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Engineering Materials

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

None of these
Surface defect
Line defect
Point defect

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Engineering Materials
Free cutting steels

Is used where rapid machining is the prime requirement
Can be cut freely
Contain carbon in free from
Require minimum cutting force

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Engineering Materials
The following element can't impart high strength at elevated temperature

Manganese
Magnesium
Nickel
Silicon

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Engineering Materials
An engineer's hammer is made of

Forged steel
Cast iron
Mild steel
High carbon steel

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Engineering Materials
The purpose of heat treatment is to

Modify the structure of the material
Any one of these
Change grain size
Relieve the stresses set up in the material after hot or cold working

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Engineering Materials
The percentage of carbon in grey iron castings usually varies between

2.5 to 4.5%
0.5 to 1%
0.012
5 to 7%

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