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Engineering Materials

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

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

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Engineering Materials
Which of the following pipes is least corrosion resistant?

Brass
Wrought iron
Cast iron
Mild steel

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Engineering Materials
When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

Mainly ferrite
Pearlite and cementite
Ferrite and pearlite
Mainly pearlite

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Engineering Materials
The hardness is the property of a material due to which it

Can be rolled or hammered into thin sheets
Can be drawn into wires
Breaks with little permanent distortion
Can cut another metal

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

Soften material
Relieve stresses
Improve machining characteristic
Harden steel slightly

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Engineering Materials
Addition of lead and bismuth to aluminium results in

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

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