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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