Related Questions

The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is
A 770°C
B 910°C
C 1050°C
D Below recrystallization temperature
Paramagnetic alpha iron changes to gamma iron at
A 770°C
B 912°C
C 1440°C
D 1539°C
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if
A The gain is increased beyond upper critical value
B The gain is decreased below lower critical value
C Both A and B
D None of the above
Ferromagnetic alpha iron exists in temperature range of
A Below 723°C
B 770 to 910°C
C 910 to 1440°C
D 1400 to 1539°C
The crystal of alpha iron is
A Body centered cubic
B Face centered cubic
C Hexagonal close packed
D Cubic structure
The type of space lattice found in alpha-iron is
A Face centered cubic space lattice
B Body centered cubic space lattice
C Close packed hexagonal space lattice
D None of these
__________ iron is produced by the annealing of white cast iron.
A Malleable
B Nodular
C Ductile
D Grey
__________ iron is produced, when molten pig iron is allowed to cool gradually.
A White cast
B Grey cast
C Wrought
D None of these
__________ iron is produced, when molten pig iron is chilled suddenly.
A White cast
B Grey cast
C Wrought
D None of these
Iron content in Indian iron ore is about __________ percent.
A 80-85
B 60-65
C 40-45
D 20-25

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