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
A coarse grained steel

Is more ductile and has a less tendency to distort during heat treatment
Is less tough and has a less tendency to distort during heat treatment
Is more ductile and has a greater tendency to distort during heat treatment
Is less tough and has a greater tendency to distort during heat treatment

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Engineering Materials
Chromium in steel

Improves wear resistance, cutting ability and toughness
Improves cutting ability and reduces hardenability
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Gives ductility, toughness, tensile strength and anti-corrosion properties

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