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Engineering Materials

Engineering Materials
Ball bearings are, usually, made from

Chrome steel
Low carbon steel
High carbon steel
Medium carbon steel

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Engineering Materials
Following elements have face-centered cubic structure

A iron (below 910°C and between 1400 to 1539°C), W
All of these
Mg, Zn, Ti, Zr, Br, Cd
Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt

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Engineering Materials
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

Silver metal
Hastelloy
Invar
Duralumin

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

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

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Engineering Materials
Maximum percentage of carbon in austenite is

0.008
0.00025
0.0026
0.017

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Engineering Materials
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.

Sulphur
Manganese
Phosphorus
Silicon

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