Engineering Materials
Perminvar alloy having constant permeability is an alloy of

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

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Engineering Materials
Cyaniding is the process of

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

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Engineering Materials
The brown smoke during the operation of a Bessemer converter indicates that the

Silicon and manganese has burnt and carbon has started oxidizing
The converter must be titled to remove the contents of the converter
The brown smoke does not occur during the operation of a Bessemer converter
Air is burning out silicon and manganese

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