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Engineering Materials

Engineering Materials
Ferromagnetic alpha iron exists in temperature range of

Below 723°C
910 to 1440°C
770 to 910°C
1400 to 1539°C

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Engineering Materials
An example of amorphous material is

Lead
Silver
Glass
Zinc

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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 average grain size is a minimum
The grain size first increases and then decreases very rapidly
The grain size increases very rapidly

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Engineering Materials
Iron ore is usually found in the form of

Sulphides
Carbonates
All of these
Oxides

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Engineering Materials
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

Silver metal
Invar
Hastelloy
Duralumin

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Engineering Materials
Gamma iron exits at following temperature

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

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