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Engineering Materials

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

Duralumin
Invar
Hastelloy
Silver metal

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Engineering Materials
White cast iron contains carbon in the form of

Cementite
Graphite
Free carbon
White carbon

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Engineering Materials
The toughness of a material __________ when it is heated.

None of these
Decreases
Remain same
Increases

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Engineering Materials
Preheating is essential in welding

All of these
High speed steel
Cast iron
All nonferrous materials

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Engineering Materials
Constantan an alloy used in thermocouples is an alloy of

Copper and zinc
Copper and nickel
Copper and tin
Copper and iron

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

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

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