Q. Nitriding steels are tempered at about ________

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Q. Flame hardening can only be performed on steels with a minimum of ______ carbon.

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Q. How is the heating of surface done in flame hardening technique?

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Q. Flame hardening technique is suitable for ____________

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Q. Which of the following is an application for flame hardening?

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Q. How does induction hardening differ from flame hardening?

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Q. What is the frequency used for depths of 2 to 3 mm in induction hardening?

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Q. Which of the following is true for induction hardening?

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Q. What is the hardness achieved by flame hardening?

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Q. ___________ is a method of obtaining diverse properties by varying thermal histories of various regions.

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Q. The welding process in which no filler metal is used is classified as ___________

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Q. The pressure of acetylene in welding torch for oxy-acetylene welding is maintained at _________

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Q. What is the color of an acetylene cylinder in case of gas welding?

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Q. What is the temperature of arc needed for arc welding?

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Q. A small depression formed in the parent metal is called _________

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Q. What is the level of efficiency of a transformer as a welding machine?

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Q. Which electrode material is used for welding of wrought iron?

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Q. Which electrode material is used for welding of carbon steel?

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Q. ___________ is used as an inert gas for metal inert gas welding.

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Q. Which electrode is used in the process of TIG welding?

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