Q. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

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Q. Nodular cast iron is produced by adding __________ to the molten cast iron.

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Q. Free carbon in iron makes the metal

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Q. The cupola is used to manufacture

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Q. The type of space lattice found in gamma-iron is

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Q. The property of a material due to which it breaks with little permanent distortion, is called

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Q. The ability of a material to absorb energy in the plastic range is called

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Q. Brass is an alloy of

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Q. A material is said to be allotropic, if it has

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Q. Closed packed hexagonal space lattice is found in

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Q. The hardness and tensile strength in austenitic stainless steel can be increased by

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Q. Iron ore is, usually, found in the form of

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Q. The hardness of steel increases if it contains

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Q. In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled

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Q. Ferrite and pearlite makes the steel soft and ductile.

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Q. The lower critical temperature

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Q. The quenching of steel from the upper critical point results in a fine grained structure.

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Q. An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

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Q. Which of the following has a fine gold colour and is used for imitation jewellery?

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Q. When the steel is normalised, its

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