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Engineering Materials

Engineering Materials
Maximum percentage of carbon in ferrite is

0.0006
0.00025
0.001
0.0025

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Engineering Materials
Addition of lead and bismuth to aluminium results in

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

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

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

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Engineering Materials
Hardness of martensite is about

RC 48
RC 65
RC 80
RC 57

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Engineering Materials
When medium carbon steel is heated to coarsening temperature

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

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Engineering Materials
When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces

Alloy cast iron
White cast iron
Nodular cast iron
Malleable cast iron

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