Q. During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising.

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Q. The casting ability of aluminium increases when __________ is added to aluminium.

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Q. Manganese bronze has

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Q. A steel is heated at about 875° C where the structure consists of entirely austenite. It is then cooled suddenly at a temperature of about 250° C to 525° C. This process of heat treatment is known as

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Q. Silicon bronze contains

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Q. In acidic bessemer process, the furnace is lined with

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Q. Micro-structure of a material is, generally, examined by

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Q. The addition of magnesium to cast iron increases its

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Q. Killed steels

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Q. The slow cooling of steel from the __________ results in a coarse grained structure.

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Q. Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from austenitic state?

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Q. The catalysts are used to accelerate the chemical reaction during the process of ploymerisation of plastics.

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Q. Muntz metal (Yellow brass) contains

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Q. Which of the following gives the correct order of increasing hot hardness of cutting tool materials?

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Q. The slag from the blast furnace

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Q. Which of the following is a mesomorphous material?

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Q. In the middle part of the blast furnace (zone of absorption), the temperature is

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Q. The temperature in the upper part of the blast furnace (zone of reduction) is __________ that of the middle part.

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Q. The temperature point at which the change starts on heating the steel is called

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Q. Aluminium bronze has high resistance to corrosion.

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