Engineering Materials
Brass contains

70% copper and 30% zinc
70 - 75% copper and rest tin
85 - 92% copper and rest tin with little lead and nickel
90% copper and 10% tin

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Engineering Materials
Cyaniding is the process of

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

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Engineering Materials
Pick up wrong statement about wrought iron

It is very soft and ductile
It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
It melts at 1535°C
It contains carbon of the order of 0 to 0.25%

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Engineering Materials
A coarse grained steel

Is more ductile and has a less tendency to distort during heat treatment
Is less tough and has a less tendency to distort during heat treatment
Is less tough and has a greater tendency to distort during heat treatment
Is more ductile and has a greater tendency to distort during heat treatment

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