Case hardening is not done by________________?
Correct answer: D. Both 'B' & 'C'
- A. Nitriding
- B. Hot dipping
- C. Electroplating
- D. Both 'B' & 'C'
Explanation
Nitriding is a recognized case-hardening treatment because nitrogen diffuses into the surface and forms hard compounds. Hot dipping and electroplating produce surface coatings rather than true case hardening, so both B and C fit the question.
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