| 1. | Which of the following process is not a consistent of plane carbon steel in annealed condition ? | |
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ferrite
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pearlite
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cementite
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martensite
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Report Question| 2. | The cooling rate for carbon steel is in the range of ? | |
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100°c to 150°c
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200°c to 300°c
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350°c to 400°c
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450°c to 550°c
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| 3. | In nitriding process the NH3 gas is introduced at ? | |
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500 to 560°c
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575 to 600°c
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600 to 660°c
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650 to 700°c
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| 4. | A given component cracked after heat treatment, what can be the possible reasons ? | |
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it was heated long time
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it was not properly cleaned before heating
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it was suddenly cooled in brirne solution
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it was slowly cooled in air
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| 5. | The process of soaking during heat treatment is ? | |
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to quench the steel by spraying water
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to harden the outer surface of low carbon steel
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to cool the steel to room temperature in still air
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to keep the steel at the same temperature for a certain period
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| 6. | Which one of the following processes by which steel is heated to the required temperature and then cooed slowly in the furnace itself ? | |
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hardening
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tempering
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annealing
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normalising
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| 7. | Which one of the following is the solid carburizing material ? | |
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charcoal
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petrol
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ammonia
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kerosene
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| 8. | Which of the following is not a case hardening process ? | |
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carburizing
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tempering
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cyaniding
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nitriding
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| 9. | Which one of the following Which one of the following is not a case hardening process ? | |
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carburizing
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tempering
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cyaniding
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nitriding
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| 10. | liquid carburizing is carried out in a medium of _______ ? | |
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carbonaceous sodium cyanide and sodium carbonate salt bath
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carbonaceous medium such as charcoal, coke etc.
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carbonaceous gas such as methane, ethane etc.
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dissociated ammonia
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