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Engineering Materials

Engineering Materials
The percentage of carbon in grey iron castings usually varies between

0.5 to 1%
5 to 7%
0.012
2.5 to 4.5%

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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
None of these
Space lattice
Atomic packing factor

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Engineering Materials
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

40 : 30 : 20 : 10
50 : 20 : 20 : 10
30 : 20 : 30 : 20
50 : 20 : 10 : 20

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Engineering Materials
Nodular iron has

All of these
High tensile strength
Low melting point
High machinability

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Engineering Materials
Which is false statement about normalizing? Normalizing is done to

Induce stresses
Improve mechanical properties
Reduce segregation in casting
Refine grain structure

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Engineering Materials
Tungsten in high speed steel provides

Wear resistance
Sharp cutting edge
Hot hardness
Toughness

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