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Engineering Materials

Engineering Materials
The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

Chromium
Nickel
Vanadium
Cobalt

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Engineering Materials
Mild steel belongs to the following category

Low carbon steel
High carbon steel
Alloy steel
Medium 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
Brass contains

70% copper and 30% zinc
70 - 75% copper and rest tin
90% copper and 10% tin
85 - 92% copper and rest tin with little lead and nickel

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Engineering Materials
Addition of lead and bismuth to aluminium results in

Improving machinability
One of the best known age and precipitation hardening systems
Improvement of corrosion resistance
Improvement of casting characteristics

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Engineering Materials
The lower critical temperature

Depends upon the rate of heating
Decreases as the carbon content in steel increases
Increases as the carbon content in steel increases
Is same for all steels

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MORE MCQ ON Engineering Materials

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