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During carburization to obtain a twofold increase in penetration requires a __________

During carburization to obtain a twofold increase in penetration requires a __________ Correct Answer Fourfold increase in time

The thickness of a carburized layer can be calculated using the formula √(Dt). Thus, to obtain a twofold thickness either we need to make the value of D as 4D or t as 4t. So, we need a fourfold increase in time to obtain a twofold increase in penetration.

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