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Engineering Materials

Engineering Materials
Preheating is essential in welding

All of these
Cast iron
All nonferrous materials
High speed steel

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Engineering Materials
Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron
Copper, nickel and antimony
Iron, zinc and bismuth
Nickel, copper and zinc

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Engineering Materials
Ferromagnetic alpha iron exists in temperature range of

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

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Engineering Materials
The aluminium alloy, mainly used, for anodized utensil manufacture, is

Y-alloy
Hindalium
Magnalium
Duralumin

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Engineering Materials
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

Hypoeutectic cast irons
Hypereutectic cast irons
None of these
Eutectic cast irons

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Engineering Materials
Cold rolled steel sheets contain carbon of the following order

0.002
0.006
0.004
0.001

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