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Engineering Materials

Engineering Materials
The elastic stress strain behavior of rubber is

Nonlinear
No fixed relationship
Linear
Plastic

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Engineering Materials
Hematite iron ore contains iron about

0.7
0.55
0.3
0.45

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Engineering Materials
Crystal structure of a material is, generally, examined by

Metallurgical microscope
X-ray techniques
Naked eye
Optical microscope

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Engineering Materials
Recrystallization temperature can be lowered by

Grain refinement
All of these
Purification of metal
Working at lower temperature

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Engineering Materials
Maximum percentage of carbon in ferrite is

0.0025
0.00025
0.001
0.0006

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Engineering Materials
The machinability of steel is improved by adding

Nickel and chromium
Sulphur, lead and phosphorus
Chromium
Nickel

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