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Engineering Materials

Engineering Materials
Which of the following material has nearly zero coefficient of expansion?

Invar
High speed steel
Heat resisting steel
Stainless steel

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Engineering Materials
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

Coordination number
Atomic packing factor
None of these
Space lattice

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Engineering Materials
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

Any one of these
In still air
Slowly in the furnace
Suddenly in a suitable cooling medium

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Engineering Materials
Blast furnace produces following by reduction of iron ore

Malleable iron
Wrought iron
Cast iron
Pig iron

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Engineering Materials
Ferromagnetic alpha iron exists in temperature range of

770 to 910°C
Below 723°C
910 to 1440°C
1400 to 1539°C

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Engineering Materials
Dye penetrant method is generally used to locate

Core defects
Surface defects
Temporary defects
Superficial defects

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