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Engineering Materials

Engineering Materials
Hardness of upper bainite (acicular structure) is about

RC 48
RC 80
RC 65
RC 57

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Engineering Materials
Eutectoid steel contains following percentage of carbon

0.0002
0.003
0.008
0.0063

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

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Engineering Materials
Basic solution is one which has pH value

Greater than 7
pH value has nothing to do with basic solution
Less than 7
Equal to 7

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Engineering Materials
Delta iron occurs at temperature of

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

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Engineering Materials
Addition of copper to aluminium results in

Improvement of corrosion resistance
Improving machinability
Improvement of casting characteristics
One of the best known age and precipitation hardening systems

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