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Engineering Materials

Engineering Materials
Which of the following material has nearly zero coefficient of expansion?

Heat resisting steel
Stainless steel
High speed steel
Invar

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Engineering Materials
Grey cast iron has

Low compressive strength
High tensile strength
All of these
Carbon in the form of free graphite

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Engineering Materials
The defect which takes place due to imperfect packing of atoms during crystallization is known as

None of these
Line defect
Surface defect
Point defect

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Engineering Materials
Permalloy is a

Kind of stainless steel
None ferrous alloy
Nickel and iron alloy having high permeability
Polymer

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Engineering Materials
Nickel when added to copper improves

Machinability
Hardness
Hardness and strength
Strength and ductility

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

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

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