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Engineering Materials

Engineering Materials
Super conduction by metals is observed in the temperature range of

Below 10°K
Around 100°C
Around 0°C
Above 100°K

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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
Which of the following material has maximum ductility?

Aluminium
Nickel
Mild steel
Copper

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Engineering Materials
The lower critical temperature

Is same for all steels
Increases as the carbon content in steel increases
Decreases as the carbon content in steel increases
Depends upon the rate of heating

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Engineering Materials
The percentage of carbon in low carbon steel is

0.5%
0.3%
0.15%
0.05%

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Engineering Materials
Gamma iron exits at following temperature

Between 1400°C and 1539°C
Between 910°C and 1400°C
Room temperature
Near melting point

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