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Engineering Materials

Engineering Materials
Super conduction by metals is observed in the temperature range of

Above 100°K
Below 10°K
Around 0°C
Around 100°C

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Engineering Materials
The defect which takes place due to imperfect packing of atoms during crystallization is known as

Surface defect
Line defect
None of these
Point defect

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Engineering Materials
Cupola produces following material

Cast iron
Wrought iron
Pig iron
Malleable iron

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Engineering Materials
Recrystallization temperature can be lowered by

All of these
Purification of metal
Grain refinement
Working at lower temperature

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Engineering Materials
White metal contains

Silver and chromium
88% copper and 10% tin and rest zinc
Alloy of tin, lead and cadmium
63 to 67% nickel and 30% copper

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Engineering Materials
When low carbon steel is heated up to upper critical temperature

The grain size first increases and then decreases very rapidly
The grain size increases very rapidly
There is no change in grain size
The average grain size is a minimum

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