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Engineering Materials

Engineering Materials
Nickel when added to copper improves

Strength and ductility
Machinability
Hardness and strength
Hardness

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Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points where there is no further flow of metal
The points of discontinuity
The points where no further change occurs
Constant for all metals

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Engineering Materials
According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is

0.4 to 0.6%
0.35 to 0.45%
0.0004
0.6 to 0.8%

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Engineering Materials
The strength is the ability of a material to resist

Fracture due to high impact loads
Externally applied forces with breakdown or yielding
Deformation under stress
None of these

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Engineering Materials
The purpose of heat treatment is to

Any one of these
Modify the structure of the material
Change grain size
Relieve the stresses set up in the material after hot or cold working

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Engineering Materials
Sulphur in cast iron

Aids fusibility and fluidity
Increases hardness and brittleness
Makes the iron soft and easily machinable
Make the iron white and hard

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