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Engineering Materials

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

Vanadium
Cobalt
Chromium
Nickel

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Engineering Materials
Gun metal contains

70% copper and 30% zinc
90% copper and 10% tin
85 - 92% copper and rest tin with little lead and nickel
70 - 78% copper and rest tin

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Engineering Materials
Which is false statement about normalizing? Normalizing is done to

Refine grain structure
Induce stresses
Reduce segregation in casting
Improve mechanical properties

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Engineering Materials
A small percentage of boron is added to steel in order to

Reduce machinability
Increase hardenability
Increase endurance strength
Increase wear resistance

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Engineering Materials
Eutectoid steel contains following percentage of carbon

0.0002
0.008
0.0063
0.003

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Engineering Materials
Acidic solution is one which has pH value

Equal to 7
pH value has nothing to do with neutral solution
Less than 7
Greater than 7

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