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Engineering Materials

Engineering Materials
The bond formed by transferring electrons from one atom to another is called

Metallic bond
Ionic bond
Covalent bond
None of these

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Engineering Materials
Steel made from phosphate iron is

Hard
Tough
Brittle
Ductile

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Engineering Materials
Age hardening is related to

Silver
Duralumin
Copper
Brass

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Engineering Materials
Perminvar alloy having constant permeability is an alloy of

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

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Engineering Materials
Brass contains

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

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Engineering Materials
Which of the following statements are true for annealing of steels?

Cooling is done slowly and steadily
Steels are heated to 500 to 700°C
All of these
Internal stresses are relieved

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