Q. Which of the following inpurity in cast iron makes it hard and brittle?

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Q. When a low carbon steel is heated upto lower critical temperature,

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Q. Grey cast iron is __________ than white cast iron.

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Q. Corrosion resistance of steel is increased by adding nickel and chromium.

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Q. The silicon steel is widely used for

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Q. Ball bearings are, usually, made from

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Q. There are fourteen atoms in a unit cell of

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Q. The maximum internal diameter of a blast furnace is about

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Q. In spheroidising process, the steel is

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Q. Pearlite is a combination of 87% ferrite and 13% cementite.

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Q. The percentage carbon content in wrought iron is about

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Q. In the lower part of the blast furnace (zone of fusion), the temperature is

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Q. Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

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Q. Which of the following statement is wrong?

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Q. Inconel contains

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Q. In a hardening process, the hypo-eutectoid steel is

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Q. The alloying element which reduces the formation of iron sulphide in steel is

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Q. For a steel containing 0.8% carbon

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Q. In high speed steels, manganese is used to tougher the metal and to increase its

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Q. The machinability of aluminium increases when __________ is added to aluminium.

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