Engineering Materials
Perminvar alloy having constant permeability is an alloy of

Copper, nickel and antimony
Nickel, copper and zinc
Nickel, copper and iron
Iron, zinc and bismuth

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Engineering Materials
Smelting is the process of

Reducing the ore with carbon in the presence of a flux
Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
Removing the impurities like clay, sand etc. from the iron ore by washing with water
All of these

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Engineering Materials
Cyaniding is the process of

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

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