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Engineering Materials

Engineering Materials
The alloying element which can replace tungsten in high speed steels is

Vanadium
Nickel
Cobalt
Molybdenum

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Engineering Materials
Which of the following impurity in cast iron makes it hard and brittle?

Silicon
Phosphorus
Manganese
Sulphur

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Engineering Materials
Which of the following statements are true for annealing of steels?

Cooling is done slowly and steadily
Internal stresses are relieved
Steels are heated to 500 to 700°C
All of these

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Engineering Materials
Addition of lead and bismuth to aluminium results in

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

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Engineering Materials
The lower critical temperature

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

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Engineering Materials
The alloy used for making electrical resistances and heating elements is

Invar
Magnin
Nichrome
Elinvar

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