Q. The essential constituent of a hardened steel is

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Q. The cutting tools are made from

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Q. The maximum solubility of carbon in austenite is 1.7% at 1130° C.

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Q. In a close packed hexagonal space lattice, there are

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Q. Which of the following iron exists at 910° C?

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Q. The iron ore mostly used for the production of pig iron is

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Q. A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to

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Q. The steel widely used for making precision measuring instruments is

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Q. The ductility is the property of a material due to which it

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Q. The malleability is the property of a material due to which it can be rolled or hammered into thin sheets.

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Q. The process of inducing carbon to __________ carbon steels in order to give it a hard surface is known as carburising.

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Q. Which of the following solids are malleable and ductile?

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Q. The delta-iron possesses a body centred cubic space lattice.

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Q. Thermosetting plastics are those materials which

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Q. Silicon is added in low carbon steels to

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Q. According to Indian standard specifications, cast iron designated by 'FG 150' means

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Q. The red flame during the operation of a bessemer converter indicates that the

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Q. Phosphor bronze has

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Q. In the austempering process of heat treatment, austenite changes into

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Q. Iron-carbon alloys containing 4.3% carbon are known as hypo-eutectic cast irons.

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