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Engineering Materials

Engineering Materials
The hardness of steel increases if it contains

Austenite
Cementite
Martensite
Pearlite

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Engineering Materials
Which of the following impurity in cast iron makes it hard and brittle?

Sulphur
Phosphorus
Silicon
Manganese

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

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

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Engineering Materials
Delta-iron occurs between the temperature ranges of

600°C to 900°C
1400°C to 1530°C
900°C to 1400°C
400°C to 600°C

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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

Atomic packing factor
None of these
Coordination number
Space lattice

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Engineering Materials
Cold rolled steel sheets contain carbon of the following order

0.001
0.006
0.002
0.004

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