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Question

The process of heating and suddenly cooling of steel is known as :

A
Tempering
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B
Annealing
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C
Hardening
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D
Quenching
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Solution

The correct option is D Quenching
The process of heating and suddenly cooling of steel is known as quenching.
Quenching or hardening is a process of heating steel to redness followed by sudden cooling by plunging the red hot steel into water or oil.

Hence, the correct option is (D)

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