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Engineering Materials

Engineering Materials
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

Duralumin
Hastelloy
Invar
Silver metal

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Engineering Materials
Recrystallization temperature can be lowered by

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

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Engineering Materials
The usual composition of a soldering alloy is

Tin and lead
Tin and copper
Tin, lead and silver
Tin, lead and small percentage of antimony

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Engineering Materials
Closed packed hexagonal space lattice is found in

Zinc, magnesium, cobalt, cadmium, antimony and bismuth
Gamma-iron, aluminium, copper, lead, silver and nickel
None of these
Alpha-iron, tungsten, chromium and molybdenum

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Engineering Materials
The transistor is made of

Gold
Germanium
Silver
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
The average grain size is a minimum
There is no change in grain size

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