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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
Nickel
Chromium
Cobalt

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Engineering Materials
Which is false statement about annealing? Annealing is done to

Relieve stresses
Soften material
Harden steel slightly
Improve machining characteristic

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Engineering Materials
Addition of manganese to aluminium results in

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

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Engineering Materials
Foundry crucible is made of

Lead
Graphite
Mild steel
German silver

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Engineering Materials
Lead is poured into the joint between two pipes. These pipes may be made of

Vitrified clay
Concrete
Cast iron
Asbestos cement

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Engineering Materials
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

Suddenly in a suitable cooling medium
Any one of these
In still air
Slowly in the furnace

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