Q. Mineral oils are used in the hardening process of ____________

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Q. Which quenching medium is used for quenching of carbon and low alloy steels?

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Q. Which stage of quenching is the slowest?

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Q. Vapour-jacket cooling stage of quenching process occurs _________

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Q. Non-equilibrium phases are shown for their time and transformation using _________

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Q. The CCT or the TTT diagrams are used for _________

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Q. What does CCT diagram stand for?

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Q. __________ is used to predict quenching reactions in steels.

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Q. Which of the following is not an alternative name for the TTT diagram?

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Q. The first step in constructing a TTT diagram involves _________ the sample.

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Q. Austenising of samples for TTT diagram is done __________ temperature.

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Q. Examination of transformation time after quenching is done ___________

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Q. Isothermal transformations of eutectoid steel between 723°C and 550°C produces __________ microstructure.

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Q. Rapid quenching of eutectoid steel ___________ transforms the austenite into martensite.

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Q. Hot-quenching of eutectoid steels in austenitic condition results in formation of ___________

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Q. Bainite in iron-carbon alloys has a ___________ structure.

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Q. Lower bainite is formed at ___________ temperature range.

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Q. Which of the following factors do not affect the critical cooling rate?

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Q. For hardening of steel by quenching, the steel is cooled in __________

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Q. The cooling rate must be _________ the critical cooling rate for hardening of steel by quenching.

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