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Engineering Materials

Engineering Materials
Which of the following property is desirable for materials used in tools and machines?

Malleability
Ductility
Plasticity
Elasticity

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Engineering Materials
Gamma iron exits at following temperature

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

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Engineering Materials
Steel with __________ carbon is known as hypo-eutectoid steel.

None of these
Below 0.8%
0.008
Above 0.8%

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Engineering Materials
Dislocations in materials refer to the following type of defect

Line defect
Plane defect
Volumetric defect
Point defect

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Engineering Materials
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

Any one of these
In still air
Slowly in the furnace
Suddenly in a suitable cooling medium

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Engineering Materials
When low carbon steel is heated up to upper critical temperature

The average grain size is a minimum
The grain size increases very rapidly
The grain size first increases and then decreases very rapidly
There is no change in grain size

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