
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annealing
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| 7. | Which one of the following heat treatment processes produces a scale free surface on the component ? | |
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flame hardening
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case hardening
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induction hardening
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nitriding
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| 8. | The process of heating steel to about 40°c above the upper critical temperature and cooling it in still air to room temperature is known as ? | |
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normalising
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tempering
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hardening
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annealing
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| 9. | Which of the following quenching diameter is used for hardening high speed steel tool ? | |
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water
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brine solution
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oil
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soda water
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| 10. | Which one of the following processes is adapted to improve the internal structure of steel. Which has been subject to severe hammering ? | |
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hardening
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tempering
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annealing
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normalising
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