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Engineering Materials

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

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

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Engineering Materials
When low carbon steel is heated up to lower critical temperature

There is no change in grain size
The grain size increases very rapidly
The grain size first increases and then decreases very rapidly
The average grain size is a minimum

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Engineering Materials
Bronze contains

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

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Engineering Materials
Bell metal contains

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

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Engineering Materials
When medium carbon steel is heated to coarsening temperature

The grain size increases very rapidly
The average grain size is a minimum
The grain size first increases and then decreases very rapidly
There is no change in grain size

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Engineering Materials
The percentage of carbon in low carbon steel is

0.3%
0.5%
0.05%
0.15%

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