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Engineering Materials

Engineering Materials
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

Silicon
Manganese
Phosphorus
Sulphur

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Engineering Materials
Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio

30 : 70
40 : 60
2.9375
2.1180555555556

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Engineering Materials
Preheating is essential in welding

All of these
Cast iron
High speed steel
All nonferrous materials

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Engineering Materials
The steel widely used for motor car crankshafts is

Silicon steel
Nickel steel
Nickel-chrome steel
Chrome steel

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Engineering Materials
The property of a material which enables it to retain the deformation permanently, is called

Ductility
Malleability
Brittleness
Plasticity

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Engineering Materials
Addition of manganese to aluminium results in

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

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