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Q.

Tempering of steel

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a

Increases mechanical strength

b

Changes ratio of iron in steel

c

Involves heating the steel to appropriate temperature and then cooling it rapidly

d

Decreases mechanical strength

answer is A.

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Detailed Solution

tempering, in metallurgy, process of improving the characteristics of a metal, especially steel, by heating it to a high temperature, though below the melting point, then cooling it, usually in air. The process has the effect of toughening by lessening brittleness and reducing internal stresses
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Tempering of steel