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Engineering Materials

Engineering Materials
The ability of a material to resist softening at high temperature is known as

Creep
Hot hardness
Fatigue
Hot tempering

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Engineering Materials
Hardness of martensite is about

RC 65
RC 48
RC 80
RC 57

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

Surface defect
None of these
Point defect
Line defect

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Engineering Materials
Ball bearings are, usually, made from

High carbon steel
Chrome steel
Low carbon steel
Medium carbon steel

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Engineering Materials
Recrystallization temperature can be lowered by

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

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Engineering Materials
The main alloying elements high speed steel in order of increasing proportion are

Vanadium, chromium, tungsten
Tungsten, titanium, vanadium
Tungsten, chromium, titanium
Chromium, titanium, vanadium

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