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Engineering Materials

Engineering Materials
A cold chisel is made of

H.S.S.
Mild steel
High carbon
Cast iron

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Engineering Materials
Pig iron is the name given to

Iron in molten form in the ladles
Raw material for blast furnace
Iron containing huge quantities of carbon
Product of blast furnace made by reduction of iron ore

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Engineering Materials
Which is false statement about tempering? Tempering is done to

Improve machinability
Improve ductility
Release stresses
Improve toughness

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Engineering Materials
The ratio of the volume occupied by the atoms to the total volume of the unit cell is called

Atomic packing factor
None of these
Space lattice
Coordination number

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Engineering Materials
In malleable iron, carbon is present in the form of

Free carbon
Flakes
Nodular aggregates of graphite
Cementite

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

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

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