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Engineering Materials

Engineering Materials
Hematite iron ore contains iron about

0.3
0.55
0.7
0.45

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Engineering Materials
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

Allotropic change
Recrystallization
Precipitation
Heat treatment

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Engineering Materials
The compressive strength of cast iron is __________that of its tensile strength.

More than
None of these
Equal to
Less than

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Engineering Materials
Manganese is added in low carbon steel to

Make the steel tougher and harder
Raise the yield point
Make the steel ductile and of good bending qualities
All of these

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

Surface defect
Line defect
None of these
Point defect

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Engineering Materials
A small percentage of boron is added to steel in order to

Increase wear resistance
Increase endurance strength
Increase hardenability
Reduce machinability

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