Engineering Materials
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.

Free graphite
None of these
Both A and B
Cementite

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Engineering Materials
Cyaniding is the process of

Dipping steel in cyanide bath
Obtaining cyanide salts
Reacting steel surface with cyanide salts
Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness

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